In re The Application Of The Gas Company, LLC dba Hawaii Gas For Approval Of Rate Increases And Revised Rate Schedules And Rules. ( 2020 )


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  • **   FOR PUBLICATION IN WEST’S HAWAIʻI REPORTS AND PACIFIC REPORTER        **
    Electronically Filed
    Supreme Court
    SCOT-XX-XXXXXXX
    09-JUN-2020
    08:43 AM
    IN THE SUPREME COURT OF THE STATE OF HAWAIʻI
    ---oOo---
    ________________________________________________________________
    IN THE MATTER OF THE APPLICATION OF THE GAS COMPANY, LLC
    dba HAWAII GAS FOR APPROVAL OF RATE INCREASES AND
    REVISED RATE SCHEDULES AND RULES
    ________________________________________________________________
    APPEAL FROM THE PUBLIC UTILITIES COMMISSION
    (Agency Appeal)
    SCOT-XX-XXXXXXX
    JUNE 9, 2020
    RECKTENWALD, C.J., NAKAYAMA, McKENNA, AND POLLACK, JJ.1
    OPINION OF THE COURT BY McKENNA, J.
    I.   Introduction
    In this appeal, Life of the Land and Hui Aloha ʻĀina o Ka
    Lei Maile Aliʻi (“LOL” and “KLM,” respectively, or sometimes
    1     Pursuant to Hawaiʻi Revised Statutes (“HRS”) § 602-10 (2016), titled
    “Full court; oral argument; substitute justices,” the parties before this
    court “shall be entitled to consideration by a full court.” Further, under
    that statute, “Oral argument shall be before a full court. . . .” “After
    oral argument of a case,” however, “if a vacancy arises or if for any other
    reason a justice is unable to continue on the case, the case may be decided
    or disposed of upon the concurrence of any three members of the court without
    filling the vacancy or the place of such justice.” The full court
    (consisting of Chief Justice Recktenwald and Justices Nakayama, McKenna,
    Pollack, and Wilson) heard oral argument on this case on January 23, 2020.
    After oral argument, Justice Wilson recused himself. Therefore, this case is
    hereby decided by Chief Justice Recktenwald and Justices Nakayama, McKenna,
    and Pollack.
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    collectively “Appellants”) challenge whether the Public
    Utilities Commission (“PUC”) fulfilled its statutory and
    constitutional obligations in reviewing an application for a
    rate increase submitted by Hawaiʻi Gas (“HG”).           HG sought to pass
    on to its customers the costs of its two recently established
    liquid natural gas (“LNG”) projects.         HG began importing LNG
    from the mainland to lessen its reliance on synthetic natural
    gas (“SNG”) manufactured in Hawaiʻi.         LNG displaces a portion of
    SNG in HG’s operations.
    Concerned about LNG’s effects on climate change, as well as
    climate change’s impact upon native Hawaiians, LOL and KLM moved
    to intervene in HG’s rate case.        The PUC denied them intervenor
    status but allowed them to participate in the proceedings on a
    limited basis.     Specifically, LOL and KLM were allowed to
    address only “whether the [PUC] should disallow as unreasonable
    [HG’s] LNG costs due to the effects of [HG’s] use of imported
    LNG on the State’s reliance on fossil fuels2 and greenhouse gas
    emissions” (“GHG emissions”)3.        The PUC expressly considered the
    2     Under HRS § 243-3.5 (2017), “fossil fuel” is defined as “a hydrocarbon
    deposit, such as coal, natural gas, or liquefied natural gas, derived from
    the accumulated remains of ancient plants or animals and used for fuel;
    provided that the term specifically does not include petroleum product.”
    3     The regulations implementing HRS Chapter 342B (2010) (titled “Air
    Pollution Control”), contain the following definition of “Greenhouse gases”:
    “the air pollutant defined as the aggregate group of six greenhouse gases:
    carbon dioxide, nitrous oxide, methane, hydrofluorocarbons,
    perflu[o]rocarbons, and sulfur hexafluoride.” Hawai̒i Administrative Rules
    (“HAR”) § 11-60.1-1 (2014).
    2
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    following issue to be “outside the scope of this rate
    proceeding”:    “The participants’ asserted interest in a clean
    and healthful environment beyond the State’s borders, given the
    Hawaii Constitution’s limited application and scope to a clean
    and healthful environment within the State’s borders.”
    Ultimately, the PUC approved HG’s rate increase in Decision
    and Order No. 35969.      It adopted HG’s representation that the
    two LNG projects would decrease GHG emissions in-state.             LOL and
    KLM appeal, raising statutory and constitutional challenges to
    the PUC’s Decision and Order.        HG continues to challenge whether
    LOL and KLM have standing to bring this appeal.4
    In summary, the issues raised in this appeal, and this
    court’s resolution of each issue, as appropriate, are as
    follows:
    A.    Which standing test applies in this appeal, and
    whether the Appellants have standing under the applicable
    test.
    Resolution: The two-part test for standing
    applies, in which the Appellants must show that
    they are “persons aggrieved” who “participated”
    in the contested case. Appellants meet this
    test, because they demonstrated their members’
    right to a clean and healthful environment was
    specially, personally and adversely affected by
    the PUC’s Decision and Order, and they were
    participants in HG’s contested case.
    4     HG had raised standing in an earlier motion to dismiss. This court
    denied the motion to dismiss without prejudice to re-visiting the issue upon
    consideration of the merits of the appeal.
    3
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    B.    Whether the PUC fulfilled its obligations under HRS
    § 269-6(b) (2007 & Supp. 2011), which provides the
    following:
    The public utilities commission shall
    consider the need to reduce the State’s
    reliance on fossil fuels through energy
    efficiency and increased renewable energy
    generation in exercising its authority
    and duties under this chapter. In making
    determinations of the reasonableness of
    the costs of utility system capital
    improvements and operations, the
    commission shall explicitly consider,
    quantitatively or qualitatively, the
    effect of the State’s reliance on fossil
    fuels on price volatility, export of
    funds for fuel imports, fuel supply
    reliability risk, and greenhouse gas
    emissions. The commission may determine
    that short-term costs or direct costs
    that are higher than alternatives relying
    more heavily on fossil fuels are
    reasonable, considering the impacts
    resulting from the use of fossil fuels.
    Resolution: The PUC did not fulfill its
    obligations under HRS § 269-6(b) because its
    Decision and Order simply reiterated HG’s
    representations that its LNG projects would
    decrease GHG emissions. Further, the PUC’s
    geographic limitation demonstrated that the PUC
    did not intend to consider GHG emissions from
    production, development, and transportation of
    LNG occurring outside of the state. Without
    that information, however, the PUC could not
    have explicitly considered the hidden and long-
    term costs of the state’s reliance on fossil
    fuels.
    C. Whether the PUC violated the Appellants’ due process
    rights by not affording the Appellants a meaningful
    opportunity to be heard concerning GHG emissions.
    Resolution: The PUC violated the Appellants’
    due process rights because the substantive
    limitations on their participation in this rate
    case rendered meaningless any opportunity to be
    heard on the GHG emissions issue.
    D. Whether the PUC abused its discretion in developing a
    policy on measuring GHG emissions through adjudication
    rather than rule-making.
    Resolution: The PUC did not abuse its
    discretion in proceeding through adjudication
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    in this case. The PUC did not attempt to
    bypass a rule, amended rule, or pending rule
    concerning how it should measure GHG emissions.
    Further, Appellants were not unduly burdened in
    this rate case proceeding.
    E.    Whether the PUC fulfilled its affirmative
    constitutional obligation to protect native Hawaiian
    traditional and customary practices.
    Because the PUC improperly curtailed
    Appellants’ substantive participation, the
    record is not sufficiently developed for us to
    address this issue. On remand, the PUC should
    consider its constitutional obligations.
    F.    Whether the PUC fulfilled its affirmative
    constitutional obligation as trustee over natural resources
    within the State’s public trust.
    Again, because the PUC improperly curtailed
    Appellants’ substantive participation, the
    record is not sufficiently developed for us to
    address this issue. On remand, the PUC should
    consider its constitutional obligations.
    II.   Background
    A.   HG’s rate case application
    In August 2017, HG filed an application with the PUC for
    approval to increase its existing gas utility rates and to
    revise certain rate schedules and rate rules.          This “rate case”
    was brought pursuant to HRS § 269-16 (2007 & Supp. 2014), titled
    “Regulation of utility rates; ratemaking procedures.”              Under
    that statute, “All rates, fares, charges, classifications,
    schedules, rules, and practices made, charged, or observed by
    any public utility . . . shall be just and reasonable and shall
    be filed with the [PUC].”      HRS § 269-16(a) (2007 & Supp. 2014).
    HG explained that it needed a total revenue increase of $14.962
    million, “or 14.58% increase over revenue at present rates, in
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    order for HG to have the opportunity to recover its reasonably
    incurred expenses and earn its requested rate of return of 7.51%
    on its prudently incurred investments in utility property” since
    its last rate case in 2009.
    Relevant to this appeal, HG sought to include the costs of
    two new LNG projects in its rate base:      the SNG Backup
    Enhancement Project and the 30% SNG Conversion Project.        HG
    explained that there is “no indigenous natural gas in Hawaii or
    access to natural gas distribution pipelines, which means that
    gas must either be synthetically manufactured or imported.”           HG
    stated that it manufactures its own SNG through a catalytic
    conversion process “utilizing a by-product of the oil refining
    process known as naphtha (i.e., SNG Feedstock).”       HG depends
    upon Par Hawaii Refining, LLC to supply it with SNG Feedstock.
    HG explained that this imported oil product subjects gas rates
    to “meaningful price volatility.”       Therefore, HG had secured PUC
    approval to import LNG as a way to “diversify its fuel supply to
    reduce its dependence on oil-based feedstock and local refinery
    infrastructure.”
    The first of the two new LNG projects was the SNG Backup
    Enhancement Project.     It involved the purchase of close to one
    million dollars in equipment, including three LNG ISO
    containers, a trailer chassis, a trailer-mounted mobile re-
    gasifier, and certain improvements to Pier 38, the location of
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    the backup system.     In 2014, the PUC issued an order that, inter
    alia, did not preclude HG from including these costs in its next
    rate case (PUC Docket No. 2013-0184).
    The second of the two new LNG projects was the 30% SNG
    Conversion Project, which uses imported LNG to displace 30% of
    HG’s SNG production.     The PUC previously approved the project in
    2016 (PUC Docket No. 2014-0315).        HG estimated the project cost
    to be $13.9 million for ISO containers, LNG regasification and
    injection equipment, relocation of a plant maintenance building,
    and the ISO container site.
    B.   PUC Order No. 35112 setting the rate case issues
    On December 18, 2017, via Order No. 35112, the PUC
    identified the issues raised by HG in its Application.        All of
    the issues pertained to the economic reasonableness of the rate
    increase.    The only other party to this proceeding was the
    Consumer Advocate, an ex officio party pursuant to HRS § 269-51
    (2007 & Supp. 2014) (“The executive director of the division of
    consumer advocacy shall be the consumer advocate in hearings
    before the public utilities commission.       The consumer advocate
    shall represent, protect, and advance the interests of all
    consumers . . . of utility services. . . . The consumer advocate
    shall have full rights to participate as a party in interest in
    all proceedings before the public utilities commissions.”).           See
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    also HAR § 6-61-62(a) (1992) (“The consumer advocate is, ex
    officio, a party to any proceeding before the commission.”).
    C.    This court’s MECO opinion
    Four days before the PUC set its procedural schedule in
    Order No. 35112, this court issued its opinion in In re
    Application of Maui Elec. Co., 141 Hawaiʻi 249, 
    408 P.3d 1
     (2017)
    (“MECO”).    In MECO, we held that there is a “protectable
    property interest” in the “right to a clean and healthful
    environment guaranteed by article XI, section 9 and defined by
    HRS Chapter 269,” which governs the PUC.       141 Hawaiʻi at 253,
    271, 408 P.3d at 5, 23.     We also examined the legislative
    history of HRS § 269-6(b), as amended in 2011, which revealed
    the legislature’s intent “to require the [PUC] to consider the
    hidden and long-term costs of reliance on fossil fuels, which
    subjects the State and its residents to ‘increased air
    pollution’ and ‘potentially harmful climate change due to the
    release of harmful greenhouse gases.’”      141 Hawaiʻi at 263, 408
    P.3d at 15.    We further held that “HRS § 269-6(b)’s requirement
    to reduce reliance on fossil fuels and to consider greenhouse
    gas emissions applies to the fulfillment of all of the
    Commission’s duties.”     Id.
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    D.    Motions to intervene
    Weeks after the MECO opinion was filed, in January 2018,
    LOL and KLM5 each moved to intervene in this rate case.             LOL
    asserted it had an interest in the environment and in climate
    change.    KLM stated that it represented native Hawaiian
    interests.
    HG opposed both LOL’s and KLM’s motions to intervene.               In
    both filings, HG challenged whether LOL and KLM had standing,
    arguing that neither met the traditional three-prong test for
    standing ((1) injury in fact; (2) causation; and (3)
    redressability)).     Further, HG argued that the PUC had already
    approved the “current importation of LNG, as a displacement to
    [HG’s] existing oil-based naphtha fuel source,” in previous
    dockets, Docket No. 2013-0184, the SNG Backup Enhancement
    Project, and Docket No. 2014-0315, the 30% SNG Conversion
    Project.    HG noted LOL was granted participant status in the 30%
    SNG Conversion Project and “had an opportunity to meaningfully
    advocate its position” then.        HG also argued that, if KLM wanted
    to oppose the HG’s importation of LNG, it should have done
    likewise.    HG concluded its oppositions stating it was not
    5     Another non-profit group, 350 Hawaiʻi, also moved to intervene.   350
    Hawaiʻi is not a party to the instant appeal.
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    opposed to having the PUC grant LOL and KLM participant status
    in the proceedings.
    E.    PUC Order No. 35267 denying LOL’s and KLM’s motions to
    intervene but granting LOL and KLM participant status
    limited to sub-Issue No. 1h
    In February 2018, the PUC denied the Appellants’ motions to
    intervene; on its own motion, however, the PUC granted the
    Appellants participant status in this rate case.           In its Order
    No. 35267, the PUC limited their participation to addressing
    only the following issue, which the PUC added to the rate case
    proceeding as “sub-Issue No. 1h”:
    1. Whether HG’s proposed rate increase is reasonable,
    including, but not limited to:
    . . . .
    h. With respect to [HG’s] purchase and use of
    imported [LNG] as part of its gas utility operations,
    HRS § 269-6(b)’s requirement that:
    In making determinations of the reasonableness
    of the costs of utility system capital
    improvements and operations, the commission
    shall explicitly consider, quantitatively or
    qualitatively, the effect of the State’s
    reliance on fossil fuels . . . and greenhouse
    gas emissions. The commission may determine
    that short-term costs or direct costs that are
    higher than alternatives relying more heavily
    on fossil fuels are reasonable, considering the
    impacts resulting from the use of fossil fuels.
    In effect, whether the commission should disallow as
    unreasonable [HG’s] LNG costs due to the effects
    of [HG’s] use of imported LNG on the State’s
    reliance on fossil fuels and greenhouse gas
    emissions.
    The PUC restricted LOL and KLM’s input on the GHG emissions
    issue as follows:
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    Concomitantly, issues outside the scope of this rate
    proceeding (Docket No. 2017-0105) include, but are not
    necessarily limited to:
    The participants’ asserted interest in a clean and
    healthful environment beyond the State’s borders,
    given the Hawaii Constitution’s limited application
    and scope to a clean and healthful environment within
    the State’s borders.
    Evidence of a causal connection between greenhouse
    gas emissions and climate change.
    Instead, this commission, pursuant to HRS § 91-10(4)
    (taking notice of judicially recognizable facts) and
    HAR § 6-61-48 (official notice of matters as may be
    judicially noticed by the courts of the State), takes
    official notice of:
    A. Act 32, part I, Session Laws of Hawaii
    2017, by which the Legislature: (i) recognizes
    that “[c]ountless scientific studies have
    concluded that greenhouse gas emissions are a
    leading contributing factor to global
    warming[;]” and (ii) finds that climate change
    is “real.”
    B. HRS chapter 342B, part VI, Greenhouse Gas
    Emissions, including HRS § 342B-71, which
    states:
    Statewide greenhouse emissions limit, adoption.
    A statewide greenhouse gas emissions limit to
    be achieved by 2020 is hereby established that
    is equal to or below the level of the statewide
    greenhouse gas emissions in 1990, as determined
    by section 3 of Act 234, Session Laws of Hawaii
    2007; provided that for the purposes of this
    Act greenhouse gas emissions from airplanes
    shall not be included.
    HRS § 342B-71.
    Whether [HG’s] importation, purchase, and use of LNG
    should be banned or prohibited by federal or State
    law or by the commission.
    Whether fracking should be banned or prohibited by
    federal or State law or by the commission.
    Whether all new coal, oil, and gas projects,
    including “climate intense” projects, should be
    banned by federal or State law or by the commission.
    The PUC rejected HG’s argument that LOL should be barred
    “from asserting a HRS § 269-6(b) review under the specific
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    circumstances of the subject proceeding” simply because LOL did
    not participate in the SNG Backup Enhancement Project docket
    before the PUC, and participated on a limited basis in the 30%
    SNG Conversion Project docket before the PUC.       Likewise, the PUC
    stated that KLM was not similarly barred from asserting an HRS
    § 269-6(b) review in this case simply because KLM did not move
    to intervene or otherwise participate in the two prior LNG
    dockets.   The PUC explained that it read MECO’s standing
    requirement as “appl[ying] to whether an entity has the
    requisite standing to appeal,” not whether an entity has “met
    its burden of proving that it is entitled to intervene or
    participate in a [PUC] proceeding, pursuant to the applicable
    provisions of HAR §§ 6-61-55 and 6-61-56.”
    F.    LOL’s notice and the PUC Order No. 35346 addressing that
    notice
    On March 5, 2018, LOL filed a “Notice” with the PUC,
    challenging Order No. 35627’s “exclusion of the entire section
    of Act 234 [of the 2007 Legislative Session] regarding the
    global nature of emissions.”     Act 234 established a “Greenhouse
    gas emissions reduction task force” and directed it to create a
    “work plan” that “shall include but is not limited to the
    following objectives: . . . . Recommendations to minimize
    ‘leakage’ or a reduction in emissions of greenhouse gases within
    the State that is offset by an increase in emissions of
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    greenhouse gases outside the State. . . .”         Act 234, 2007 Haw.
    Sess. Laws, at 700.     LOL stated that the PUC should have also
    taken judicial notice of the global nature of emissions instead
    of limiting sub-Issue No. 1h to the Participants’ interest in “a
    clean and healthful environment within the State’s borders,” and
    not “beyond the State’s borders.”
    In Order No. 35346, dated March 16, 2018, the PUC addressed
    LOL’s Notice.    It reaffirmed its limitation in sub-Issue No. 1h
    to a clean and healthful environment within, not beyond, the
    State’s borders by citing to article XV, section 1 of the Hawaiʻi
    State Constitution, which is titled “Boundaries” and provides
    the following:
    The State of Hawaii shall consist of all the islands,
    together with their appurtenant reefs and territorial and
    archipelagic waters, included in the Territory of Hawaii on
    the date of enactment of the Admission Act, except the
    atoll known as Palmyra Island, together with its
    appurtenant reefs and territorial waters; but this State
    shall not be deemed to include the Midway Islands, Johnston
    Island, Sand Island (offshore from Johnston Island) or
    Kingman Reef, together with their appurtenant reefs and
    territorial waters.
    The PUC also cited to section 2 of the Admission Act, which
    similarly provides as follows:
    The State of Hawaii shall consist of all the islands,
    together with their appurtenant reefs and territorial
    waters, included in the Territory of Hawaii on the date of
    enactment of this Act, except the atoll known as Palmyra
    Island, together with its appurtenant reefs and territorial
    waters, but said State shall not be deemed to include the
    Midway Islands, Johnston Island, Sand Island (offshore from
    Johnston Island), or Kingman Reef, together with their
    appurtenant reefs and territorial waters.
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    G.   Joint information requests and HG’s responses
    In February 2018, LOL and KLM6 filed joint information
    requests to HG seeking answers to 85 questions, the vast
    majority of which HG refused to answer.         Of importance to this
    appeal, LOL and KLM asked HG the following question, labeled
    JP-IR-49 (“information request 49”):        “What [are] the cumulative
    lifetime greenhouse gas emissions associated with each project
    seeking rate recovery in this instant docket[?]”           HG first
    objected to the question as being “vague, ambiguous, irrelevant
    and outside the scope of sub-Issue No. 1h.”          HG ultimately
    answered the question, however, and represented that the LNG
    projects would result in decreased GHG emissions as follows:
    Without waiving any right or objection thereto, HG states
    as follows with respect to the LNG-related projects:
    Currently for the 30% [SNG] Conversion Project, which
    displaces quantities of SNG with LNG, greenhouse gas
    emissions associated with the SNG Plant’s stationary
    equipment fuel use (reported to the EPA under Subpart C)
    would decrease due to the amount of SNG displaced with LNG.
    In other words, greenhouse gas emissions associated with
    SNG production would decrease because less SNG is produced.
    Greenhouse gas emissions associated with LNG sold to HG
    customers (reported to the EPA under Subpart NN) would be
    nearly identical to displaced SNG because LNG is chemically
    similar to the SNG produced at the SNG Plant. The life of
    the 30% [SNG] Conversion Project has not been determined.
    Currently for the [SNG] Backup Enhancement Project, a
    similar displacement principle would be applicable.
    However, because the amount of vaporized LNG injected into
    the transmissions pipeline will vary according to the
    number and length of SNG Plant shutdowns, the actual amount
    is difficult to quantify. For every therm of vaporized LNG
    6     Another organization, Hawaiʻi 350, was also included in the joint
    filing, but it is not a party to the present appeal. See supra, note 5.
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    injected into the pipeline to back up the SNG Plant, the
    total amount of greenhouse gas emissions would decrease due
    to the reduction in stationary equipment fuel necessary to
    create the displaced SNG. The life of the [SNG] Backup
    Enhancement Project has not been determined.
    H.   Joint participants’ testimony and exhibits
    In March 2018, LOL and KLM jointly7 filed testimony and
    exhibits.    KLM highlighted the following impacts of climate
    change on native Hawaiian cultural practices:
    (1) storms and rising sea levels will destroy navigation
    points for Hawaiian seafarers;
    (2) “forced migration of Polynesian communities [will]
    exacerbat[e] culture, identity, social welfare, and self-
    determination efforts”;
    (3) “rising temperature and ocean acidification [will]
    alter[] marine species distribution, impacting lawaiʻa, and
    their cultural knowledge and practices”;
    (4) “Papahānaumokuākea Marine National Monument will lose
    nesting [and pupping] sites for Hawaiian Monk Seal[s],
    Green Turtle nesting areas and Laysan Finch habitat”;
    (5) “coastal erosion and rapid sea level rise . . . [will]
    threaten[] the cultural practice of burying ̒iwi kupuna
    along Hawaiʻi’s shores, which prevents the ʻuhane from
    joining the ʻaumakua, interrupting the delicate balance
    between salt and fresh water in loko iʻa, flooding and loss
    of burial grounds, home sites, fishponds, historic trails,
    heiau, and petroglyphs, the loss of salt cultivation, beach
    erosion, and contamination of crops and freshwater
    resources”;
    (6) “declining health of the forests, [including] ʻōhiʻa
    lehua losses from Rapid ʻŌhiʻa Death, ʻāhinahina species on
    Mauna Loa, Mauna Kea and Haleakalā under threat, avian
    malaria infected mosquito populations moving up mountains
    ruining [the] few remaining disease-free refuges for native
    birds”; and
    (7) “mountains are under attack[,] resulting in the loss of
    the snow season on Mauna Kea, the loss of the home of
    Poliʻahu.”
    7     Another organization, Hawaiʻi 350, was also included in the joint
    filing, but it is not a party to the present appeal. See supra, notes 5&6.
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    KLM characterized climate change’s effect upon native Hawaiians
    as “another overthrow.”
    LOL’s written testimony focused on two kinds of accounting
    methodologies by which GHG emissions can be measured.        The first
    is the “Production-Based GHGE Accounting System” (“PAS”), and
    the second is the “Customer-Based GHGE Accounting System”
    (“CAS”).   LOL testified that the PAS method determines “the
    greenhouse gas emissions at a power plant per BTU of power
    generated,” while the CAS method determines “the embedded
    greenhouse gas emissions per BTU of power generated.”        In other
    words, CAS takes into account greenhouse gases produced not
    simply upon the use of fuel (as PAS does), but also greenhouse
    gases produced upon making the fuel itself.       LOL asserted HG’s
    “fuel has large, hidden emissions which distort the value of
    their fuel.”    LOL stated that the PUC had yet to adopt any
    particular accounting methodology for measuring GHG emissions.
    It urged the PUC to adopt the CAS methodology.       LOL also
    asserted that the “participants would expect that they would
    have due process rights to review any other proposed system
    before its adoption.”
    I.    Briefing on sub-Issue No. 1h
    In June 2018, HG and the Consumer Advocate settled on a
    reasonable rate increase; therefore, the evidentiary hearing
    scheduled for that month was waived by the parties and
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    participants.    In lieu of an evidentiary hearing on the
    remaining sub-Issue No. 1h, HG and the participants agreed to
    file opening and reply briefs.8
    In its opening brief, HG argued that the PUC should not
    disallow, as unreasonable, HG’s LNG costs “due to the effects of
    HG’s use of imported LNG on the State’s reliance on fossil fuels
    and greenhouse gas emissions,” because (1) the PUC “ha[d]
    already determined that HG’s expenditures for LNG [we]re prudent
    and in the public interest in Docket Nos. 2014-0315 [30% SNG
    Conversion Project] and 2013-0184 [SNG Backup Enhancement
    Project]”; (2) HG’s response to information request 49 was that
    its LNG projects would decrease GHG emissions; and (3) LOL and
    KLM did not introduce any contrary evidence and, instead,
    offered only generalized statements regarding broad policy
    issues.   In their joint reply brief, LOL and KLM counter-argued
    that HG “presented no data on life cycle emissions to
    substantiate [the] claim” that its two LNG projects would
    decrease GHG emissions, as it asserted in its response to
    information request 49.
    In their joint opening brief, LOL and KLM cited MECO, 141
    Hawaiʻi 249, 
    408 P.3d 1
    , to hold the PUC to its statutory
    obligation under HRS § 269-6(b) to consider the “hidden and long
    8     The Consumer Advocate, while a party, did not take a position on sub-
    Issue No. 1h.
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    term costs” of HG’s LNG projects.         To that end, they called on
    the PUC to adopt the CAS methodology for measuring “life cycle”
    GHG emissions.     They noted, for example, that LNG fracked9 out-
    of-state releases methane, which is “34 times stronger than
    [carbon dioxide] in trapping heat over a 100-year period and 86
    times stronger over 20 years.”        LOL and KLM also urged the PUC
    to fulfill its obligations under Hawaiʻi state constitutional
    provisions protecting (1) Hawaiʻi’s natural resources, which are
    held in public trust, (2) the right to a clean and healthful
    environment, and (3) native Hawaiian traditional and customary
    rights.   LOL and KLM accused HG of recklessly expanding LNG use
    in Hawaiʻi without providing clear information about its GHG
    emissions.    In its reply brief, HG pointed out that it did not
    seek to expand the use of LNG; rather, the LNG projects had
    already been approved, and HG sought only to include those
    projects in its rate base.
    J.   PUC Decision and Order No. 35969
    On December 21, 2018, the PUC handed down its Decision and
    Order No. 35969.     It approved HG and the Consumer Advocate’s
    stipulation upon settlement, granting HG an increase of
    $8,896,152, or approximately 8.39% over revenues at present
    rates . . . .”     The PUC specifically found that both the 30% SNG
    9     The record does not indicate where or how HG’s imported LNG is sourced.
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    Conversion Project and the SNG Backup Enhancement Project were
    “used and useful for public utilities purposes” and granted as
    “reasonable” the stipulated cost recovery for both projects.
    The PUC specifically found and concluded, “The [S]NG Backup
    Enhancement System increases the reliability of [HG’s] SNG
    operations in the event of planned and unplanned SNG Plant
    outages, to the customers’ benefit.”      It also appeared to adopt,
    in its specific findings and conclusions, a prior
    “articulat[ion]” that the 30% SNG Conversion Project would
    increase Hawaiʻi’s “fuel diversity” in two ways:       first, by
    diversifying the State’s fuel supply by adding LNG; and, second,
    by diversifying the State’s sources of fuel, because HG planned
    to purchase LNG from “two different suppliers through different
    ports in difference regions,” in the event one supplier were to
    become unavailable.
    The PUC’s Decision and Order contains a separate section
    addressing sub-Issue No. 1h, titled “In Making Determinations of
    the Reasonableness of the Costs of Utility System Capital
    Improvements and Operations, the Commission Shall Explicitly
    Consider, Quantitatively or Qualitatively, the Effect of the
    State’s Reliance on Fossil Fuels on Price Volatility, Export of
    Funds for Fuel Imports, and Fuel Supply Reliability Risk, and
    Greenhouse Gas Emissions,” which tracks the language of HRS
    § 269-6(b).    The commission stated that it “explicit[ly]
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    consider[ered], weigh[ed], and balanc[ed] . . . the four
    specified criteria” before “find[ing] reasonable [HG’s] 2018
    Test Year LNG utility system capital improvements and operations
    costs.”   The PUC therefore “decline[d] to disallow [HG’s] 2018
    Test Year LNG costs.”      The PUC made “specific[] find[ings] and
    conclu[sions]” concerning the four specified criteria, grouping
    its analysis of “price volatility” and “fuel supply reliability
    risk” together, then addressing “export of funds for fuel
    imports,” and “greenhouse gas emissions.”
    As to GHG emissions, the PUC appeared to adopt HG’s
    representation that the 30% SNG Conversion Project and SNG
    Backup Enhancement Project would result in decreased GHG
    emissions:
    A. For the 30% [SNG] Conversion Project (i.e., Docket No.
    2014-0315), greenhouse gas emissions associated with the
    SNG Plant’s stationary equipment fuel use will decrease
    (i.e., reported to the EPA under Subpart C), while
    greenhouse gas emissions associated with LNG sold to
    customers (i.e., reported to the EPA under Subpart NN) will
    be nearly identical to displaced SNG; and
    B. For the [S]NG Backup Enhancement . . . Project (i.e.,
    Docket No. 2013-0184), a similar displacing SNG with LNG
    principle will apply.
    14.   As [HG] specifically explains:
    Currently for the 30% [SNG] Conversion Project, which
    displaces quantities of SNG with LNG, greenhouse gas
    emissions associated with the SNG Plant’s stationary
    equipment fuel use (reported to the EPA under Subpart C),
    would decrease due to the amount of SNG displaced with LNG.
    In other words, greenhouse gas emissions associated with
    SNG production would decrease because less SNG is produced.
    Greenhouse gas emissions associated with LNG sold to HG
    customers (reported to the EPA under Subpart NN) would be
    nearly identical to displaced SNG because LNG is chemically
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    similar to the SNG produced at the SNG Plant. The life of
    the 30% [SNG] Conversion Project has not been determined.
    Currently for the [SNG] Backup Enhancement Project, a
    similar displacement principle would be applicable.
    However, because the amount of vaporized LNG injected into
    the transmissions pipeline will vary according to the
    number and length of SNG Plant shutdowns, the actual amount
    is difficult to quantify. For every therm of vaporized LNG
    injected into the pipeline to back up the SNG Plant, the
    total amount of greenhouse gas emissions would decrease due
    to the reduction in stationary equipment fuel necessary to
    create the displaced SNG. The life of the [SNG] Backup
    Enhancement Project has not been determined.
    The PUC then found and concluded, “Participants have not
    produced any credible evidence:       (A) which contradicts [HG’s]
    evidence; or (B) that [HG’s] use of LNG as part of its utility
    operations will increase greenhouse gas emissions.”           The PUC
    continued, “Instead, Participants rely on general assertions,
    without credible evidentiary support, that [HG’s] use of
    imported LNG will increase greenhouse gas emissions.”
    The PUC included a separate section in its Decision and
    Order titled “Commission’s Response to the Legal Arguments
    Raised.”   The PUC first concluded that “HRS § 269-6(b), by its
    plain language, does not mandate the [PUC’s] adoption of the
    Customer-Based GHGE Accounting System (i.e. CAS) described by
    [LOL and KLM].”    Next, with respect to the Hawaiʻi State
    Constitution’s rights to due process and to a clean and
    healthful environment, the PUC expressly acknowledged MECO’s
    holding that “HRS Chapter 269 is a law relating to environmental
    quality that defines the right to a clean and healthful
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    environment under article XI, section 9 of the Hawaii
    Constitution, by providing that express consideration be given
    to reducing greenhouse gas emissions in the [PUC’s] decision-
    making (specifically citing to HRS § 269-6(b)). . . .”            The PUC
    also acknowledged MECO’s due process holding that a clean and
    healthful environment is a protected property interest, and that
    the PUC has “authority to set limitations in conducting the
    proceedings so long as the procedures sufficiently afford an
    opportunity to be heard at a meaningful time and in a meaningful
    manner on the issue of [a utility’s proposed] impact on the
    asserted property interest.”       The PUC then concluded that LOL
    and KLM were afforded an opportunity to be heard at a meaningful
    time and in a reasonable manner on sub-Issue No. 1h, due to
    their extensive participation in the rate case proceedings.              LOL
    and KLM timely appealed the PUC’s Decision and Order.
    III.   Standards of review
    A.   Agency appeals
    This court reviews appeals from PUC decisions under HRS
    § 91-14(g), which states the following:
    Upon review of the record, the court may affirm the
    decision of the agency or remand the case with instructions
    for further proceedings; or it may reverse or modify the
    decision and order if the substantial rights of the
    petitioners may have been prejudiced because the
    administrative findings, conclusions, decisions, or orders
    are:
    (1) In violation of constitutional or statutory provisions;
    (2) In excess of the statutory authority or jurisdiction of
    the agency;
    (3) Made upon unlawful procedure;
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    (4) Affected by other error of law;
    (5) Clearly erroneous in view of the reliable, probative,
    and substantial evidence on the whole record; or
    (6) Arbitrary, or capricious, or characterized by abuse of
    direction or clearly unwarranted exercise of discretion.
    Conclusions of law are reviewed de novo, pursuant to
    subsections (1), (2) and (4); questions regarding procedural
    defects are reviewable under subsection (3); findings of fact
    (FOF) are reviewable under the clearly erroneous standard,
    pursuant to subsection (5); and an agency’s exercise of
    discretion is reviewed under the arbitrary and capricious
    standard, pursuant to subsection (6).        Matter of Haw. Elec.
    Light Co., 145 Hawaiʻi 1, 10-11, 
    445 P.3d 673
    , 682-83 (2019)
    (“HELCO”) (citation omitted).       “Mixed questions of law and fact
    are ‘“reviewed under the clearly erroneous standard because the
    conclusion is dependent upon the facts and circumstances of the
    particular case.”’”     HELCO, 145 Hawaiʻi at 11, 445 P.3d at 683.
    (citation omitted).
    B.   Statutory interpretation
    We review the circuit court’s interpretation of a
    statute de novo.    State v. Pacheco, 96 Hawaiʻi 83, 94, 
    26 P.3d 572
    , 583 (2001).    Our statutory construction is guided by
    established rules:
    When construing a statute, our foremost obligation is to
    ascertain and give effect to the intention of the
    legislature, which is to be obtained primarily from the
    language contained in the statute itself. And we must read
    statutory language in the context of the entire statute and
    construe it in a manner consistent with its purpose.
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    96 Hawaiʻi at 94, 
    26 P.3d at 583
     (citations omitted).
    C.   Constitutional law
    Questions of constitutional law are reviewed de novo, under
    the right/wrong standard.       Blair v. Harris, 98 Hawaiʻi 176, 178,
    
    45 P.3d 798
    , 800 (2002).
    D.   Agency rule-making
    An agency possesses broad discretion to proceed by general
    rule-making or by adjudication.       Application of Hawaiian Elec.
    Co., 81 Hawaiʻi 459, 467, 
    918 P.2d 561
    , 569 (1996).       This court
    reviews for an abuse of discretion an agency’s decision to
    proceed by adjudication rather than by rule-making.
    IV.   Discussion
    A.    LOL and KLM have standing to appeal the PUC’s decision and
    order.
    HG once again argues LOL and KLM lack standing to bring
    this appeal, contending they do not satisfy the traditional
    three-prong test for standing used in MECO, 141 Hawaiʻi 249, 
    408 P.3d 1
    :   (1) injury in fact, (2) causation, and (3)
    redressability.    LOL and KLM counter-argue that the applicable
    test for standing in administrative appeals is the two-prong
    test used in HELCO, 145 Hawaiʻi 1, 
    445 P.3d 673
    :       (1) “one must
    be a person aggrieved . . . by a final decision and order in a
    contested case,” and (2) “the aggrieved person must have
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    participated in the contested case from which the decision
    affecting him resulted.”
    The two-prong test for standing applies.      MECO applied the
    traditional three-prong standing test on appeal because the
    appellants there challenged a PUC order denying them intervenor
    or participant status in the first instance.       141 Hawaiʻi at 256,
    408 P.3d at 8.    In this case, HG did not appeal the PUC’s order
    granting LOL and KLM participant status.       Rather, this is an
    appeal brought by LOL and KLM, who participated in the contested
    rate case and are aggrieved by the PUC’s final decision and
    order.   They are bringing an administrative appeal.       Therefore,
    we apply the well-established two-prong standing test, most
    recently re-affirmed in HELCO, for intervenors or participants
    who are appealing final decisions and orders of the PUC.        See
    also Life of the Land, Inc. v. Land Use Comm’n, 
    61 Haw. 3
    , 6,
    
    594 P.2d 1079
    , 1081 (1979) (holding there are “two basic
    requirements” for standing to appeal an agency decision:
    “first, one must be a person aggrieved and second, the aggrieved
    party must have participated in a contested case.”); Application
    of Hawaiian Elec. Co., 
    56 Haw. 260
    , 265, 
    535 P.2d 1102
    , 1106
    (1975) (“[W]here the appellants have been ‘aggrieved’ by the
    action of the PUC, and where they were involved as
    ‘participants’ during the agency hearings, and where the PUC
    staff (the agency through which they participated at the
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    hearings) has failed to appeal the decision of the PUC, the
    appellants may challenge the order of the PUC in this court.”);
    City & Cty. of Honolulu v. Pub. Utils. Comm’n., 
    53 Haw. 431
    ,
    433, 
    495 P.2d 1180
    , 1182 (1972) (per curiam) (“HRS § 91-14(a),
    which provides ‘(a)ny person aggrieved by a final decision and
    order in a contested case . . . is entitled to judicial review
    . . .’, is clear and unambiguous that the person aggrieved must
    have been involved in the contested case before the PUC.”).
    In this case, Appellants have sufficiently alleged that the
    PUC’s decision “specially, personally, and adversely affected”
    their members.    HELCO, 145 Hawaiʻi at 21, 445 P.3d at 693.      LOL
    is a Hawaiʻi nonprofit organization with members who live, work,
    and recreate in Hawaiʻi and are “deeply concerned” about the
    environmental and financial impacts of climate change in
    Hawaiʻi.   LOL asserts that sea level rise as a result of climate
    change and increased GHG emissions will result in over 20,000
    Hawaiʻi residents in need of new homes and could “generate
    substantial social, infrastructure, and economic impacts with
    ripple effects throughout the State,” which will invariably harm
    its members.    Similarly, KLM is a Hawaiʻi nonprofit dedicated to
    protecting native Hawaiian rights, with members who reside in
    Hawaiʻi and have an interest in protecting native Hawaiian
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    traditions and culture.      It asserts that the combined effects of
    climate change will adversely impact its members.           For example,
    saltwater intrusions into the freshwater aquifers, coastal
    erosion and rapid sea level rise [will] threaten[] the
    cultural practice of burying ʻiwi kupuna along Hawaiʻi’s
    shores, which prevents the ʻuhane from joining the ʻaumakua,
    interrupting the delicate balance between salt and fresh
    water in loko iʻa, flooding and loss of burial grounds, home
    sites, fishponds, historic trails, heiau, and petroglyphs,
    the loss of salt cultivation, beach erosion, and
    contamination of crops and freshwater resources.
    Thus, Appellants have demonstrated they are “persons aggrieved”
    who participated in the contested case; therefore, they have
    standing to appeal.
    B.    The PUC did not fulfill its statutory obligations under HRS
    § 269-6(b).
    Appellants argue the PUC failed to carry out its mandate
    under HRS § 269-6(b), which states the following (with emphases
    added):
    The public utilities commission shall consider the need to
    reduce the State’s reliance on fossil fuels through energy
    efficiency and increased renewable energy generation in
    exercising its authority and duties under this chapter. In
    making determinations of the reasonableness of the costs of
    utility system capital improvements and operations, the
    commission shall explicitly consider, quantitatively or
    qualitatively, the effect of the State’s reliance on fossil
    fuels on price volatility, export of funds for fuel
    imports, fuel supply reliability risk, and greenhouse gas
    emissions. The commission may determine that short-term
    costs or direct costs that are higher than alternatives
    relying more heavily on fossil fuels are reasonable,
    considering the impacts resulting from the use of fossil
    fuels.
    First, the Appellants contend that the PUC’s consideration of
    GHG emissions should not have been geographically limited to
    those emissions occurring within the State’s borders.            Second,
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    the Appellants assert that the PUC’s Decision and Order merely
    adopted, without substantiating, HG’s representations in
    information request 49 that its LNG projects would result in
    decreased GHG emissions.
    As to the Appellants’ first point, HG and the PUC respond
    that the plain language of HRS § 269-6(b) does not require the
    PUC to consider GHG emissions beyond the State’s borders.        As to
    the Appellants’ second point, HG and the PUC counter-argue that
    the PUC made express findings on the GHG emissions issue in the
    section of its Decision and Order titled “Greenhouse Gas
    Emissions,” and that HG’s answer to information request 49 is
    the “only credible evidence in the record.”
    Appellants are correct.    In interpreting HRS § 269-6(b), we
    look to “the language contained in the statute itself,” which
    must be read “in the context of the entire statute and
    construe[d] . . . in a manner consistent with its purpose.”
    Pacheco, 96 Hawaiʻi at 94, 
    26 P.3d at 583
     (citations omitted).
    We note that the plain language of HRS § 269-6(b) does not limit
    the PUC’s consideration of GHG emissions to those only occurring
    within the state.    Also, elsewhere in the HRS, where the
    legislature has intended to limit consideration of certain GHG
    emissions, it plainly does so.      For example, HRS § 342B-71
    (2010) sets a “[s]tatewide greenhouse gas emissions limit” at
    “equal to or below the level of the statewide greenhouse gas
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    emissions in 1990,” but it specifically excludes “greenhouse gas
    emissions from airplanes.”     It is “generally presumed that the
    legislature acts intentionally and purposely in the disparate
    inclusion or exclusion” of terms in its statutes.        State v.
    Savitz, 97 Hawaiʻi 440, 447, 
    39 P.3d 567
    , 574 (2002) (holding
    that the legislature could have drafted a statute to include a
    limitation on the court’s discretion, and noting that “[t]he
    fact that it did not do so manifests its intent that it chose
    not to do so”).    If the legislature intended HRS § 269-6(b) to
    exclude from the PUC’s consideration GHG emissions generated
    out-of-state by imported fossil fuels, it would have done so.
    We have also already extensively examined the purpose of
    HRS § 269-6(b), as amended, in MECO, 141 Hawaiʻi 249, 
    408 P.3d 1
    .
    In that case, we noted “a primary purpose” of the statute is to
    “require the [PUC] to consider the hidden and long-term costs of
    reliance on fossil fuels, which subjects the State and its
    residents to ‘increased air pollution’ and ‘potentially harmful
    climate change due to the release of harmful greenhouse
    gases.’”   MECO, 141 Hawaiʻi at 263, 408 P.3d at 15 (citing H.
    Stand. Comm. Rep. No. 1004, in 2011 House Journal, at 1332)
    (emphasis added)).
    Appellants contend HG has quite literally “hidden” the GHG
    emissions impact of its imported LNG.      The “hidden” GHG
    emissions impacts Appellants are concerned with include GHG
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    emissions from the extraction, development, production, and
    transportation of imported LNG, which occur out-of-state, but
    which, nonetheless, impact Hawaiʻi due to the global nature of
    GHG emissions.     We agree with this contention.10        In MECO, this
    court noted that “it is commonly understood that ‘[a]ir
    pollution is transient’ and is ‘heedless’ of even ‘state
    boundaries.’” 141 Hawaiʻi at 268, 408 P.3d at 20 (citing E.P.A.
    v. EME Homer City Generation, L.P., 
    134 S.Ct. 1584
    , 1592
    (2014)).
    Over a decade before we issued our MECO opinion, the
    legislature had already expressed its concern about the impact
    on Hawaiʻi of GHG emissions produced out-of-state.            In 2007, the
    legislature committed the state to reduce, by January 1, 2020,
    10     We note the Appellants and HG touch on the Commerce Clause of the
    United States Constitution in their briefing. Under the Commerce Clause,
    Congress has the power to “regulate Commerce with foreign Nations, and among
    the several States, and with the Indian Tribes.” U.S. Const. art. I, § 8,
    cl. 3. The Commerce Clause “has long been understood to have a ‘negative’
    aspect that denies the States the power unjustifiably to discriminate against
    or burden the interstate flow of articles in commerce.” Or. Waste Sys., Inc.
    v. Dep’t of Envtl. Quality of State of Or., 
    511 U.S. 93
    , 98 (1994).
    HG argues that interpreting HRS § 269-6(b) to take into account out-of-
    state GHG emissions produced by its imported LNG is extra-territorial
    legislation, and per se unconstitutional under Healy v. Beer Inst., 
    491 U.S. 324
    , 336 (1989), because it attempts to regulate GHG emissions beyond
    Hawaiʻi’s borders. Failing that, HG argues in the alternative that
    interpreting HRS § 269-6(b) this way violates the commerce clause under Pike
    v. Bruce Church, Inc., 
    397 U.S. 137
     (1970), because the burden imposed on
    interstate commerce outweighs any putative local benefit to Hawaiʻi.
    To the extent the dormant Commerce Clause is even implicated in this
    case, it is not violated. HRS § 269-6(b) tasks the PUC only with
    explicitly “considering” GHG emissions from HG’s imported LNG, not regulating
    GHG emissions extra-territorially. Further, the burden associated with
    “considering” out-of-state GHG emissions is minimal compared to the local
    benefit at stake: the constitutional protection of a clean and healthful
    environment.
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    “statewide greenhouse gas emissions to levels at or below the
    best estimations and updates of the inventory of greenhouse gas
    emissions estimates for 1990.”      Act 234, H.B. 226, 24th Leg.,
    Reg. Sess. (2007) (enacted), available at
    https://www.capitol.hawaii.gov/session2007/
    bills/GM1005_.PDF, also available at https://perma.cc/TH44-RFPQ.
    To that end, Act 234 established the Greenhouse Gas Emissions
    Reduction Task Force “to prepare a work plan and regulatory
    scheme for implementing the maximum practically and technically
    feasible and cost-effective reductions in greenhouse gas
    emissions from sources or categories of sources of greenhouse
    gases to achieve the statewide greenhouse gas emissions limits
    by 2020.”    Id.   The legislature specifically directed the Task
    Force to craft “[r]ecommendations to minimize ‘leakage’ or a
    reduction in emissions of greenhouse gases within the State that
    is offset by an increase in emissions of greenhouse gases
    outside the State. . . .”     Id. at PDF p. 11.    The Task Force’s
    work plan, in turn, “strongly insist[ed] the life-cycle impact
    of energy sources be considered in any adopted energy laws,”
    because “even though an energy technology may be relatively
    clean-burning within the boundaries of Hawaii, the process in
    which it is made elsewhere is also of importance.”        The
    Greenhouse Gas Emissions Reduction Task Force, Work Plan for
    Greenhouse Gas Emissions Reductions 14 (Dec. 30, 2009),
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    http://energy.hawaii.gov/wp-content/uploads/2016/03/2015-
    greenhouse-gas-program.pdf, also available at
    https://perma.cc/5EZQ-LK9Z.       Thus, since Act 234, part of this
    state’s GHG emission reduction strategy has included taking into
    account out-of-state GHG “leakage” resulting from our energy
    choices.11
    In this rate proceeding, HG and the PUC have largely
    disregarded any possible GHG emission leakage from imported LNG.
    The PUC’s geographic limitation in Order No. 35112 indicates
    that it did not intend to, and in fact did not, explicitly
    consider out-of-state LNG-related GHG emissions in discharging
    its duties under HRS § 269-6(b).          The PUC’s action was contrary
    to law and, therefore, an abuse of discretion.
    11    It is important to note that the EPA, California, and Oregon have all
    adopted, in some form, Argonne National Laboratory’s “Greenhouse gases,
    Regulated Emissions and Energy use in Transportation” (or “GREET”) Model, see
    https://greet.es.anl.gov/, also available at https://perma.cc/TQ7Q-XYGM, to
    calculate life-cycle GHG emissions. See Rocky Mountain Farmers Union v.
    Corey, 
    730 F.3d 1070
    , 1081-82 (9th Cir. 2013) (explaining California’s CA-
    GREET Model); Am. Fuel & Petrochemical Mfrs. v. O’Keeffe, 
    903 F.3d 903
    , 908-
    09 (9th Cir. 2018) (explaining Oregon’s OR-GREET model); and Regulation of
    Fuels and Fuel Additives: Renewable Fuel Standard Program (“RFS”), 
    72 Fed. Reg. 23900
    , 23907 (May 1, 2007) (codified at 40 C.F.R. pt. 80) (explaining
    how the EPA utilized GREET in calculating life-cycle GHG emissions for its
    RFS Program). California’s CA-GREET modeling can be found at
    https://ww2.arb.ca.gov/resources/documents/lcfs-pathway-certified-carbon-
    intensities, also available at https://perma.cc/U3VB-R898. Oregon’s OR-GREET
    modeling can be found by accessing the link for the “carbon intensity values”
    Excel worksheets located at
    https://www.oregon.gov/deq/aq/programs/Pages/Clean-Fuel-Pathways.aspx, also
    available at https://perma.cc/VLX9-AU3. The EPA’s RFS GREET modeling can be
    found at https://www.epa.gov/fuels-registration-reporting-and-compliance-
    help/lifecycle-greenhouse-gas-results, also available at
    https://perma.cc/647V-YVPA. Thus, life-cycle GHG emission information is
    available to participants. See also note 13, infra.
    32
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    Next, the PUC’s limited and perfunctory review of GHG
    emissions in this rate case is evident in the Greenhouse Gas
    Emissions section of its Decision and Order No. 35969.        Instead
    of making any independent factual findings concerning the GHG
    emissions of HG’s LNG-related projects, the PUC simply repeated
    HG’s representation (made in HG’s response to the Appellants’
    information request 49) that GHG emissions from its SNG plant
    will decrease where LNG displaces SNG.      There is no GHG
    emissions information about the LNG HG uses.       Therefore, the PUC
    could not have fulfilled its “affirmative duty ‘to reduce the
    State’s reliance on fossil fuels through energy efficiency and
    increased renewable energy generation,’” as HRS § 269-6(b)
    requires, because the PUC could not have “‘explicitly
    consider[ed]’ the effect of the State’s reliance on fossil fuels
    on the level of ‘greenhouse gas emissions.’”       MECO, 141 Hawaiʻi
    at 269 n.36, 408 P.3d at 21 n.36 (emphasis added).
    Further, as Appellants point out, the PUC did not conduct a
    “quantitative or qualitative analysis” that substantiates its
    finding that HG’s LNG projects will decrease GHG emissions.           In
    this way, this case is closely analogous to HELCO, 145 Hawaiʻi 1,
    
    445 P.3d 673
    .    In that case, HELCO sought the PUC’s review of an
    amended power purchase agreement (“Amended PPA”) between it and
    Hu Honua Bioenergy, LLC, in which Hu Honua would construct and
    operate a biomass-fueled energy production facility, and HELCO
    33
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    would purchase energy from the facility.       145 Hawaiʻi at 5-6, 445
    P.3d at 677-78.    LOL moved to intervene in order to assert its
    environmental interests in the project, but the PUC granted it
    participant status instead.     145 Hawaiʻi at 6, 445 P.3d at
    678.   The PUC limited LOL’s participation to addressing business
    aspects of the project (whether the energy price components
    properly reflect the cost of biomass fuel supply, and whether
    HELCO’s purchase power arrangements were prudent and in the
    public interest); LOL’s limited participation did not allow it
    to address environmental aspects of the project.       145 Hawaiʻi at
    7, 445 P.3d at 679.     As a result, HELCO and Hu Honua refused to
    answer LOL’s information requests concerning GHG emissions as
    beyond the scope of LOL’s participation.       145 Hawaiʻi at 8, 445
    P.3d at 680.
    The PUC in HELCO ultimately approved the Amended PPA.      145
    Hawaiʻi at 9, 445 P.3d at 681.     In its findings and conclusions,
    the PUC merely “restated HELCO’s representations that the
    biomass facility could potentially save approximately 15,700
    barrels of fuel per year and contribute to the State’s
    [renewable portfolio standard] goals,” but “it made no express
    findings or conclusions regarding the biomass facility’s GHG
    emissions.”    145 Hawaiʻi at 24, 445 P.3d at 696.     LOL appealed,
    arguing that the PUC did not explicitly consider GHG emissions
    34
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    in determining whether the costs of the Amended PPA were
    reasonable, in violation of HRS § 269-6(b), and that it was
    denied due process to protect its right to a clean and healthful
    environment due to the PUC’s limitation on its
    participation.    145 Hawaiʻi at 10, 445 P.3d at 682.
    In HELCO, this court held that the PUC needed to do more
    than restate HELCO’s representation about energy savings;
    instead, this court required the PUC to “substantiate this
    finding by addressing the hidden and long-term environmental and
    public health costs of reliance on energy produced at the
    proposed facility.”     145 Hawaiʻi at 24, 445 P.3d at
    696.   HELCO continued, “These costs include the ‘potential for
    increased air pollution as a result of GHG emissions’ directly
    attributed to energy generation at the facility, as well as GHG
    emissions produced at earlier stages in the production process,
    such as fuel production and transportation.”       Id. (citing MECO,
    141 Hawaiʻi at 263, 408 P.3d at 15).
    The HELCO court further noted that “[a]n agency’s findings
    should be ‘sufficient to allow the reviewing court to track the
    steps by which the agency reached its decision.’”        HELCO, 145
    Hawaiʻi at 11, 445 P.3d at 683.     Where they are not, a “remand
    pursuant to HRS § 91-14(g) is appropriate,” as the “agency’s
    findings are incomplete and provide no basis for review.”        145
    35
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    Hawaiʻi at 24, 445 P.3d at 696 (citations omitted).       In this
    case, the PUC similarly restated HG’s representation that its
    LNG projects will decrease GHG emissions, but it did not
    substantiate those findings in a manner that would allow this
    court to track the steps by which it reached its
    decision.
    The PUC contends that this case was just a rate case, and
    that the PUC had already fulfilled the requirements of HRS
    § 269-6(b) in the earlier dockets approving the LNG
    projects.    The PUC, however, specifically granted the Appellants
    participant status to address HRS § 269-6(b) with respect to GHG
    emissions.    Also, MECO stated that “HRS § 269-6(b)’s requirement
    to reduce reliance on fossil fuels and to consider greenhouse
    gas emissions applies to the fulfillment of all of the
    Commission’s duties.”     141 Hawaiʻi at 263, 408 P.3d at
    15 (emphasis added).     See also MECO, 141 Hawaiʻi at 269, 408 P.3d
    at 21 (“[T]he consideration of whether energy charges are
    reasonable or a business arrangement is prudent would
    necessarily involve an evaluation of the hidden and long-term
    costs of the activities . . . , including consideration of the
    potential for harmful greenhouse gas emissions.”).
    In this case, the PUC did not fulfill the statutory
    requirements of HRS § 269-6(b) because (1) it did not explicitly
    consider all of the GHG emission impacts of HG’s LNG projects,
    36
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    having erroneously previously determined that the out-of-state
    GHG emissions from HG’s imported LNG were beyond the scope of
    the rate proceeding, and, (2) upon considering the limited
    evidence submitted in this case, merely restating, without
    substantiating, HG’s representation that its LNG projects would
    decrease GHG emissions.
    C.    The PUC’s limitations in sub-Issue No. 1h violated
    Appellants’ due process rights.
    The Appellants argue that the PUC violated their due
    process rights, under the Fifth Amendment to the United States
    Constitution, as well as under article I, section 5 of the
    Hawaiʻi State Constitution, by denying them a meaningful
    opportunity to be heard.      “The basic elements of procedural due
    process of law require notice and an opportunity to be heard at
    a meaningful time and in a meaningful manner before governmental
    deprivation of a significant property interest.”           HELCO, 145
    Hawaiʻi at 25, 445 P.3d at 697 (citations omitted).           Under MECO,
    141 Hawaiʻi 249, 
    408 P.3d 1
    , Appellants possess a protected
    property interest in a clean and healthful environment under
    article XI, section 9 of the Hawaiʻi State Constitution, which
    states:
    Each person has the right to a clean and healthful
    environment, as defined by laws relating to environmental
    quality, including control of pollution and conservation,
    protection and enhancement of natural resources. Any
    person may enforce this right against any party, public or
    private, through appropriate legal proceedings, subject to
    reasonable limitations and regulation as provided by law.
    37
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    HRS § 269-6(b) is a “law relating to environmental quality,” and
    it requires the PUC to “explicitly consider, quantitatively or
    qualitatively, the effect of the State’s reliance on fossil
    fuels on . . . greenhouse gas emissions.”
    Appellants acknowledge that MECO held that the PUC “has the
    authority to set limitations in conducting the proceedings so
    long as the procedures sufficiently afford an opportunity to be
    heard at a meaningful time and in a meaningful manner” in a
    proceeding before it, citing MECO, 141 Hawaiʻi at 270, 408 P.3d
    at 22.   They point to HELCO, however, as a case in which the
    PUC’s limitations deprived participants of a meaningful
    opportunity to be heard.     Specifically, they state that this
    court in HELCO found a due process violation where the PUC
    limited participants to addressing two economic sub-issues, when
    the participants’ asserted interest was environmental, not
    economic.    Analogizing HELCO to their case, the Appellants argue
    that the PUC violated their due process rights by limiting the
    scope of sub-Issue No. 1h to exclude Appellants’ interest in the
    full consideration of the GHG emission impact of HG’s imported
    LNG.
    The PUC counters that it framed sub-Issue No. 1h to
    “mirror” the language of HRS § 269-6(b); therefore, it argues,
    the Appellants’ due process rights were not violated.        Next,
    38
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    both HG and the PUC argue that Appellants were afforded a
    meaningful opportunity to be heard in this rate proceeding, as
    Appellants participated extensively by submitting joint
    information requests, written testimony and exhibits, responses
    to HG’s information requests, and opening and reply briefs on
    sub-Issue No. 1h.
    In this case, as discussed supra, Section IV.B, the PUC
    limited its consideration of GHG emissions to those within the
    boundaries of the state, truncating Appellants’ property
    interest in a manner not required under the plain language of
    HRS § 269-6(b), and in a manner contrary to MECO.        See 141
    Hawaiʻi at 268, 408 P.3d at 20 (“[I]t is commonly understood that
    ‘[a]ir pollution is transient’ and is ‘heedless’ of even ‘state
    boundaries.’”) (citation omitted).      In limiting the Appellants’
    constitutionally protected interest in this way, the PUC
    violated the Appellants’ due process rights.       See HELCO, 145
    Hawaiʻi at 25-26, 445 P.3d at 697-98 (holding that the PUC’s
    limitation upon LOL’s participation to exclude its asserted
    interest in a clean and healthful environment violated LOL’s due
    process rights).    Therefore, the PUC’s argument that it properly
    framed sub-Issue No. 1h to “mirror” HRS § 269-6(b) fails.
    Further, when the Appellants’ interest is limited in this way,
    the “opportunities to be heard” cannot be said to be meaningful.
    39
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    D.    The PUC did not abuse its discretion in adjudicating HG’s
    rate case rather than proceeding through rule-making.
    Also at issue in this case is whether the PUC improperly
    created GHG emissions policy through the ad hoc adjudication of
    HG’s rate case, where such policy should develop through the
    rule-making procedures of HRS chapter 91, Hawaiʻi’s
    Administrative Procedure Act (“HAPA”).12         This court has
    previously explained the difference between rule-making and
    adjudication as follows:       “Rule making is agency action
    governing the future conduct either of groups or persons or of a
    single individual; it is essentially legislative in nature.
    . . . Adjudication, conversely, is concerned with the
    determination of past and present rights and liabilities.”
    Foster Vill. Cmty. Ass’n, 4 Haw. App. at 475-77, 667 P.2d at
    857-58.   The parties acknowledge that “agencies are allowed the
    broad discretion to choose whether to develop policy by rule-
    making or adjudication.”       In re Application of HECO, 81 Hawaiʻi
    12    HAPA was enacted “to provide a uniform administrative procedure for all
    state and county boards, commissions, departments or offices which would
    encompass the procedure of rule making and adjudication of contested cases.”
    Foster Vill. Cmty. Ass’n v. Hess, 
    4 Haw. App. 463
    , 475, 
    667 P.2d 850
    , 857
    (1983) (citation omitted). Chapter 91 contains procedures for state agencies
    to follow with respect to rule-making. HRS § 91-1 (2012) defines a rule as
    “each agency statement of general or particular applicability and future
    effect that implements, interprets, or prescribes law or policy, or describes
    the organization, procedure, or practice requirements of any agency.” HRS
    § 91-3 (2012) requires an “adopting agency,” “prior to the adoption of any
    rule authorized by law,” to, among other things, “[g]ive at least thirty
    days’ notice for a public hearing,” and “[a]fford all interested persons
    opportunity to submit data, views, or arguments, orally or in writing.”
    40
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    at 468, 
    918 P.2d at 570
     (citation omitted).          However,
    “policymaking by adjudication is an abuse of discretion if:              (1)
    it is used to ‘circumvent the requirements of the Administrative
    Procedure Act’ by amending a recently amended rule or bypassing
    a pending rule-making proceeding; or (2) ‘an agency’s sudden
    change of direction leads to undue hardship for those who had
    relied on past policy.’”       
    Id.
     (citation omitted).
    In this case, only the second form of abuse of discretion
    is at issue, as there is no rule, recently amended rule, or
    pending rule-making proceeding concerning how the PUC shall
    measure GHG emissions.13      As to when an agency engages in a
    13    We note other states, as well as the federal government, have developed
    rules for measuring GHG emissions using a life-cycle analysis, at least for
    transportation fuels. See, e.g., Clean Air Act § 211(o), 
    42 U.S.C. § 7545
    (o)(1)(H) (2009) (defining “lifecycle greenhouse gas emission” as the
    “aggregate quantity of greenhouse gas emissions (including direct emissions
    and significant indirect emissions such as significant emissions from land
    use changes), as determined by the Administrator, related to the full fuel
    lifecycle, including all stages of fuel and feedstock production and
    distribution, from feedstock generation or extraction through the
    distribution and delivery and use of the finished fuel to the ultimate
    consumer, where the mass values for all greenhouse gases are adjusted to
    account for their relative global warming potential”); 
    Cal. Code Regs. tit. 17, § 95481
    (a)(38) (2020) (defining “Life Cycle Greenhouse Gas Emissions” as
    “aggregate quantity of greenhouse gas emissions (including direct emissions
    and significant indirect emissions, such as significant emissions from land
    use changes), as determined by the Executive Officer, related to the full
    fuel life cycle, including all stages of fuel and feedstock production and
    distribution, from feedstock generation or extraction through the
    distribution and delivery and use of the finished fuel to the ultimate
    consumer, where the mass values for all greenhouse gases are adjusted to
    account for their relative global warming potential”); Or. Rev. Stat.
    § 468A.266(2)(b) (2018) (authorizing the Oregon Environmental Quality
    Commission to adopt “[s]tandards for greenhouse gas emissions attributable to
    the fuels throughout the lifecycles of the fuels, including but not limited
    to emissions from the production, storage, transportation and combustion of
    the fuels and from changes in land use associated with the fuels”).
    As indicated in note 11, supra, the EPA, California, and Oregon have
    all adopted models to calculate life-cycle GHG emissions. We also note with
    (continued. . .)
    41
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    “sudden change of direction lead[ing] to undue hardship for
    those who had relied on past policy,” two cases guide this
    court’s inquiry:     Application of Hawaiian Elec. Co., 
    66 Haw. 538
    , 
    669 P.2d 148
     (1983) (“Lifeline Rates”), and In re
    Application of HECO, 81 Hawaiʻi 459, 
    918 P.2d 561
    .           Both are
    cases in which this court held the PUC did not abuse its
    discretion by proceeding through adjudication rather than rule-
    making.
    In Lifeline Rates, HECO initiated a rate case seeking to
    increase its rates.      66 Haw. at 539, 669 P.2d at 150.        Two
    community groups intervened and asked the PUC to establish
    lifeline rates under a federal statute.          Id.   Thereafter, the
    PUC treated the case as a contested case, placing the burden of
    proof on intervenors, holding an evidentiary hearing, and
    entering detailed findings of fact and conclusions of law before
    declining to implement lifeline rates.         66 Haw. at 540, 669 P.2d
    (continued . . .)
    approval that the PUC has recently asked the Hawaii Natural Energy Institute
    (“HNEI”) to “conduct a study to provide estimates for the lifecycle
    greenhouse gas (GHG) emissions of various energy products and production
    technologies in Hawaii,” including SNG and LNG, to assist it in decision
    making under HRS § 269-6(b). The PUC asked HNEI to develop the “boundary
    conditions” to “explicitly identify processes to be included” in a life-cycle
    analysis, such as “mining, transportation of raw and finished materials,
    manufacturing, electricity production, and end-of-life disposal.” Letter
    from James P. Griffin, Ph.D, chair of the PUC, et al. to Richard E.
    Rocheleau, Director of HNEI (Aug. 28, 2019), available at
    https://puc.hawaii.gov/wp-content/uploads/2019/08/08.28.19-Letter-to-
    Director-Rocheleau_Lifecycle-Analysis-Task-Force-Request.pdf, also available
    at https://perma.cc/38NK-MCWK.
    42
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    at 150.    The intervenors appealed, arguing “that the [PUC]
    should have somehow told them what they must prove.”            66 Haw. at
    540, 669 P.2d at 151.      This court framed the intervenors’
    argument to be “that it was error for the [PUC] to proceed by
    way of a contested case hearing (although they did not object
    thereto) and that the [PUC] instead should have adopted rules
    pursuant to § 91-3, HRS.”       66 Haw. at 541, 669 P.2d at 151.
    This court affirmed the PUC’s order and rejected the
    intervenors’ argument as follows:
    In this case, the appellants accepted, without objection,
    the contested case procedure and, in fact, took their
    appeal based on statutes which provide for appeals from an
    “order” in a contested case. That being so, we will not
    here entertain their alternative contention that the
    “order” entered was instead a “rule” which should have been
    differently handled.
    Moreover, if what appellants desired was the promulgation
    of a “rule” by the PUC, they should have proceeded by
    petition for the adoption of such rule pursuant to § 91-6,
    HRS. The agency then would have been obliged within 30
    days to either deny the petition, stating its reasons in
    writing for the denial, or initiate proceedings in
    accordance with § 91-3, HRS.
    Id.
    Similarly, in In re Application of HECO, this court again
    rejected community intervenors’ argument on appeal that the PUC
    impermissibly engaged in rule-making in the guise of
    adjudicating a contested case.        81 Hawaiʻi 459, 
    918 P.2d 561
    .       In
    that case, HECO applied to the PUC for permission to commit
    funds to construct high-voltage overhead transmission lines.              81
    Hawaiʻi at 461, 
    918 P.2d at 563
    .          The intervenors argued, among
    43
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    other things, that the transmission lines should be placed
    underground.    81 Hawaiʻi at 463, 
    918 P.2d at 565
    .        In its
    Decision and Order, the PUC declined to require HECO to place
    its transmission lines underground,
    unless (1) there [was] a compelling reason (which outweighs
    the cost) to place the lines underground or (2) there is a
    stated public policy requiring the lines to be laid
    underground or (3) the ratepayers as a whole consent to
    bear the high cost of putting the lines underground. . . .
    That placing the transmissions lines overhead may obstruct
    one’s view plane, in and of itself, is not sufficient cause
    to require the ratepayers to bear the cost of laying the
    lines underground.
    81 Hawaiʻi at 464, 
    918 P.2d at 566
    .
    The intervenors appealed, arguing that the “PUC violated
    HAPA by failing to properly promulgate rules to establish when
    transmission lines will be placed underground.”          81 Hawaiʻi at
    465, 
    918 P.2d at 567
     (footnote omitted).         In other words, they
    argued “that what would qualify as ‘additional justification’ or
    criteria is clearly a statement of policy by the PUC, thereby
    requiring a rule-making proceeding prior to a contested case
    hearing under HAPA.”     81 Hawaiʻi at 466, 
    918 P.2d at 568
    .
    After analogizing the intervenor’s case to Lifeline Rates,
    this court similarly concluded that no undue hardship existed,
    because (1) intervenors participated in the contested case
    without objection; (2) they took their appeal from the PUC’s
    order pursuant to HRS §§ 91-14 and 269-16(f); (3) they should
    have proceeded by petition for the adoption of a rule under HRS
    44
    **   FOR PUBLICATION IN WEST’S HAWAIʻI REPORTS AND PACIFIC REPORTER   **
    § 91-6 if the promulgation of a rule was what they desired; (4)
    the contested case process afforded them extensive procedural
    opportunities to support their position; and (5) the PUC entered
    detailed findings of fact and conclusions of law.        In re
    Application of HECO, 81 Hawaiʻi at 470-71, 
    918 P.2d at 572-73
    (footnotes omitted).
    Similarly, in this case, the Appellants participated in the
    contested case format without objection (by filing their motions
    to intervene); took their appeal under statutes governing
    appeals of contested case orders issued by the PUC, HRS §§ 91-14
    (2012 & Supp. 2016) and 269-15.5 (2007 & Supp. 2016); should
    have initiated a rule-making petition if that is what they
    desired (as it appeared in LOL’s testimony early on that it
    sought to have the PUC adopt the CAS methodology for measuring
    GHG emissions); and were afforded the procedural benefits
    (though limited) of participating in a contested case, through
    the opportunities to, among other things, propound information
    requests to HG and to brief sub-Issue No. 1h.       Lastly, the PUC
    entered detailed findings of fact and conclusions of law.        Thus,
    under both Lifeline Rates and In re Application of HECO, the
    Appellants “cannot now be heard to complain that they suffered
    undue hardship” due to whatever perceived rule-making they
    believe the PUC engaged in.     81 Hawaiʻi at 471, 
    918 P.2d at
    573
    45
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    (footnote omitted).     In sum, the PUC did not abuse its
    discretion in adjudicating HG’s rate case.
    E.    Native Hawaiian traditional and customary rights
    The Appellants allege that the PUC did not fulfill its
    constitutional obligation to protect KLM’s native Hawaiian
    customary and traditional rights under article XII, section 7 of
    the Hawaiʻi Constitution, which provides the following:
    The State reaffirms and shall protect all rights,
    customarily and traditionally exercised for subsistence,
    cultural and religious purposes and possessed by ahupuaʻa
    tenants who are descendants of native Hawaiians who
    inhabited the Hawaiian Islands prior to 1778, subject to
    the right of the State to regulate such rights.
    As indicated above, Appellants assert various impacts to native
    Hawaiian cultural practices.
    In Matter of Conservation District Use Application HA-3568,
    143 Hawaiʻi 379, 
    431 P.3d 752
     (2018) (“Mauna Kea II”), we
    reaffirmed “the State’s obligation to protect the reasonable
    exercise of customary and traditionally exercised rights
    of Hawaiians to the extent feasible.”         143 Hawaiʻi at 395, 431
    P.3d at 768, citing Public Access Shoreline Hawaii v. Hawaiʻi
    Cty. Planning Comm’n, 79 Hawaiʻi 425, 450 n.43, 
    903 P.2d 1246
    ,
    1271 n.43 (1995).
    Because the PUC improperly curtailed Appellants’
    substantive participation, the record is not sufficiently
    46
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    developed for us to address this issue.         On remand, the PUC
    should consider its constitutional obligations.
    F.    The State’s public trust resources
    Appellants also argue that the PUC failed to fulfill its
    affirmative obligations as a public trustee over the state’s
    natural resources under article XI, section 1 of the Hawaiʻi
    State Constitution, which provides the following:
    For the benefit of present and future generations, the
    State and its political subdivisions shall conserve and
    protect Hawaii’s natural beauty and all natural resources,
    including land, water, air, minerals and energy sources,
    and shall promote the development and utilization of these
    resources in a manner consistent with their conservation
    and in furtherance of the self-sufficiency of the State.
    All public natural resources are held in trust by the State
    for the benefit of the people.
    As we reiterated in Mauna Kea II, a state agency must
    perform its functions in a manner that fulfills the State’s
    affirmative obligations under the Hawaiʻi constitution.           143
    Hawaiʻi at 387, 431 P.3d at 760.         We also note, however, that HG
    and the PUC’s reliance on the ICA’s decision in In re Molokai
    Pub. Utils., 127 Hawaiʻi 234, 
    277 P.3d 328
     (App. 2012), to argue
    that a rate case does not trigger a state agency’s public trust
    obligations where there is no change in use of the public trust
    resource, is misplaced.      That case was effectively overruled by
    this court’s decision in Ching v. Case, 145 Hawaiʻi 148, 177–78,
    
    449 P.3d 1146
    , 1175–76 (2019), in which we held that the state
    has a continuing duty to monitor the use of trust property, even
    47
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    if the use of the property has not changed.       See also Lānaʻians
    for Sensible Growth v. Land Use Comm’n, 
    2020 WL 2511131
    , at *7
    (Haw. May 15, 2020) (noting that the LUC possesses a continuing
    constitutional obligation to ensure that measures it imposes to
    protect public trust resources are implemented and complied
    with).   Thus, the PUC's constitutional obligations are ongoing,
    regardless of the nature of the proceeding.
    Again, because the PUC improperly curtailed Appellants’
    substantive participation, the record is not sufficiently
    developed for us to address this issue.       On remand, the PUC
    should consider its constitutional obligations.
    V.   Conclusion
    For the foregoing reasons, we vacate the PUC’s Decision and
    Order No. 35969 and remand this case to the PUC for further
    proceedings consistent with this opinion.
    Lance D. Collins                        /s/ Mark E. Recktenwald
    for Appellants
    /s/ Paula A. Nakayama
    David Y. Nakashima
    (Jeffrey T. Ono and                     /s/ Sabrina S. McKenna
    John E. Dubiel with him
    on the briefs)                          /s/ Richard W. Pollack
    for Appellee Hawaiʻi Gas
    Andrew D. Goff
    (Clare E. Connors and
    Bryan C. Yee with him
    on the briefs)
    for Appellee Public
    Utilities Commission
    48