OPINION
COMPTON, Justice.
The Alaska Public Utilities Commission (APUC) issued a certificate of public convenience and necessity for the Healy Clean Coal Project (HCCP), a coal-fired power plant in Healy, Alaska. The Alaska Federation for Community Self-Reliance, Trustees for Alaska, Northern Alaska Environmental Center and Dave Lacey (collectively, “the Federation”) challenge APUC’s decision. The Federation asserts that APUC failed to consider all factors bearing on the public interest, including the environmental “impacts” or “costs” and the costs of the federal and state subsidies allocated to the project. Additionally, the Federation seeks to invalidate APUC’s decision because two APUC commissioners failed to participate in the final decision.
I.
FACTUAL AND PROCEDURAL BACKGROUND
In the mid-1980s the United States Department of Energy (DOE) inaugurated its Clean Coal Technology Program as a technology development experiment co-funded by government and industry. It was designed to “demonstrate a new generation of innovative coal processes in a series of full-scale ‘showcase’ facilities built across the country.” The facilities would “comply with environmental, health, and safety requirements at costs that [would] keep coal competitive in the market place.” DOE selected HCCP for participation in its demonstration program. HCCP is primarily a conventional coal-fired steam electric generating plant, designed to demonstrate two innovative technologies: advanced coal combustors and advanced emission control technology. HCCP will be located near Denali National Park.
HCCP will be owned by Alaska Industrial Development and Export Authority (AIDEA) and operated by Golden Valley Electric Association, Inc. (GVEA). AIDEA and GVEA negotiated an “Agreement for the Sale and Purchase of the Electric Capability of the [HCCP].” GVEA is to buy the power produced by HCCP. GVEA provides generation, transmission and distribution services to over 27,000 utility customers in Fairbanks, North Pole, Delta, Nenana, Anderson, Healy, and Cantwell.
There is government support for HCCP. DOE committed nearly $94 million to the project. The Alaska Legislature appropriated $25 million, plus the interest on that sum, to AIDEA for the design and construction of HCCP. Ch. 208, § 143, SLA 1990. Additionally, it authorized AIDEA to issue bonds for HCCP in a principal amount not to exceed $85 million. Ch. 123, § 28, SLA 1990.
Because AIDEA will be selling power generated by HCCP, it will be classified as a “public utility.” AS 42.05.720(4)(A). Alaska Statute 42.05.221 provides that a public utility must obtain a certificate of public convenience and necessity to provide a utility service. Additionally, AS 42.05.431(b) requires advance approval by APUC of a wholesale power agreement between public utilities, such as the power sales agreement between AIDEA and GVEA.
In December 1991 AIDEA filed an application with APUC for a certificate of public convenience and necessity to own HCCP. That same month GVEA filed an application with APUC for approval of the proposed power sales agreement. In beginning its examination of the HCCP applications, APUC gave all parties the opportunity to brief the issue of whether it had jurisdiction to consider the “environmental externalities.” The applicants specifically asked APUC to confirm that environmental externalities need not be addressed in the current proceedings. The Federation argued that APUC should consider the project’s environmental costs in deciding whether to issue a certificate. APUC’s staff concluded that “[APUC] has the legal authority to consider and include the costs and benefits associated with environmental externalities during a ratemaking proceeding, when determining whether a certificate should be granted, or whether a power sales agreement should be approved.” Additionally, the staff opined that public policy supports investigation into the environmental externalities.
In May 1992 three of the five APUC commissioners rejected the staffs recommended approach. APUC ordered that absent an express direction from the legislature, “environmental externalities will not be considered in this proceeding.” The two remaining commissioners agreed with the staff that APUC should consider HCCP’s environmental impacts in its decision whether to grant the certificate as “required for the public necessity.”
The Federation moved for reconsideration of the order. The motion was denied. The Federation next took an appeal to the superior court. AS 42.05.551(a); AS 44.62.560-
.570; Appellate Rule 602(a)(2). The- superior court stayed the appeal while APUC completed its remaining certification deliberations. In July 1992 APUC held an evidentia-ry hearing in which four commissioners participated. The three commissioners who voted against considering the project’s environmental costs participated in the final certification order. Two of them decided to issue the certificate. In a lengthy dissenting opinion, the remaining commissioner objected to issuing the certificate without further study. The two commissioners who had previously dissented from the order refusing to consider environmental externalities did not participate in APUC’s final decision, although one of them actively participated in the hearing.
Appellant Dave Lacey moved unsuccessfully for reconsideration of APUC’s final licensing decision. The Federation then timely took a second appeal to the superior court. The superior court consolidated that appeal with the Federation’s first appeal. One procedural argument raised in the Federation’s briefs was that the certificate was invalid because it lacked the requisite majority vote of the five commissioners who participated in the overall certification proceeding. Although it rejected that argument, the superi- or court raised a related issue: whether the two commissioners who declined to participate in the final certification decision violated a legal duty as sworn public officers to participate. Following oral argument, the superior court expressed its personal outrage that the two commissioners had abstained from participating for no reason articulated in the record, but held that it could find no relevant law on the issue. Thus it sustained APUC’s decision.
The superior court also rejected the Federation’s position that the HCCP certification proceeding requires consideration of the project’s environmental impacts. Although the court opined that environmental externalities should be considered, it stated that APUC is not required to consider them.
This appeal followed. The superior court issued an order granting the Federation’s motion to stay issuance of HCCP’s certificate pending this court’s decision on the Federation’s appeal. On February 1, 1994, we granted the parties’ joint motion for an expedited appeal prior to the expected start of construction, which was May 1, 1994. On April 28 we affirmed the judgment of the superior court. Additionally, we vacated the superior court’s order granting the Federation’s motion to stay the APUC’s issuance of the certificate of public convenience and necessity. In this opinion we articulate the bases for our April 28 order.
II.
DISCUSSION
A. STANDARD OF REVIEW.
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OPINION
COMPTON, Justice.
The Alaska Public Utilities Commission (APUC) issued a certificate of public convenience and necessity for the Healy Clean Coal Project (HCCP), a coal-fired power plant in Healy, Alaska. The Alaska Federation for Community Self-Reliance, Trustees for Alaska, Northern Alaska Environmental Center and Dave Lacey (collectively, “the Federation”) challenge APUC’s decision. The Federation asserts that APUC failed to consider all factors bearing on the public interest, including the environmental “impacts” or “costs” and the costs of the federal and state subsidies allocated to the project. Additionally, the Federation seeks to invalidate APUC’s decision because two APUC commissioners failed to participate in the final decision.
I.
FACTUAL AND PROCEDURAL BACKGROUND
In the mid-1980s the United States Department of Energy (DOE) inaugurated its Clean Coal Technology Program as a technology development experiment co-funded by government and industry. It was designed to “demonstrate a new generation of innovative coal processes in a series of full-scale ‘showcase’ facilities built across the country.” The facilities would “comply with environmental, health, and safety requirements at costs that [would] keep coal competitive in the market place.” DOE selected HCCP for participation in its demonstration program. HCCP is primarily a conventional coal-fired steam electric generating plant, designed to demonstrate two innovative technologies: advanced coal combustors and advanced emission control technology. HCCP will be located near Denali National Park.
HCCP will be owned by Alaska Industrial Development and Export Authority (AIDEA) and operated by Golden Valley Electric Association, Inc. (GVEA). AIDEA and GVEA negotiated an “Agreement for the Sale and Purchase of the Electric Capability of the [HCCP].” GVEA is to buy the power produced by HCCP. GVEA provides generation, transmission and distribution services to over 27,000 utility customers in Fairbanks, North Pole, Delta, Nenana, Anderson, Healy, and Cantwell.
There is government support for HCCP. DOE committed nearly $94 million to the project. The Alaska Legislature appropriated $25 million, plus the interest on that sum, to AIDEA for the design and construction of HCCP. Ch. 208, § 143, SLA 1990. Additionally, it authorized AIDEA to issue bonds for HCCP in a principal amount not to exceed $85 million. Ch. 123, § 28, SLA 1990.
Because AIDEA will be selling power generated by HCCP, it will be classified as a “public utility.” AS 42.05.720(4)(A). Alaska Statute 42.05.221 provides that a public utility must obtain a certificate of public convenience and necessity to provide a utility service. Additionally, AS 42.05.431(b) requires advance approval by APUC of a wholesale power agreement between public utilities, such as the power sales agreement between AIDEA and GVEA.
In December 1991 AIDEA filed an application with APUC for a certificate of public convenience and necessity to own HCCP. That same month GVEA filed an application with APUC for approval of the proposed power sales agreement. In beginning its examination of the HCCP applications, APUC gave all parties the opportunity to brief the issue of whether it had jurisdiction to consider the “environmental externalities.” The applicants specifically asked APUC to confirm that environmental externalities need not be addressed in the current proceedings. The Federation argued that APUC should consider the project’s environmental costs in deciding whether to issue a certificate. APUC’s staff concluded that “[APUC] has the legal authority to consider and include the costs and benefits associated with environmental externalities during a ratemaking proceeding, when determining whether a certificate should be granted, or whether a power sales agreement should be approved.” Additionally, the staff opined that public policy supports investigation into the environmental externalities.
In May 1992 three of the five APUC commissioners rejected the staffs recommended approach. APUC ordered that absent an express direction from the legislature, “environmental externalities will not be considered in this proceeding.” The two remaining commissioners agreed with the staff that APUC should consider HCCP’s environmental impacts in its decision whether to grant the certificate as “required for the public necessity.”
The Federation moved for reconsideration of the order. The motion was denied. The Federation next took an appeal to the superior court. AS 42.05.551(a); AS 44.62.560-
.570; Appellate Rule 602(a)(2). The- superior court stayed the appeal while APUC completed its remaining certification deliberations. In July 1992 APUC held an evidentia-ry hearing in which four commissioners participated. The three commissioners who voted against considering the project’s environmental costs participated in the final certification order. Two of them decided to issue the certificate. In a lengthy dissenting opinion, the remaining commissioner objected to issuing the certificate without further study. The two commissioners who had previously dissented from the order refusing to consider environmental externalities did not participate in APUC’s final decision, although one of them actively participated in the hearing.
Appellant Dave Lacey moved unsuccessfully for reconsideration of APUC’s final licensing decision. The Federation then timely took a second appeal to the superior court. The superior court consolidated that appeal with the Federation’s first appeal. One procedural argument raised in the Federation’s briefs was that the certificate was invalid because it lacked the requisite majority vote of the five commissioners who participated in the overall certification proceeding. Although it rejected that argument, the superi- or court raised a related issue: whether the two commissioners who declined to participate in the final certification decision violated a legal duty as sworn public officers to participate. Following oral argument, the superior court expressed its personal outrage that the two commissioners had abstained from participating for no reason articulated in the record, but held that it could find no relevant law on the issue. Thus it sustained APUC’s decision.
The superior court also rejected the Federation’s position that the HCCP certification proceeding requires consideration of the project’s environmental impacts. Although the court opined that environmental externalities should be considered, it stated that APUC is not required to consider them.
This appeal followed. The superior court issued an order granting the Federation’s motion to stay issuance of HCCP’s certificate pending this court’s decision on the Federation’s appeal. On February 1, 1994, we granted the parties’ joint motion for an expedited appeal prior to the expected start of construction, which was May 1, 1994. On April 28 we affirmed the judgment of the superior court. Additionally, we vacated the superior court’s order granting the Federation’s motion to stay the APUC’s issuance of the certificate of public convenience and necessity. In this opinion we articulate the bases for our April 28 order.
II.
DISCUSSION
A. STANDARD OF REVIEW.
This court independently reviews APUC decisions. No deference is given to the superior court’s decision when it acts as an intermediate court of appeal.
Tesoro Alaska, Petroleum Co. v. Kenai Pipe Line Co.,
746 P.2d 896, 903 (Alaska 1987).
Whether the Alaska Public Utilities Act requires APUC to consider all of HCCP’s costs, including environmental impacts and public subsidies, in deciding if the service is “required for the public necessity,” involves a question of law which the court reviews de novo.
Handley v. State, Dep’t of Revenue,
838 P.2d 1231, 1233 (Alaska 1992). Additionally, whether a decision of APUC requires more than a quorum to transact business is a question of law which the court reviews de novo.
Id.
B. DETERMINATION OF THE PUBLIC CONVENIENCE AND NECESSITY DOES NOT REQUIRE THE APUC TO CONSIDER THE COSTS ASSOCIATED WITH PUBLIC SUBSIDIES OR ENVIRONMENTAL EXTERNALITIES.
Alaska Statute 42.05.221 requires a public utility to obtain a certificate of public conve
nience and necessity in order to provide a utility service.
Alaska Statute 42.05.221(a) provides in part:
A public utility may not operate and receive compensation for providing a commodity or service without first having obtained from the commission ... a certificate declaring that public convenience and necessity require or will require the service. ...
Alaska Statute 42.05.241 prohibits issuance of a certificate “unless the commission finds that the applicant is fit, willing and able to provide the utility services” and that the “services are required for the convenience and necessity of the public.” This section then permits APUC to “attach to the grant of [the certificate] the terms and conditions it considers necessary to protect and promote the public interest.”
The Federation contends that APUC violated its statutory duty to consider all factors bearing on the public “necessity” for HCCP or, in other words, on whether allowing certification of HCCP serves the “public interest.” The Federation asserts that “public necessity” suggests a more stringent threshold for project approval than “public interest,” but that both standards require consideration of a broad range of factors bearing on the overall public good.
Specifi
cally, it contends that APUC erred by refusing to consider the public costs of environmental impacts resulting from HCCP and the costs of the public subsidies on which it is dependent.
APUC responds that it is not required by law to consider factors outside its traditional area of jurisdiction. It argues that the environmental damage that is caused by electric generating plants for which society must pay, as well as costs associated with public subsidies, are not costs that have
in the past been included in the rates paid by users of the electricity. Since the traditional purview of utility regulatory commissions is the reasonableness of rates charged by utilities and paid by consumers, any additional costs to society at large are not within the traditional area of policy making that the legislatures have assigned to utility regulators.
It argues that the case law presented by the Federation merely supports a contention that APUC has the discretion to determine what factors are relevant to certification of a utility service. It claims that the case law does not support an interpretation of statutory authority that would
compel
an examination of factors which are outside the purview of traditional utility regulation. APUC concludes that it did “not err in deciding that it would not consider environmental ‘externalities’ unless specifically directed to do so by the legislature.”
Additionally, AIDEA posits that the public convenience and necessity requirement is directed only toward the authorization of a utility
service
and is inapplicable to the construction of a particular facility.
We agree that the language of AS 42.05.-221, which requires a showing of public convenience and necessity, is limited specifically to “services.” As the superior court noted, APUC only needs to make a determination whether there is a substantial need for a service. Similarly, the requirement of section 241 that APUC find the applicant to be “fit, willing and able to provide the utility services applied for” only requires the commission to focus on the applicant. Neither inquiry requires an exploration into the costs associated with environmental externalities or public subsidies not paid by consumers as part of the rate charged for the service. APUC is required only to determine whether the “service” is required for the public convenience and necessity and whether the applicant is fit, willing and able. This it has done. APUC’s decision is not invalid by its refusal to consider these costs.
Therefore, we affirm APUC’s certification determination.
C. A MAJORITY VOTE OF A STATUTORY QUORUM IS SUFFICIENT FOR APUC TO TRANSACT BUSINESS.
Two of the five APUC commissioners did not participate in the final certification decision.
The nonparticipating commissioners dissented from APUC’s prior order that held there would be no consideration of environmental externalities. One of the two did not participate in the evidentiary hearing leading to the final order. The other who abstained was an active participant in the hearing, asking questions almost to the end of the hearing.
The Federation asserts that the certificate for HCCP should be declared void because the two commissioners who did not participate in the voting had a legal duty to vote on the issue. It argues that this duty arises from the fact that they are “public officers” of the State of Alaska. AS 39.52.960(21)(B) (a member of a commission is a public officer). As public officers, the commissioners take a constitutional oath of office, pledging to “faithfully discharge” their duties to the “best” of their “ability.” AS 42.05.081; Alaska Const, art. XII, § 5. Additionally, the Federation analogizes the duty of the commissioners to vote to the duty of judges to
sit.
Amidon v. State,
604 P.2d 575, 577 (Alaska 1979) (“[A] judge has as great an obligation not to disqualify himself, when there is no occasion to do so, as he has to do so in the presence of valid reasons.”);
In re Ellis,
108 B.R. 262, 266 (D.Hawaii 1989) (a judge may not recuse herself simply because she does not want to hear the matter, because of the difficulty of the subject matter, or even because of calendar constraints). The Federation argues that “as public officers, APUC Commissioners should be bound by the same duty as Judges, absent a formal excuse based on sound reasons.”
It asserts that this will further public trust and promote governmental accountability by providing a record of official conduct.
APUC, AIDEA, and GVEA respond that even if the court finds the nonparticipation of the two commissioners wrongful, the requested relief of setting aside a decision of a statutory quorum of the commission is inappropriate.
We agree.
Alaska Statute 42.05.071 provides that “[tjhree members of the commission constitute a quorum for the transaction of business, for the performance of a duty, or for the exercise of a power of the commission.”
See
Henry M. Robert,
Robert’s
Rules of Order Newly Revised
§ 39 (Seott, Foresman & Co. 1990) [hereinafter
Robert’s Rules]
(“[A] quorum in an assembly is the number of members entitled to vote who must be present in order that business can be legally transacted. The quorum refers to the number of such members
present,
not the number actually voting on a particular question.”).
Furthermore, a majority of the quorum, can act for the entire body.
See Federal Trade Comm’n v. Flotill Prods., Inc.,
389 U.S. 179, 183, 88 S.Ct. 401, 404, 19 L.Ed.2d 398 (1967) (“The almost universally accepted common-law rule is ... in the absence of a contrary statutory provision, a majority of a quorum constituted of a simple majority of a collective body is empowered to act for the body.”); 1976 Formal Op.Att’y Gen. No. 14 (“[Wjhen only three members [of the Public Utilities Commission] are sitting a minimum of two members concurring is all that is required for the commission to act.”); 2 Am.Jur.2d
Administrative Law
§ 196 (1962) (“[UJnless a statute provides otherwise the generally accepted rule is that ... a majority of the quorum concurring is sufficient to take any particular action.”).
Where a statute is silent on the number of votes necessary for a body to take action, the common law states that a majority of the quorum is sufficient to transact the business of the body.
In this case, a statutory quorum was present. A majority of the required quorum voted. While it would have been preferable for all five commissioners to have voted, the nonparticipation of the two commissioners is not grounds for invalidating the decision of a majority of a statutory quorum.
As stated by APUC, “The subject matter of AS 42.05.071 is not a commissioner’s duty of participation. The subject matter of AS 42.05.071 is the specification of a minimum number of commissioners who must participate in a valid commission action on any matter before the commission.”
Therefore, APUC’s decision is not invalid on the ground asserted.
III.
CONCLUSION
APUC is not required to consider costs associated with environmental external-ities or public subsidies in its inquiry concerning whether a
service
is required for the public convenience and necessity, or whether an applicant is fit, willing and able to provide the service. It is only required to determine whether there is a substantial need for the service and whether the applicant is in fact fit, willing and able. Furthermore, while it might have been preferable for all APUC commissioners to have participated in the final certification decision, nonparticipation by two members does not invalidate a decision made by the majority of a statutory quorum. Therefore, we AFFIRM the decision of the superior court.
RABINOWITZ, Justice,
with whom BRYNER, Justice, pro tern., joins, dissenting.
I dissent from the majority’s conclusion that APUC’s responsibility for determining whether AIDEA should be granted a certificate of public convenience and necessity, pursuant to AS 42.05.221 and 42.05.241,
for the
Healy Clean Coal Project did not require APUC to consider environmental externalities.
Federal case law supports á contrary holding, to the effect that under AS 42.05.221 and AS 42.05.241 APUC is required to consider all factors bearing on the convenience and necessity of the public, including environmental costs or impacts. Like AS 42.05.221 and AS 42.05.241, § 7(e) of the Natural Gas Act of 1938, 15 U.S.C. § 717f(e), requires the Federal Energy Regulatory Commission
to find that a proposed service is or will be required by “public convenience and necessity”
before FERC can issue a certificate. Under this provision, FERC must consider
“all
factors bearing on the public interest.”
Federal Power Comm’n v. Transcontinental Gas Corp.,
365 U.S. 1, 8, 81 S.Ct. 435, 439, 5 L.Ed.2d 377 (1961) (quoting
Atlantic Refining Co. v. Public Serv. Comm’n,
360 U.S. 378, 391, 79 S.Ct. 1246, 1255, 3 L.Ed.2d 1312 (1959));
see also Cascade Natural Gas Corp. v. FERC,
955 F.2d 1412, 1421 (10th Cir.1992).
In
Transcontinental,
a single Federal Power Commission hearing officer held that he could not consider the effects of proposed utility services on air quality, contrary to recommendations by Federal Power Corn-mission staff. 365 U.S. at 5, 81 S.Ct. at 438. The full Federal Power Commission reviewed the decision, and held that it could consider effects on air quality under § 7.
Id.
at 5-6, 81 S.Ct. at 438. The United States Supreme Court agreed, holding that the Federal Power Commission had not exceeded its authority.
Id.
at 31, 81 S.Ct. at 451. The Court’s holding focused on preemption of facilities and price.
See id.
Yet in the absence of more explicit treatment, it is significant that the Court did not criticize the consideration, at either stage, of environmental factors. Indeed, the Court reiterated that the Federal Power Commission must consider
“all
factors bearing on the public interest.”
Id.
at 8, 81 S.Ct. at 439.
Although the majority acknowledges the federal case law in this area, it fails to cite any contrary decisions, from any jurisdiction, that construe similar language. It attempts to distinguish the relevant federal cases by noting that some rely on statutory language unlike the provisions governing APUC. I find this argument unpersuasive. Though the argument is ostensibly made in reference to
Transcontinental, United States v. Detroit & Cleveland Navigation Co.,
326 U.S. 236, 241, 66 S.Ct. 75, 77, 90 L.Ed. 38 (1945), and
Cascade,
the citations that follow the majori-
tj^s analysis on this point are to other eases.
The existence of these distinguishable federal cases does not change the fact that those courts that have considered the issue have held that the term “public convenience and necessity” includes all factors bearing on the public interest. It is notable that the majority ends its discussion of federal cases with a citation to
Henry v. Federal Power Commission,
513 F.2d 395 (D.C.Cir.1975), and implicitly acknowledges that
Henry
represents federal authority that cannot be distinguished.
The majority’s central holding is that APUC is required only to determine whether “service is required for the public convenience and necessity” and, focusing solely on the applicant, “whether the applicant is fit, willing and able.” It seems inconceivable that a particularized finding of fitness and ability can ever be made without a thorough explanation of the manner in which the applicant proposes to provide the service and the consequences that might result from provision of the service in that manner.
The majority also states that “APUC is required only to determine whether the ‘service’ is required for the public convenience and necessity.” This begs the question of what “public convenience and necessity” means. For the reasons discussed above, I believe that the federal courts are correct in holding that “public convenience and necessity” encompasses consideration of environmental externalities.
The two primary policy arguments that the majority advances in support of its interpretation can be termed “redundancy” and “uncertainty.” The majority suggests that there is no need for the state to consider environmental impacts, since the United States Department of Energy (DOE) is involved. DOE completed a final environmental impact statement for HCCP in December 1993. Yet DOE based its assessment on the need for innovative coal-based technology, the goal of the federal Clean Coal Technology Program. The question DOE asked was whether the costs of HCCP outweigh the national benefits of potentially developing new coal-based power-generation technologies. That is fundamentally different from the question APUC is required to answer: whether Alaska’s public convenience and necessity will be served by HCCP. Because the two inquiries are distinct, requiring APUC to consider environmental externalities would not be redundant. Moreover, I note that in some cases DOE or other federal agencies may not be involved. Under the majority opinion, environmental factors bearing on the public interest could then be overlooked altogether until after the proposed project has been certified.
As for the assertion that environmental consequences are too uncertain, and that “economically minded” agencies are incapable of considering environmental consequences, this seems overstated. The deci-sionmaking process can account for uncertainty or limited agency competence. Discounting for uncertainty is legitimate, so long as the agency makes a good-faith attempt to consider all issues affecting the public interest. And even if, as GVEA asserts, environmental externalities cannot be quantified, this does not mean they cannot be considered at all.
I am also unpersuaded by the majority’s emphasis on the word “service” in the statute. The provision of power is a “service,” and the consequences of providing that service include environmental damage.
APUC’s powers are to be “liberally construed to accomplish its stated purposes.” AS 42.05.141(a)(1). Under the rules of statutory construction, a grant of express authority carries with it all powers and duties incidental and necessary to exercise of the express authority. As APUC’s staff has noted:
The Commission has the authority and duty to ensure: (1) that rates charged are just and reasonable; (2) the service provided is safe and efficient and required for the public convenience and necessity; and (3) that the conservation of resources used in the generation of electric energy is promoted.
The power to consider environmental exter-nalities follows from these duties.