OPINION OF THE COURT BY
NAKAMURA, J.
We are asked to review a decision and order of the Public Utilities .Commission allowing a rate increase for telephone and related services provided by the Hawaiian Telephone Company. The Company sought specific approval of revised intrastate rate schedules it claimed were projected to increase intrastate revenues by approximately $47,600,000 and “produce [an] 8.6% rate of return on the average intrastate rate base for the test year 1982.” After lengthy contested proceedings, the Commission approved instead rate schedules it found would increase revenues by $27,121,000 and produce a 9.18% rate of return. The Company appeals, charging the Commission erred: (1) “in failing to find a fair rate of return,” (2) “in failing to provide the Company an opportunity to earn a fair return on its intrastate rate base,” (3) “by making an unsupported and unlawful ‘Separation Adjustment,’ ” and (4) “in awarding a rate increase sufficient only to produce an annual revenue increase of $27,121,000.” Finding no merit in the claims of error, we affirm the decision and order.
I.
A.
After filing the required notice of an intent to seek rate increases in early June of 1981, Hawaiian Telephone submitted an application for approval of revised rate schedules in August of
1981. The revised schedules, it claimed, were structured to generate increased intrastate revenues of $47,600,000, which in its estimation “represented] a 25% increase.”
The application came on the heels of the approval in June of 1981 by the Federal Communications Commission (FCC) of a 1980 agreement between American Telephone and Telegraph Company (AT&T) and Hawaiian Telephone purporting to represent a “resolution among the various interests involved of questions of jurisdictional separations, settlements, and rate integration for Hawaii.”
The agreement was spurred by the federal agency’s determination in 1972 that rates for interstate telecommunications services to and from Hawaii, which then were substantially higher than interstate rates on the mainland, should be integrated into the “U.S. Mainland domestic rate pattern” and the agency’s 1976 decisions that this was to be achieved in three phases and accompanied by “cost-based settlements based on prescribed jurisdictional separations procedures.”
The ordered integration was partially implemented by rate
reductions in 1976, 1977, and 1979. Full integration, however, was to come after the prescription of procedures to be applied in determining “jurisdictional separations and cost-based settlements” with respect to Hawaii. Thus, a Federal-State Joint Board was convened by the FCC to examine existing procedures for possible modification to suit the situation. But before the Board submitted its recommendation, AT&T and Hawaiian Telephone agreed they would request the Board to recommend and the FCC to decree that the method of separations described in the NARUC-FCC Separations Manual (Feb. 1971 ed.), which has been incorporated in the FCC’s rules, would apply.
The compact between the interstate and the intrastate carriers stipulated they would jointly seek sanction to delay full implementation of these procedures and full rate integration until 1985. The agreement also provided that cost-based settlements were to be effective from 1981 through 1984, but the local carrier was to receive “transitional supplements” during this period.
The
agreement called for parity thereafter in rates for telecommunications services to and from Hawaii and interstate rates on the mainland United States.
In accord therewith AT&T and Hawaiian Telephone moved in July of 1980 to have the Joint Board recommend the prescription of the NARUC-FCC Separations Manual for Hawaii and to have the FCC approve the agreement, asserting such actions would “avoid the need for further proceedings . .. and ... result in implementation of full rate integration in a manner that will serve the overall public interest.” Hawaiian Telephone sought the support of Hawaii’s Congressional delegation and the Governor in seeking such approval. But before endorsing the carriers’ pact, the Governor requested an explanation on how it would be of direct benefit to customers.
In responding to the pointed query, Hawaiian Telephone professed that the agreement provided a means to accomplish rate integration with minimum impact to Hawaii customers and “the accumulated cost to Hawaii and Mainland customers of delaying integration [would] be approximately $36 million compared to the $130 million in transition payments
which lessen the need for local rate increases.”
(Emphasis supplied).
Similar representations were made in a subsequent letter from a company vice-president to the Attorney General.
A formal expression of
State support was transmitted thereafter to the chairman of the FCC.
The federal regulatory agency “accepted and approved” the agreement in July of 1981.
B.
Hawaiian Telephone submitted its application for intrastate rate increases to the Public Utilities Commission on August 25, 1981. In accord with the mandate of Rule 8-3 of the Commission’s Rules of Practice and Procedure, the petition was accompanied by “written direct testimony” and exhibits purportedly sustaining the requested rate increase.
The Consumer Advocate of the State of Hawaii, whose duty it is to “represent, protect, and advance the interests of consumers of utility services,”
however, considered the submission wanting in essential respects and quickly moved for summary disposition of the application. He argued the testimony and exhibits neither established “cost justifications” nor reflected the Company’s “earn
ings results” on a county or divisional basis as mandated by the Commission’s rules. After overruling the Advocate’s motion for a finding of “insufficiency” and disposing of other preliminary matters, the Commission commenced a series of public hearings on Hawaiian Telephone’s plea for rate increases.
The utility proposed across-the-board price increases amounting to approximately thirty-five percent for most of the services it rendered the public and limited changes in rates and charges for other services. The Consumer Advocate maintained throughout the contested-case hearing, as he had earlier, that a need for rate increases had not been demonstrated. The large sums Hawaiian Telephone became entitled to in the form of “transitional supplements” under the recently approved agreement with AT&T were among the reasons urged for disallowing rate hikes.
At one point in the protracted proceedings, the Company summarized its case through the testimony of an officer and the exhibits presented in conjunction therewith. It averred therein that “the rate relief requested [was] $47.6 million which will produce a rate of return on the intrastate rate base [of $485 million] of only 8.6%.” (H.T.C. Exh. No. T-19, at 3-4). This estimate of necessary revenue, it explained, followed a determination “that a net operating income of $41.7 million would be required for intrastate operations in test year 1982.” (H.T.C. Exh. No. T-19, at 4). “The Commission, based on the foregoing, [deemed] it [unnecessary] to make a finding on ... a specific fair rate of return for the test year 1982.” P.U.C. Decision and Order No. 7412, at 96. And it approved new rate schedules designed to “produce an annual revenue increase of $27,121,000” and yield the “net operating income of $41,700,000 . .. requested by HTC.”
Id.
at 113. The disparity in estimates of additional revenue likely to generate the desired net income resulted in part from a finding that “[t]he intrastate rate base for test year 1982 [was] $454,129,000” rather than $485,000,000 as claimed by Hawaiian Telephone.
Id.
II.
Hawaiian Telephone argues the Commission committed reversible error when it approved rate increases calculated to “produce an annual revenue increase of $27,121,000” and yield a “net
operating income of $41,700,000.” The Commission, the Company claims, “adopted an unprecedented and unlawful method of determining the rate increase and then reduced the already inadequate award by the unsupported and unlawful use of a so-called ‘Separation Adjustment.’ ” The initial specification of error is that “[t]he Commission erred in failing to find a fair rate of return.” But we are not convinced this was error.
We are mindful, of course, that orthodoxy in public utility rate making suggests four sequential determinations should precede the ultimate rate decision; they are:
(1) what are the enterprise’s
gross utility revenues
under the rate structure examined; (2) what are its
operating expenses,
including maintenance, depreciation and all taxes, appropriately incurred to produce those gross revenues; (3) what utility property provides the service for which rates are charged and thus represents the base
(rate base)
on which a return should be earned and (4) what percentage figure
(rate of return)
should be applied to the rate base in order to establish the
return
(wages of capital) to which investors in the utility enterprise are reasonably entitled.[
]
1 A.
Priest, Principles of Public Utility Regulation
45 (1969) (emphasis in original).
The regulatory agency in this case acknowledged it did not determine “what percentage figure
(rate of return)
should be applied to the rate base in order to establish the
return.” Id.
The public utility asserts the neglect was fatal. It maintains our decisions in
Honolulu Gas Co. v. Public Utilities Commission,
33 Haw. 487 (1935), and
In re Hawaii Electric Light Co.,
60 Haw. 625, 594 P.2d 612 (1979), “ma[k]e it abundantly clear that a fair rate of return finding is essential to the, regulatory process,” directing us to statements therein that seemingly support the thesis. Still, the enforce
ment of text-book orthodoxy in the rate-making process is not our function under Hawaii Revised Statutes (HRS) Chapters 269 and 91; nor is it our practice to decide important questions of law by dicta from unrelated cases.
Cf. Permian Basin Area Rate Cases,
390 U.S. 747, 775 (1968) (the Supreme “Court does not decide important questions of law by cursory dicta inserted in unrelated cases.”),
reh’g denied,
392 U.S. 917 (1968).
Our function in rate making is a limited one. “[T]he general supervision . . . over all public utilities” has been delegated to the Public Utilities Commission. HRS § 269-6 (Supp. 1983). “It is the Commission that is authorized to fix ‘just and reasonable’ rates to be charged by public utilities, HRS § 269-16 (1976), and a reviewing court is not empowered to examine the case
de novo.” In re Hawaii Electric Light Co.,
60 Haw. at 629, 594 P.2d at 617 (citations omitted). Our role is circumscribed by the provisions of HRS § 91-14(g).
Section 91-14(g)(3), however, expressly provides that an administrative decision and order is subject to reversal or modification if “[m]ade upon unlawful procedure.” Since the claim of error here concerns the procedure employed in approving revised rate schedules for utility services, our task is to consider the challenged action in the light of pertinent procedural mandates.
The procedural requirements relating to rate determinations are delineated in HRS § 269-16(b). The subsection requires that
changes in rate schedules be preceded by notice and commission approval.
And a rate increase can only be approved after “a public hearing” at which consumers or patrons of the utility are allowed
to present their views regarding the increase and “a contested case hearing.”
See supra
note 11. Hawaiian Telephone does not dispute that the necessary “public hearing” and “contested case hearing” were conducted; nor does it contend the subsection expressly calls for a fair
rate
of return finding.
This aspect of the challenge of the rate order is purportedly grounded on the final portion of § 269-16(b), which “sums up the requirements of the entire ratemaking process” and dictates “just and reasonable” rates, “such as shall provide a fair return on the property . . . used or useful for public utility purposes.”
See supra
note 11. Citing general principles of rate making, the Company argues a fair return determination can only follow a finding on a fair
rate
of return. And since no such finding preceded the decision on what the amount of the return would be, it would have us declare the rate order failed to meet the statutory standard enunciated in § 269-16(b).
Whether the rates set by the Commission are “just and reasonable,” however, is by no means dependent on the procedure fob lowed by the rate-making body in deciding what return would be fair in the circumstances. “Under the statutory standard of ‘just and reasonable’ it is the result reached not the method employed which is controlling.”
Federal Power Commission v. Hope Natural Gas Co.,
320 U.S. 591, 602 (1944) (citations omitted);
In re Hawaii Electric Light Co.,
60 Haw. at 637, 594 P.2d at 621. As the Supreme Court explains:
It is not theory but the impact of the rate order which counts. If the total effect of the rate order cannot be said to be unjust and unreasonable, judicial inquiry ... is at an end. The fact that the method employed to reach that result may contain infirmities is not then important.
Federal Power Commission v. Hope Natural Gas Co.,
320 U.S. at 602. Discerning no statutory basis for faulting the method employed by the Commission in determining the return the utility was entitled to, we proceed to the question of whether the rate order, in total effect, can be said to be unjust and unreasonable.
III.
In Hawaiian Telephone’s opinion the Commission failed “to provide ... an opportunity [for the utility] to earn a fair return . . .
by arbitrarily limiting the rate award to a certain amount of net operating income” and also erred “in awarding a rate increase sufficient only to produce an annual revenue increase of $27,121,000 instead of the $47,600,000 requested.” Essentially, the claim is that the rate increases were not “such as shall provide a fair return.”
See supra
note 11.
The Commission acknowledgedly tailored rate increases to produce less revenue than sought and to yield “a certain amount of net operating income.” The resulting rate of return was 9.18% on the intrastate rate base rather than the 14.27% sought or the 11.3% and 12+% urged respectively by the Consumer Advocate and the Department of Defense, an intervenor in the proceeding.
“Rates which produce a return . .. more than 2% lower than the lowest rate of return [supported by an expert witness] in the case,” Hawaiian Telephone contends, “clearly are unjust, unreasonable and confiscatory.” Still, “the reasonableness of [utility] rates is not determined by a fixed formula but is a fact question requiring the exercise of sound discretion by the Commission.”
In re Hawaii Electric Light Co.,
60 Haw. at 636, 594 P.2d at 620 (citations omitted);
see also Federal Power Commission v. Natural Gas Pipeline Co.,
315 U.S. 575, 586 (1942).
Furthermore, “[i]t is . . . recognized that the ratemaking function involves the making of ‘pragmatic’ adjustments and .. . there is a ‘zone of reasonableness’ within which the [C]ommission may exercise its judgment.” 60 Haw. at 636, 594 P.2d at 620 (citations omitted). Viewing the decision and order in context with these precepts in mind, we cannot say the Commission
arbitrarily limited the rate award or clearly erred in any other respect.
The rate award was obviously shaped to take account of uncommon circumstances. Admittedly it was influenced by significant events that anteceded the application for approval of rate increases, including assertions that “$130 million in transition payments [would] lessen the need for local rate increases.” And revised rate schedules designed to provide the $41,700,000 in net operating income Hawaiian Telephone said would be required in test year 1982, rather than those submitted earlier by the utility, were approved. To be sure, the Commission deviated from normal practice in several respects as alleged. Yet as we observed earlier, “[a]gencies to whom [the rate-making] power has been delegated are free, within the ambit of their statutory authority, to make the pragmatic adjustments which may be called for by particular circumstances.”
Federal Power Commission v. Natural Gas Pipeline Co.,
315 U.S. at 586;
see also In re Hawaii Electric Light Co.,
60 Haw. at 636, 594 P.2d at 620.
The particular circumstances in the considered judgment of the rate-making agency called for practical adjustments to protect the public interest, and we perceive no grounds for a countermand of the ruling. Where approval by the FCC of a plan devised by AT&T and Hawaiian Telephone to postpone ordered rate reductions for interstate services and to provide $130,000,000 in “transitional supplements” for the latter over a four-year period was procured with the support of the State of Hawaii and such support was secured on a representation that telephone users in Hawaii would otherwise be subjected to “a local rate case generating $30-35 million per year,”
it would have been surprising if the Commission
had not looked askance at a plea for approval of intrastate rate schedules calculated to produce $47,600,000 in additional revenue.
We detect no basis for deeming the rate order confiscatory. Though witnesses testifying at the contested case hearing thought a fair rate of return would be several percentage points above the 9.18% return the approved rates were likely to provide, we think 9.18% was within the ‘zone of reasonableness.’
In re Hawaii Electric Light Co.,
60 Haw. at 636, 594 P.2d at 620 (citations omitted). “[Reasonableness ... is not determined by a fixed formula but is a fact question requiring the exercise of sound discretion . . . .”
Id.
When invoked as a guide, sound discretion is that “exercised not arbitrarily or wilfully, but with regard to what is right and equitable under the circumstances and the law.”
Langnes v. Green,
282 U.S. 531, 541 (1931) (quoted in
Cooke Trust Co. v. Edwards,
43 Haw. 226, 231 (1959)).
Here, the Commission allowed rate increases calculated to yield the net operating income Hawaiian Telephone decided it needed. The resulting rate of return for the utility was higher than the 8.6% it said would be yielded by the revised rate schedules submitted for approval. And we have recounted some of the other factors considered by the Commission in approving rate schedules structured to produce a net operating income of $41,700,000. Under the circumstances, we could not say the Commission was arbitrary; we would have to agree the rate order was fashioned with regard to what appeared right and equitable under the circumstances and the law. In the words of the Commission, “[t]o insure that rates are ‘just and reasonable’ includes the power to take into consideration the interest of the ratepayers as well as that of the utility owners.” P.U.C. Decision and Order No. 7412, at 27.
IV.
The foregoing conclusion that the rate order was just and reasonable in total effect would normally end our inquiry. Hawaiian Telephone, however, avers the decision under review is flawed in yet another respect; it alleges the Commission erred “by making an unsupported and unlawful ‘Separation Adjustment.’ ” We have examined the claim that the State agency invaded a federally preempted area by varying a jurisdictional separation approved by the FCC, but find the claim to be without merit.
Since the property of a telephone company is used in providing both intrastate and interstate telecommunications services and expenses are incurred in the joint rendition of such services, “a separation of telephone property, revenues, and expenses between the intrastate and interstate operations of the company ... ‘is essential to the appropriate recognition of the competent governmental authority in each field of regulation.’ ” NARUC-FCC Separations Manual,
supra,
at 5 (quoting
Smith v. Illinois Bell Telephone Co.,
282 U.S. 133, 148 (1930)). Hawaiian Telephone would have us rule the Commission intruded in an area reserved for federal regulation by adjusting the Company’s intrastate rate base for the test year to reflect the consequences of its agreement with AT&T which deferred rate reductions on interstate telecommunications services and stipulated that its share of the revenue generated by furnishing such services during the test year would consist of a cost-based portion and a “transitional supplement.”
The Commission, of course, may not interfere with federal regulation of interstate telecommunications services; the Supremacy Clause does not countenance rulings by a state rate-making agency that “may produce a result inconsistent with the objective of the federal [regulatory] statute.”
Maryland v. Louisiana,
451 U.S. 725, 747 (1981) (quoting
Rice v. Santa Fe Elevator Corp.,
331 U.S. 218, 230 (1947)). Thus for example, a state agency may not adopt for its rate-making purposes a depreciation formula incompatible with the depreciation method decreed for such purposes by the FCC through a preemption order.
See New England Telephone
&
Telegraph Co. v. Public Utilities Commission of Maine,
570 F. Supp. 1558 (D.Me. 1983).
Here, the Commission neither varied a formula, method, or procedure decreed by the federal agency nor tampered with interstate rates in any way. It expressly rejected the Consumer Advocate’s thesis that the circumstances surrounding the approval of “transitional supplements” by the FCC rendered it appropriate for those receipts to be considered as intrastate revenue, recognizing that “[t]he use of interstate revenues to satisfy intrastate revenue requirements would violate the fundamental principles of jurisdictional separations.” P.U.C. Order and Decision No. 7412, at 22.
These precepts also impelled the Commission to take account of the federal prologue to the local rate case in fixing the intrastate rate base, for inequity could have been the result if the FCC’s action and its effect on the apportionment of property, expenses, and revenue between jurisdictions were ignored. If each agency paid no heed to the action of the other in this area of mutual concern, a possible consequence could be that some costs of plant and expenses would not be included in the rate computations of either. In the situation above, the “carrier may be deprived of a fair rate of return when interstate and intrastate jurisdictions are both taken into account.”
New England Telephone & Telegraph Co. v. Public Utilities Commission,
448 A.2d 272, 298 (Me. 1982). Conversely, where property and expenses are allocated to both jurisdictions or misallocated, the resulting rates may be unjust and unreasonable for the telephone user.
Confronted by what appeared to be a misallocation of property and expenses, the Commission decided the circumstances called for an adjustment of the intrastate rate base. It initially observed the rate base claimed by the Company in this proceeding had been derived from an application of the separations method embodied in the NARUC-FCC Separations Manual (the Ozark Plan). P.U.C. Decision and Order No. 7412, at 23. But for the crucial agreement sanctioned by the FCC, the rate base would have been computed in accord with the separations method employed in the preceding rate case, Hawaiian Plan II.
Id.
Had this been done “the intrastate
earnings under present rates,” the Commission found, “would have been higher than that projected .. . [by applying] the Ozark formula.”
Id,.
From this it deduced that in “overall effect [there was a] shifting of the expenses and plant from the interstate to intrastate operations
but
with no change in the relative use [of the plant] and no change in [the Company’s] total operations.” P.U.C. Decision and Order No. 7412, at 24 (emphasis in original).
It reasoned that if the order for rate integration and cost-based settlements in the federally regulated sector had been fully implemented, the Company’s resort to the Ozark Plan in computing the rate base would have posed no problem.
Id.
But “[s]ince neither complete rate integration nor uniform cost based settlement will be achieved till January 1, 1985,” the Commission concluded “the immediate application of the Ozark separations formula for allocating expenses and plant in this proceeding will certainly be inequitable for intrastate ratepayers.”
Id.
Under these circumstances, we cannot say the Commission’s adjustment of the rate base constituted clear error or arbitrary action.
“ ‘Rate base’ represents the total investment in, or fair value of, the facilities of a utility employed in providing its service.” 1 A. Priest,
supra,
at 139. “While the difficulty in making an exact apportionment [between jurisdictions] of the property [used in providing service] is apparent.. . [and] only reasonable measures [are] essen
tial... it is quite another matter to ignore altogether the actual uses to which the property is put.”
Smith v. Illinois Bell Telephone Co.,
282 U.S. at 150-51 (citations omitted). Thus, a jurisdictional separation may be premised on either “actual use” or “relative use.” NARUC-FCC Separations Manual,
supra.
But in this case the acceptance of estimated rate bases for interstate and intrastate services derived from an application of the Ozark formula alone would have ignored altogether the use to which some property was ostensibly put to produce interstate revenue for Hawaiian Telephone, inasmuch as the revenue consisted of a portion fixed by the formula
plus
an additional sum of $32,650,000 for the test year.
We see no reason to disturb the pragmatic adjustment made by the Commission to reflect the relative use of Hawaiian Telephone’s facilities.
Marshall M. Goodsill (Thomas W. Williams, Jr.,
with him on (he briefs;
Goodsill, Anderson, Quinn
&f
Stifel,
of counsel) for Appellant Hawaiian Telephone Co.
Ronald Shigekane,
Deputy Attorney General, for Appellee Department of the Attorney General, Division of Consumer Advocacy, State of Hawaii.
The decision and order of the Public Utilities Commission is affirmed.