Sweeney, J.
Ohio Utilities raises 14 propositions of law in this appeal, some of which involve discretionary decisions by the .Public Utilities Commissiou. For the sake of brevity, we .will limit our discussion to the five riiost significant issues. ... . '
[156]*156L
■ Appellant first challenges the authority of the commission to proceed with the instant investigation as it did. In initiating this investigation, appellee based its authority on R. C. 4905.26, which states, in pertinent part:
“Upon complaint in writing against any public utility by any person, firm, or corporation, or upon the initiative or complaint of the public utilities commission, that any rate, # * * rendered, charged, demanded, * * * or exacted, is in any respect unjust, unreasonable, unjustly discriminatory, unjustly preferential, or in violation of law, * * * if it appears that reasonable grounds for complaint are stated, the commission shall fix a time for hearing, * * #.” (Emphasis added.)
Ohio Utilities alleges that the commission improperly used that provision to alter its January 18, 1977, rate order for appellant. It is appellant’s view that the only statutory provision which would authorize the commission its alter a prior rate order is R. C. 4909.15(E).1 Since that section requires that there be an application by a person or public utility before the commission can alter or amend an order fixing a rate, Ohio Utilities contends that appel-lee is without authority to investigate, on its own initiative, existing rates, if it thereafter orders new rates. However, in addition to misconstruing the instant investigation as an attempt by appellee to alter its prior rate order, appellant interprets R. C. 4905.26 too narrowly. In discussing that provision this court has previously stated that, “[t]his language is extremely broad, and would permit what might be strictly viewed as a ‘collateral attack’ in many instances.” Western Reserve Transit v. Pub. Util. Comm. (1974), 39 Ohio St. 2d 16, 18. While R. C. 4905.26 was invoked in that case by a complaint filed by a utility, rather than upon [157]*157the initiative of the commission, onr interpretation of the statute is still persuasive.
Appellant’s limiting construction of E. C. 4905.26 strips it of its usefulness. If, after an investigation and hearing pursuant to this statute, the commission determines that existing rates are unjust or unreasonable, it must follow that the commission can then remedy the situation by ordering that new rates be put in effect. In Ohio Bell Telephone Co. v. Pub. Util. Comm. (1969), 17 Ohio St. 2d 45, we suggested the use of an E. C. 4905.26 hearing as a method whereby the commission could review the reasonableness of a rate schedule it was required to initially accept. In responding to the contention that, by being forced to accept schedules filed by the utility, a method would exist for the utility to exact exorbitant rates from its customers, ve stated, at page 48, that, “[t]he consumer is protected from an unjust or unreasonable rate for such new service by Section 4905.26, Eevised Code, which provides that such proposed rate may be reviewed by the commission upon a complaint by any person, or upon the initiative or complaint of the commission itself.” Implicit in that statement is the conclusion that the commission eould adjust any rates it found to be unjust or unreasonable.2 Specifically, the commission could, as it did below, invoke its authority under E. C. 4909.15(1)) (2) (b) to “fix and determine the just and reasonable rate * * * to be * * * charged, * * * and order such just and reasonable rate * * * to be substituted for the existing one.”
Tins joining of statutory authority to support the corn-[158]*158■mssion’s investigation of existing rates and. subsequent substitution of new rates was approved of by the United States Supreme Court in Public Utilities Comm. of Ohio v. United Fuel Gas Co. (1943), 317 U. S. 456, 464. There, the ■court was concerned with an attempt by the commission to fix rates retroactively. To support its holding that the commission’s authority was prospective only, the court combined G-. C. 614-21 and 614-23 (predecessors of R. C. 4905.-26 and 4909.15, respectively).3 We concur in this combined reading of R. C. 4905.26 and 4909.15(1)), as being appropriate in situations such as the instant cause, and as effectuating the public interest.
n.
Ohio Utilities contends further that Section 4 of Am. :Sub. S. B. No. 94 prohibits appellee from applying the ■original cost provisions of Ohio’s new rate law to the investigation of appellant’s existing rates. Section 4 provides, in relevant part:
“ * * # this act does not apply to an application for .an increase in any rate filed under section 4909.18, * * * •of the Revised Code prior to January 1, 1976, and1 all proceedings and orders in connection therewith shall be governed by the law in effect at the time of the filing of the .application.”
Appellant’s previously existing rates were established ■under the former rate law, subsequent to appellant’s application for a rate increase filed under R. C. 4909.18. The [159]*159former law determined rate base on the basis of reproduction cost new less depreciation. The instant investigation, begun on September 7, 1977, determined appellant’s rate base on the basis of the original cost method prescribed by the new rate law. Since the effect of this proceeding was to reduce the rates established under the old law, Ohio Utilities views this E. C. 4905.26 investigation as a continuation of the prior proceeding, so that the application of original cost is prohibited by Section 4.
Contrary to appellant’s contention, the instant proceeding was not a rehearing or continuation of appellant’s prior application for a rate increase. It was, rather, a separate investigation of the reasonableness of Ohio Utilities’ rates, begun after the new rate law became effective. Appellant’s line of reasoning would insulate all rates set under prior law from review by the commission, no matter how unjust or unreasonable they may have become. We cannot believe that the General Assembly intended such a result when it enacted Section 4.
In so stating, we do not mean to imply that appellee is free to require all utilities to defend their rate schedules in an E. C. 4905.26 investigation and hearing, simply because their rates were fixed under the old law. E. C. 4905.26 requires that “reasonable grounds for complaint” be stated before the commission can conduct a hearing and order a utility to produce information. This prerequisite should apply whether the commission begins such a proceeding on its own initiative, or on the complaint of another party. Here the investigation was based upon what appellee’s staff described as “the apparently unique circumstance of the Ohio Utilities Co., e. g., a high original cost to reproduction cost factor and substantial amounts of contributed property.” We agree with appellee that this unique status of Ohio Utilities provided “reasonable grounds” for the commission to proceed to hearing.
III.
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Sweeney, J.
Ohio Utilities raises 14 propositions of law in this appeal, some of which involve discretionary decisions by the .Public Utilities Commissiou. For the sake of brevity, we .will limit our discussion to the five riiost significant issues. ... . '
[156]*156L
■ Appellant first challenges the authority of the commission to proceed with the instant investigation as it did. In initiating this investigation, appellee based its authority on R. C. 4905.26, which states, in pertinent part:
“Upon complaint in writing against any public utility by any person, firm, or corporation, or upon the initiative or complaint of the public utilities commission, that any rate, # * * rendered, charged, demanded, * * * or exacted, is in any respect unjust, unreasonable, unjustly discriminatory, unjustly preferential, or in violation of law, * * * if it appears that reasonable grounds for complaint are stated, the commission shall fix a time for hearing, * * #.” (Emphasis added.)
Ohio Utilities alleges that the commission improperly used that provision to alter its January 18, 1977, rate order for appellant. It is appellant’s view that the only statutory provision which would authorize the commission its alter a prior rate order is R. C. 4909.15(E).1 Since that section requires that there be an application by a person or public utility before the commission can alter or amend an order fixing a rate, Ohio Utilities contends that appel-lee is without authority to investigate, on its own initiative, existing rates, if it thereafter orders new rates. However, in addition to misconstruing the instant investigation as an attempt by appellee to alter its prior rate order, appellant interprets R. C. 4905.26 too narrowly. In discussing that provision this court has previously stated that, “[t]his language is extremely broad, and would permit what might be strictly viewed as a ‘collateral attack’ in many instances.” Western Reserve Transit v. Pub. Util. Comm. (1974), 39 Ohio St. 2d 16, 18. While R. C. 4905.26 was invoked in that case by a complaint filed by a utility, rather than upon [157]*157the initiative of the commission, onr interpretation of the statute is still persuasive.
Appellant’s limiting construction of E. C. 4905.26 strips it of its usefulness. If, after an investigation and hearing pursuant to this statute, the commission determines that existing rates are unjust or unreasonable, it must follow that the commission can then remedy the situation by ordering that new rates be put in effect. In Ohio Bell Telephone Co. v. Pub. Util. Comm. (1969), 17 Ohio St. 2d 45, we suggested the use of an E. C. 4905.26 hearing as a method whereby the commission could review the reasonableness of a rate schedule it was required to initially accept. In responding to the contention that, by being forced to accept schedules filed by the utility, a method would exist for the utility to exact exorbitant rates from its customers, ve stated, at page 48, that, “[t]he consumer is protected from an unjust or unreasonable rate for such new service by Section 4905.26, Eevised Code, which provides that such proposed rate may be reviewed by the commission upon a complaint by any person, or upon the initiative or complaint of the commission itself.” Implicit in that statement is the conclusion that the commission eould adjust any rates it found to be unjust or unreasonable.2 Specifically, the commission could, as it did below, invoke its authority under E. C. 4909.15(1)) (2) (b) to “fix and determine the just and reasonable rate * * * to be * * * charged, * * * and order such just and reasonable rate * * * to be substituted for the existing one.”
Tins joining of statutory authority to support the corn-[158]*158■mssion’s investigation of existing rates and. subsequent substitution of new rates was approved of by the United States Supreme Court in Public Utilities Comm. of Ohio v. United Fuel Gas Co. (1943), 317 U. S. 456, 464. There, the ■court was concerned with an attempt by the commission to fix rates retroactively. To support its holding that the commission’s authority was prospective only, the court combined G-. C. 614-21 and 614-23 (predecessors of R. C. 4905.-26 and 4909.15, respectively).3 We concur in this combined reading of R. C. 4905.26 and 4909.15(1)), as being appropriate in situations such as the instant cause, and as effectuating the public interest.
n.
Ohio Utilities contends further that Section 4 of Am. :Sub. S. B. No. 94 prohibits appellee from applying the ■original cost provisions of Ohio’s new rate law to the investigation of appellant’s existing rates. Section 4 provides, in relevant part:
“ * * # this act does not apply to an application for .an increase in any rate filed under section 4909.18, * * * •of the Revised Code prior to January 1, 1976, and1 all proceedings and orders in connection therewith shall be governed by the law in effect at the time of the filing of the .application.”
Appellant’s previously existing rates were established ■under the former rate law, subsequent to appellant’s application for a rate increase filed under R. C. 4909.18. The [159]*159former law determined rate base on the basis of reproduction cost new less depreciation. The instant investigation, begun on September 7, 1977, determined appellant’s rate base on the basis of the original cost method prescribed by the new rate law. Since the effect of this proceeding was to reduce the rates established under the old law, Ohio Utilities views this E. C. 4905.26 investigation as a continuation of the prior proceeding, so that the application of original cost is prohibited by Section 4.
Contrary to appellant’s contention, the instant proceeding was not a rehearing or continuation of appellant’s prior application for a rate increase. It was, rather, a separate investigation of the reasonableness of Ohio Utilities’ rates, begun after the new rate law became effective. Appellant’s line of reasoning would insulate all rates set under prior law from review by the commission, no matter how unjust or unreasonable they may have become. We cannot believe that the General Assembly intended such a result when it enacted Section 4.
In so stating, we do not mean to imply that appellee is free to require all utilities to defend their rate schedules in an E. C. 4905.26 investigation and hearing, simply because their rates were fixed under the old law. E. C. 4905.26 requires that “reasonable grounds for complaint” be stated before the commission can conduct a hearing and order a utility to produce information. This prerequisite should apply whether the commission begins such a proceeding on its own initiative, or on the complaint of another party. Here the investigation was based upon what appellee’s staff described as “the apparently unique circumstance of the Ohio Utilities Co., e. g., a high original cost to reproduction cost factor and substantial amounts of contributed property.” We agree with appellee that this unique status of Ohio Utilities provided “reasonable grounds” for the commission to proceed to hearing.
III.
Appellant’s third major challenge to the proceedings below focuses on appellee’s exclusion of contributed property or “contributions in aid of construction” from the [160]*160rate base. Specifically, the commission excluded the amount contained in Account No. 271 (Contributions in Aid of Construction), $4,391,120 of which consisted of cash and property supplied by the Davis-owned development companies. Appellee justified these exclusions as being required by R. C. 4909.05(1) and (J).4
Appellant contends that by excluding such contributions from the rate base, after they had been included under the former law, R. C. 4909.05 effectively confiscates such property in violation of the Due Process Clause of the Fourteenth Amendment. This assertion is without merit. In 1942, the United States Supreme Court declared that, “ [t]he Constitution does not bind rate-making bodies to the service of any single formula or combination of formulas.” Federal Power Comm. v. Natural Gas Pipeline Co. (1942), 315 U. S. 575, 586. In a concurring opinion, Justice Black went on to state, at page 603, that, “rate-making is one species of price-fixing. Price-fixing, like other forms of social legislation, may well diminish the value of the property which is regulated. But that is no obstacle to its validity.” Thus, appellant’s analogy to eminent domain principles is completely misplaced.
The exclusion from rate base of contributions in aid of utility construction is so uniformly accepted in other jurisdictions as “probably not to require detailed citation.”5 Two interrelated reasons support such an exclusion. Jus[161]*161tice Brandéis enunciated the first reason in his dissent from the opinion in Missouri, ex rel. S. W. Bell Tel. Co., v. Public Service Comm. (1923), 262 U. S. 276, 290, as follows: “The thing devoted by the investor to the public use is ** * capital embarked in the enterprise. Upon the capital so invested the Federal Constitution guarantees to the utility the opportunity to earn a fair return.” (Emphasis added.) It is thus the investment of the shareholder which comprises the rate base, not contributions of others. This is especially true in “original cost” jurisdictions, since a contribution would normally have a zero original cost.
The corollary to this first rationale for excluding customer contributions is contained in Cincinnati v. Pub. Util. Comm. (1954), 161 Ohio St. 395. There, in discussing customer contributions in the form of deposits and advances on installation charges, at page 405, Ave stated: “ ‘Where the rate payers provide such funds, it is not proper that •the stockholders should be alloAved a return on them by including them in the rate base.’ ” (Quoting from Chicopee Mfg. Co. v. Pub. Serv. Co. [N. H. 1953], 93 A. 2d 820, 826.) Such contributions are not devoted to public use by the ■utility’s investors, but by the customers for their own, not the investors’, benefit.
Ohio Utilities argues that since these funds were received from the development companies which had the same oAvnership as did the utility, the property should be considered investment by shareholders. This argument, however, negates the basic distinction between corporate and shareholder identity.
The language of ft. C. 4909.05 (I) is not limited to direct customer contributions, and most other courts have upheld exclusions of similar development company contributions For instance, Avhen confronted Avith the same contention in Hagerstown v. Public Service Comm. (1958), 217 Md. 101, 108, 141 A. 2d 699, the court there found “no difference, * * * whether these payments were made in the first instance by the developers or by the purchasers of lots.” Though there was no direct evidence to show that [162]*162the funds originally came from customers, the court took judicial notice that “any such costs originally paid by the-developers [to secure water service from the utility] were-passed on to the purchasers in the form of increased prices, for lots.” Similarly, in Princess Anne Utilities Corp. v. Commonwealth (1971), 211 Va. 620, 624, 179 S. E. 2d 714, the court discussed the “common practice in real estate development to finance construction of sewerage facilities, by the contribution method employed in this case, with the cost of such construction reflected in the prices paid by the-purchasers of homos in the finished development.” Finally, in Florida Cities Water Co. v. Board of Cty. Com’rs (Fla. App. 1976), 334 So. 2d 622, 625, a Florida appeals court found that, “since the developer and the utility had a common ownership and the utilty serviced the lots being developed by the developer, a reasonable inference may be drawn that the source of these monies came from the sale of the lots.” The same inference arises in the instant cause, and it is supported by the method by which the funds were accounted for and by testimony that the market price of the improved lots did reflect the value of water and sewer services. Thus, appellee correctly excluded the amounts, contained in Account No. 271 from the rate base.
TV.
Ohio Utilities argues next that it was denied due process of law by the commission’s alleged waiver of its Rule 4901-1-18, Ohio Adm. Code, which, in a case such as the one-herein, requires the issuance of an attorney examiner’s report before the commission proceeds to opinion and order. Here, appellee dispensed with- this report because of its desire to conduct this investigation in an expeditious fashion. Since this matter was initiated pursuant to R. C.. 4905.26 and heard before attorney examiners, it seems that an attorney examiner’s report was required,6 and it was-, thus error for appellee to waive it. However, Ohio Utilities [163]*163has- not shown' that it was prejudiced by this error. It is well-settled that “ [t]his court will not reverse an order of the commission as unreasonable or unlawful because of an error of the commission, if such error did not prejudice the party seeking such reversal." Cincinnati v. Pub. Util. Comm. (1949), 151. Ohio St. 353, paragraph six of the syllabus. In its application for rehearing, appellant raised numerous allegations of error, thus giving the commission ample opportunity to remedy any irregularities in its May 18, 1978, opinion and order. It is difficult for this court ‘to imagine what additional objections appellant may have wished to level against the contents of an examiner’s report. ■
V.
The contention that the commission violated appellant’s due process rights by use of an historical test period and date certain, rather than the tost period recommended by R. C. 4909.15 (C) is refuted by our opinion in Franklin Co. Welfare Rights Org. v. Pub. Util. Comm. (1978), 55 Ohio St. 2d 1, wherein, at page 6, we enunciated the basic reason for the use of test year results: “ * * * The lest year operations of a utility are utilized to determine whether that utility should be authorized to earn additional •operating income from proposed future rates. The test year results must therefore be reasonably representative •of normal operations.” (Emphasis added.) In that case, the new rates became effective seven months after the •close of the test period, whereas here the lag was eight months. In neither Franklin Co. Welfare Rights Org., nor in the instant cause, did the utility show that the actual results of the historical test period are less representative than the partially projected data of the test period recommended by R. C. 4909.15(C).
The remainder of appellant’s propositions of law relate to matters which are within the discretion of the commission. Specifically, appellant questions the commission’s selection of the proper rate base and depreciation accrual rates; the allocation of federal income tax expense [164]*164to appellant on the basis of an average rate taken from the consolidated tax return of appellant’s parent company; the extent to which the commission included rate case expenses in appellant’s operating expenses; and the reasonableness of the rate of return selected by the commission. As we have stated on several occasions, “[a] commission finding will not be disturbed unless manifestly against the weight of the evidence and so clearly unsupported by the record as to show misapprehension, mistake, or willful disregard of duty.” Akron v. Pub. Util. Comm. (1978), 55 Ohio St. 2d 155, 156. See, also, Cincinnati v. Pub. Util. Comm. (1978), 55 Ohio St. 2d 168, and Cleveland Elec. Illuminating Co. v. Pub. Util. Comm. (1975), 42 Ohio St. 2d 403. We find that in none of these instances did ap-pellee abuse its discretion.
The commission’s order, being neither unreasonable nor unlawful, is hereby affirmed.
Order affirmed.
Celebrezze, C. J., HeebeRt, W. Brown and Locher, JJ., concur.
P. Brown, J., concurs in paragraphs one and three of the syllabus and in the judgment.