For a writ of prohibition to issue, the respondent must be about to exercise judicial or quasi-judicial power, the exercise of that power must be unauthorized by law, and refusal of the writ must result in injury for which no other adequate legal remedy exists. State, ex rel. Albright, v. Delaware Cty. Court of Common Pleas (1991), 60 Ohio St.3d 40, 572 N.E.2d 1387; State, ex rel. Lewis, v. Warren Cty. Court of Common Pleas (1990), 52 Ohio St.3d 249, 556 N.E.2d 1184.
The first and third prongs of this test have been established. By issuing the temporary restraining order, respondent Sheward clearly exercised jurisdiction, and it is clear that if not restrained he” will exercise further judicial power. State, ex rel. Northern Ohio Tel. Co., v. Winter (1970), 23 Ohio St.2d *806, 52 O.O.2d 29, 260 N.E.2d 827; State, ex rel. Dayton, v. Kerns (1977), 49 Ohio St.2d 295, 3 O.O.3d 441, 361 N.E.2d 247. Moreover, if not allowed to implement “interim” rates under R.C. 4909.42, CSP will suffer a current revenue loss that cannot be recovered. Therefore, it has no adequate legal remedy. Accordingly, the controversy in this case concerns the test’s second prong and whether respondent Sheward’s exercise of jurisdiction is unlawful.
Relator CSP contends that the General Assembly, through R.C. Title 49, has vested exclusive jurisdiction over ratemaking matters with the commission. It argues that R.C. 4909.42 is an integral part of the statutory ratemaking scheme and that respondent Sheward’s exercise of jurisdiction below usurps the exclusive ratemaking authority of the commission. Respondents, in their motions to dismiss, argue that the issue below involves only a determination of the constitutional validity of R.C. 4909.42, and that respondent Sheward’s exercise of jurisdiction to determine that issue does not interfere with the commission’s ratemaking authority. For the reasons that follow, we agree with respondents, grant their motions to dismiss, and deny the writ sought by relator CSP.
That this matter does not interfere with the commission’s ratemaking authority is evident by the relief which the intervening respondents seek below. They are not requesting respondent Sheward to establish just and reasonable rates for CSP, or to review an order of the commission which purports to do so.3 Rather, they are seeking a declaratory judgment that R.C. 4909.42 is unconstitutional. Such a finding would impair no order or other authority of the commission. Accordingly, we distinguish this case from Albright, supra, in which we prohibited a declaratory judgment and injunction action by a board of county commissioners that would have bypassed statuto*81rily prescribed annexation proceedings and thus impaired the exclusive authority of another board of county commissioners to conduct those proceedings.
It is settled that an administrative agency is without jurisdiction to determine the constitutional validity of a statute. S.S. Kresge Co. v. Bowers (1960), 170 Ohio St. 405, 11 O.O.2d 157, 166 N.E.2d 139, paragraph one of the syllabus. Although intervening respondents’ constitutional claim could be raised before the commission and subsequently appealed to this court under the statutory scheme provided in R.C. Title 49, see Panhandle Eastern Pipe Line Co. v. Pub. Util. Comm. (1978), 56 Ohio St.2d 334, 10 O.O.3d 452, 383 N.E.2d 1163, such alternative remedy does not render the common pleas court’s jurisdiction over this matter unlawful. American Life & Acc. Ins. Co. of Kentucky v. Jones (1949), 152 Ohio St. 287, 40 O.O. 326, 89 N.E.2d 301; Herrick v. Kosydar (1975), 44 Ohio St.2d 128, 73 O.O.2d 442, 339 N.E.2d 626.
In American Life & Acc. Ins. Co., supra, this court stated that “ * * * an action for a declaratory judgment may be alternative to other remedies in those cases in which the court, in the exercise of sound discretion, finds that the action is within the spirit of the Uniform Declaratory Judgments Act, that a real controversy between adverse parties exists which is justiciable in character, and that speedy relief is necessary to the preservation of rights which may be otherwise impaired or lost. * * * ” (Citations omitted.) Id., 152 Ohio St. at 295-296, 40 O.O. at 330, 89 N.E.2d at 306.
In Herrick, an action was brought in common pleas court seeking a declaratory judgment that certain amended tax statutes were unconstitutional on their face. The trial court granted a motion to dismiss upon the basis that the claim was exclusively within the jurisdiction of the Tax Commissioner by way of administrative hearing and appeal to the court. The court of appeals reversed and, on appeal, this court found that, although an alternative administrative remedy existed, the common pleas court had jurisdiction over the declaratory judgment action. The court based its reasoning upon American Life & Acc. Ins. Co., supra, and also upon the administrative agency’s inability to determine the constitutional validity of a statute, citing S.S. Kresge, supra. With regard to the constitutional issue, the court found the declaratory judgment action to be the superior remedy, noting that the alternative administrative proceedings would be but “futile preludes” to the subsequent assertion of the constitutional claim before the courts. Herrick, supra, 44 Ohio St.2d at 130, 73 O.O.2d at 443, 339 N.E.2d at 628.
We find Herrick to be controlling in this instance. This proceeding clearly falls within the purview of R.C. Chapter 2721, it presents a real controversy which is justiciable in character, and speedy relief is necessary to preserve intervening respondents’ rights affected by the allegedly unconstitutional *82provisions of R.C. 4909.42. Moreover, given the commission’s lack of jurisdiction to determine the specific constitutional issue presented, the declaratory judgment action is superior to the alternative administrative proceeding. Thus, upon authority of Herrick, we find that respondent Sheward’s exercise of jurisdiction over this matter is not unlawful.
Accordingly, we grant respondents’ motions to dismiss and deny the writ. Further, because our order of January 15, 1992 preserved the temporary restraining order past the time limit for an extension by the trial court, the trial court shall be given two days from the date of this decision to extend its order. Until such time, the order shall be regarded as remaining in effect.
Writ denied.
Moyer, C.J., Holmes, Douglas and H. Brown, JJ., concur. Sweeney, Wright and Resnick, JJ., dissent.. The commission has not issued such an order because it does not have authority to determine the level of the “interim” rates permitted under R.C. 4909.42. Thus, the extent of the commission’s jurisdiction under the statutory scheme is not as comprehensive as relators suggest.
Relators assert that an entry issued by the commission in the pending rate case (PUCO No. 91-418-EL-AIR [December 10, 1991]) constitutes an “order,” and precludes respondent She-ward from exercising jurisdiction over this matter, pursuant to R.C. 4903.12, which provides: “No court other than the supreme court shall have power to review, suspend, or delay any order made by the public utilities commission, or enjoin, restrain, or interfere with the commission or any public utilities commissioner in the performance of official duties. * * * ” The relevant portion of the commission’s entry merely indicates the commission’s intent to require CSP to make customer-specific refunds if the interim rates placed in effect pursuant to R.C. 4909.42 are found to be excessive upon the issuance of the commission’s final order in the permanent rate proceeding. As such, we cannot construe the entry to be an order of the commission.