
625 N.W.2d 786 (2001)
244 Mich. App. 401
ATTORNEY GENERAL Jennifer M. Granholm, Appellant,
v.
MICHIGAN PUBLIC SERVICE COMMISSION and Detroit Edison Company, Appellees.
Docket No. 215919.
Court of Appeals of Michigan.
Submitted June 6, 2000, at Lansing.
Conflict of interest found December 8, 2000, at 9:10 a.m.
Resubmitted January 4, 2001, at Lansing.
Decided January 26, 2001, at 9:00 a.m.
Released for Publication March 22, 2001.
*787 Jennifer M. Granholm, Attorney General, Thomas L. Casey, Solicitor General, and Donald E. Erickson, Assistant Attorney General, for the Attorney General.
Allan S. Falk, Special Assistant Attorney General, for the Public Service Commission.
Before METER, P.J., and GRIFFIN and TALBOT, JJ.
Resubmitted after stipulation of counsel, January 4, 2001, at Lansing.
PER CURIAM.
Appellant Attorney General appeals as of right an order of the Public Service Commission (PSC) granting appellee Detroit Edison Company's motion to terminate the proceedings in Case Nos. 00-011449 and 00-011528 regarding Edison's request for a suspension of its power supply cost recovery (PSCR) clause. We affirm.
Pursuant to this Court's opinion of December 8, 2000, Attorney General v. Public Service Comm., 243 Mich.App. 487, 625 N.W.2d 16 (2000), appellee PSC and appellant Attorney General have filed a stipulation regarding counsel for the PSC. In view of the resolution of the conflict of interest issue, we now address the merits of this appeal.

I

Factual Background of PSC Proceeding
In connection with the deregulation of the electric utility industry, Edison sought approval in Case No. 00-011449 to suspend its PSCR clause from January 1, 1998, through December 31, 2001. The PSC established a contested case proceeding in which it heard testimony and received exhibits in July and September 1997. On September 30, 1997, as it was statutorily required to do, Edison filed a PSCR plan for calendar year 1998 that was assigned Case No. 00-011528. However, Edison reaffirmed its desire that the PSC suspend its PSCR clause and requested that the commission dismiss Case No. 00-011528 if in fact the PSCR clause was suspended in Case No. 00-011449.
On October 29, 1997, in Case No. 00-011449, the PSC authorized Edison to suspend the operation of its PSCR clause through December 31, 2001, but ruled that the suspension could only go into effect when five percent of Edison's customers were being served by independent third-party power suppliers. This condition was later amended in orders issued in January and February 1998 to provide that the PSCR suspension would be implemented when the amount of power being conveyed by independent third-party suppliers reached 225 megawatts in a given month. These orders and others were appealed to this Court. See Midland Cogeneration Venture v. Public Service Comm., unpublished opinion per curiam of the Court of Appeals, issued June 9, 2000 (Docket Nos. 209549, 209550, 209560, 209578, and 209579).
However, the condition that would trigger the suspension of Edison's PSCR clause never occurred; in the interim, the PSC conducted evidentiary hearings in Case No. 00-011528 regarding Edison's proposed PSCR factor for calendar year 1998, in which the Attorney General and other parties presented testimony and exhibits regarding calculation of the PSCR *788 factor. Following these proceedings, the hearing referee issued a proposal for decision regarding Edison's 1998 PSCR factor, to which the Attorney General and others filed exceptions.
At approximately the same time, Edison moved to withdraw the applications and terminate the proceedings in Case Nos. 00-011449 and 00-011528 regarding the suspension of its PSCR clause. The pleading noted that more than a year had passed since Edison filed its proposal and supporting testimony in Case No. 00-011449 and that "[t]he time for implementing Edison's proposal had passed, while the circumstances that once supported that proposal have changed." Edison averred that "opposition to the suspension of Edison's PSCR clause continues, while the entire impetus for that suspension has largely vanished or abated." The Attorney General argued that under MCR 7.208(A) the PSC lacked jurisdiction to vacate any order while an appeal to this Court was pending and that even if the PSC had such jurisdiction it could not vacate any order without first conducting a public hearing.
On October 26, 1998, the same date as the order appealed from in this case, the PSC issued an order in Case No. 00-011528 authorizing Edison to implement its proposed PSCR factor for 1998. The commission also issued the order that is the subject of this appeal in which it terminated the proceedings in Case No. 00-011528 to the extent those proceedings involved the suspension of Edison's PSCR clause. The PSC addressed the Attorney General's argument as follows:
The Commission finds that the Attorney General's citation to ... MCR 7.208(A) are not well taken. The Attorney General's arguments are based on his concern that granting Detroit Edison's motion requires rehearing or amendment of the final orders of the Commission that have been appealed to the Court of Appeals. However, the Commission finds that the orders previously issued in ... [Case No.] U-11449 indicate that the Commission would use Case No. U-11528 as the vehicle to resolve the remaining issues that had to be addressed to complete implementation of Detroit Edison's proposal to suspend its PSCR clause. Therefore, the Commission finds that termination of further consideration of those issues in Case No. U-11528 does not necessitate either a rehearing or a revision of any of its previous orders. In any event, the Commission retained jurisdiction to issue further orders in ... [Case No.] U-11449.
In conclusion, the order stated only that "Edison's request to terminate further proceedings regarding suspension of its PSCR clause should be granted."

II

Appellant's Issues on Appeal
As we stated in Attorney General v. Public Service Comm., 231 Mich.App. 76, 77-78, 585 N.W.2d 310 (1998), this Court's review of an order of the PSC is limited:
Pursuant to M.C.L. § 462.25; MSA 22.44, all rates, fares, charges, classification and joint rates, regulations, practices, and services prescribed by the PSC are presumed, prima facie, to be lawful and reasonable. Michigan Consolidated Gas Co. v. Public Service Comm., 389 Mich. 624, 209 N.W.2d 210 (1973). An aggrieved party bears the burden of proving by clear and convincing evidence that the order appealed is unlawful or unreasonable. MCL 462.26(8); MSA 22.45(8). An order is unlawful if it is based on an erroneous interpretation or application of the law, *789 and it is unreasonable if it is not supported by the evidence. Associated Truck Lines, Inc. v. Public Service Comm., 377 Mich. 259, 140 N.W.2d 515 (1966). A reviewing court must give due deference to the administrative expertise of the PSC and may not substitute its judgment for that of the agency. City of Marshall v. Consumers Power Co. (On Remand), 206 Mich.App. 666, 677, 523 N.W.2d 483 (1994). However, this does not mean that courts may abandon or delegate their responsibility to interpret statutory language and legislative intent. Miller Bros. v. Public Service Comm., 180 Mich.App. 227, 232, 446 N.W.2d 640 (1989).
This Court has held that the commission possesses the authority to suspend a PSCR clause. However, in this case, when the conditions precedent to the suspension of Edison's PSCR clause failed to materialize, the commission conducted public hearings and entered an order approving rates utilizing Edison's proposed 1998 PSCR factor. Thus, Edison's requests in Case Nos. 00-011449 and 00-11528 for suspension of its PSCR clause became moot for two reasons: first, because the conditions precedent to the suspension never occurred, and second, because the requests were rendered a nullity by the passage of time, where the window of implementation had passed and a rate for 1998 was set using the PSCR factor. Put simply, the PSC could not vacate what was already a nullity.
Appellant contends the commission's action is barred by MCR 7.208(A), which prohibits a trial court or tribunal from setting aside or amending the judgment or order appealed from "except by order of the Court of Appeals, by stipulation, or as otherwise provided by law." However, contrary to appellant's assertion, no prior orders were amended or set aside.[1] MCR 7.208(A) does not apply to an order that is simply a formal statement that certain administrative proceedings have been concluded. Not only is there no statute or other authority barring administrative agencies from issuing such orders, but such a rule would potentially wreak havoc on agencies' dockets for no good reason, especially where, as in this case, the issues involved in the proceeding have become moot. Although appellant maintains vigorously that Edison should not be allowed to endlessly litigate a case, if appellant's appeal in this case were successful, the result would be to prevent entry of an order granting Edison's request to terminate litigation. The logical inconsistency in such an argument is readily apparent.
Appellant also contends that the PSC was required to conduct an evidentiary hearing before it could issue the order terminating proceedings. Because the PSC directly addressed and rejected appellant's arguments regarding termination of the proceedings in the order on appeal, appellant cannot claim she was denied notice or the opportunity to be heard. There is no dispute that the issues surrounding Edison's 1998 PSCR clause, and the suspension of that clause, were fully litigated before the agency throughout 1997 and 1998. Moreover, it would be a waste of administrative resources to conduct the evidentiary hearing appellant seeks regarding Edison's base rate for 1998. Such a *790 hearing would have been necessary had the PSCR clause been suspended; however, there is no dispute the PSCR clause remained in force and was utilized in the calculation of Edison's rates for 1998.
We find appellant's legal arguments regarding collateral estoppel and res judicata to be irrelevant. Even if such principles applied in the context of administrative proceedings, there is nothing in the record that would support the conclusion that the order appealed from constitutes a subsequent proceeding in which issues were relitigated. Consequently, we find this issue completely lacking in merit.[2]
In view of our disposition, we find it unnecessary to address appellees' supplemental argument that appellant's appeal is moot by operation of 2000 PA 141.
Affirmed.
NOTES
[1]  Thus, this case does not present an appropriate vehicle to address the unresolved issue whether M.C.L. § 460.351; MSA 22.111, under which the commission has "full power and authority to ... alter, amend or modify its findings and orders," brings the PSC within the exception in MCR 7.208(A) referring to authority to set aside or amend orders "as otherwise provided by law."
[2]  We question whether appellant's appeal is vexatious. See MCR 7.216(C)(1)(a). However, because this potential issue has not been raised, briefed, or argued by counsel, we choose not to address it.
