
619 N.W.2d 163 (2000)
242 Mich. App. 363
In re PAROLE OF BIVINGS.
People of the State of Michigan, Plaintiff-Appellee and
Wayne County Prosecutor Intervening Plaintiff-Appellee,
v.
Keith D. Bivings, Defendant-Appellee and
Michigan Department of Corrections and Parole Board, Intervening Defendants-Appellants.
Docket No. 209083.
Court of Appeals of Michigan.
Submitted March 15, 2000, at Detroit.
Decided August 29, 2000, at 9:00 a.m.
Released for Publication October 31, 2000.
*164 John D. O'Hair, Prosecuting Attorney, Timothy A. Baughman, Chief of Research, Training, and Appeals, and George E. Ward, Chief Assistant Prosecuting Attorney, for Wayne County Prosecutor.
Jennifer M. Granholm, Attorney General, Thomas L. Casey, Solicitor General, and Chester S. Sugierski, Jr., Assistant Attorney General, for Department of Corrections and Parole Board.
Before: RICHARD ALLEN GRIFFIN, P.J., and HOLBROOK, JR., and J.B. SULLIVAN[*], JJ.
PER CURIAM.
Intervening defendants Michigan Department of Corrections (MDOC) and Parole Board appeal by leave granted from the Wayne Circuit Court's opinion and order declaring MDOC Policy Directive 06.05.104 unconstitutional, setting aside defendant Keith D. Bivings' twelve-month parole violation "sentence" and remanding to the Parole Board with instructions to exercise independent discretion in determining the portion of Bivings' sentence he must serve as the minimum for his parole violation. We reverse.
On November 11, 1994, Bivings was convicted by guilty plea of two counts of delivery of less than fifty grams of heroin, M.C.L. § 333.7401(2)(a)(iv); MSA 14.15(7401)(2)(a)(iv). On November 22, 1994, he was sentenced to two concurrent prison terms of two to twenty years. At the time of sentencing, the twenty-year-old Bivings had an extensive juvenile record of property-related offenses and a 1993 conviction of attempted possession of cocaine. Bivings served twenty months of his sentence, was paroled on August 1, 1996, but was again arrested on March 17, 1997, for possession of heroin and cocaine. Since Bivings was already under a maximum twenty-year sentence, the Wayne County Prosecutor's office deferred prosecution on *165 the new narcotics offense and referred the case to the MDOC for two parole violation counts. The prosecutor appeared at Bivings' parole violation hearing and recommended that Bivings serve at least three more years of his maximum twenty-year sentence before being considered again for parole. However, pursuant to a plea bargain, Bivings pleaded no contest to one count of violating his parole in exchange for a recommendation by the MDOC's Office of Field Programs (OFP) that he be given a twelve-month (as opposed to the prosecutor's requested three-year) continuance before being considered for parole. Bivings' parole was revoked, and the Parole Board voted to accept the OFP recommendation that he be considered for parole in twelve months.
The prosecutor appealed to the circuit court, arguing that the Parole Board's decision effectively set a new minimum sentence of only twelve months before Bivings could again be considered for parole and that policy directive 06.05.104 was unconstitutional because it impermissibly restricted the Parole Board's discretion to impose an appropriate, and in this case harsher, penalty for a parole violator who, like Bivings, is also a third-time repeat offender. The prosecutor asked the circuit court to either determine that three years without parole was the appropriate minimum penalty for Bivings' parole violation or remand the case to the Parole Board with instructions that it use its discretion and ignore policy directive 06.05.104. Bivings' counsel argued that the prosecutor was asking the court to substitute its judgment for that of the Parole Board; that Bivings pleaded no contest to violating his parole pursuant to a plea bargain and recommendation; that the Parole Board's one-year continuance was not the equivalent of a one-year minimum sentence because there was no guarantee of parole after one year; and that the circuit court lacked jurisdiction to consider the matter because the Parole Board had not reached a final decision on whether to grant Bivings parole. The circuit court agreed with the prosecutor, determined that an administrative order from the MDOC director could not restrict the Parole Board's discretion, declared policy directive 06.05.104 unconstitutional, and remanded Bivings' case to the Parole Board with instructions to exercise independent discretion in determining the portion of the earlier sentence Bivings must serve as a minimum for the parole violation without regard to that directive but with regard to the state's public policy of progressively more severe penalties for repeat offenders.
The Parole Board and the MDOC intervened and moved for reconsideration, arguing that it was inappropriate for the court to order the Parole Board to resentence Bivings because the board has no sentencing authority, that the court had no power to change defendant's sentence, that the policy directive does not mandate parole after the specified periods but instead only sets the schedule for reconsideration of parole, and that the prosecutor was impermissibly attempting to take away the Parole Board's discretion to even consider a defendant for parole. The circuit court denied intervening defendants' motion for reconsideration.
The challenged portion of MDOC policy directive 06.05.104 states:
Prisoners denied parole will be considered [for parole] at 12, 18, or 24 months, as determined by the Board or a Panel of the Board. Exceptions to the reconsideration time frames shall be explained in the Parole Board Notice of Action.
On appeal to this Court, intervening defendants again argue that the trial court lacks power or authority to change an otherwise valid sentence, that the Parole Board's power is limited to requiring a defendant to serve portions of the maximum sentence imposed by the trial court, that a continuance is not a "sentence" because there is no guarantee of release after the specified period of continuance, and that policy directive 06.05.104 merely *166 sets periods after which a prisoner's eligibility for parole will be reconsidered. The issue presents a question of law that we review de novo on appeal. People v. Thomas, 438 Mich. 448, 452, 475 N.W.2d 288 (1991).
MCL 791.206; MSA 28.2276 provides the MDOC with the authority to promulgate rules controlling the manner in which paroles are considered. In re Parole of Roberts, 232 Mich.App. 253, 257, 591 N.W.2d 259 (1998). See also Blank v. Dep't of Corrections, 462 Mich. 103, 611 N.W.2d 530 (2000) (opinion by Kelly, J.). A continuance is the period before an inmate will next be considered for parole. Roberts, supra at 256, 591 N.W.2d 259. The Parole Board, which is part of the MDOC, has the discretion to order a continuance of more than twelve months. Id.; In re Wayne Co. Prosecutor, 232 Mich.App. 482, 484, 591 N.W.2d 359 (1998). The period can range from one day to the maximum sentence imposed for the original offense. Id. at 486, 591 N.W.2d 359.
Under M.C.L. § 791.234(7); MSA 28.2304(7),[1] in effect at the time relevant to the case before us, the Parole Board's decision to grant or deny parole was appealable to the circuit court by the prisoner, the prosecutor, or the victim. Wayne Co. Prosecutor, supra at 485, 591 N.W.2d 359; MCR 7.104(D). However, the statutory framework regarding proceedings for parole revocation, as opposed to parole grant or denial, provided for no such participation by the prosecutor or the victim. Wayne Co. Prosecutor, supra at 486, 591 N.W.2d 359. Parole revocation proceedings are contested cases under the Administrative Procedures Act (APA), M.C.L. § 24.201 et seq.; MSA 3.560(101) et seq., and the only parties with a "protected interest" who are entitled to a parole revocation hearing are the parolee and the department. Wayne Co. Prosecutor, supra at 488, 591 N.W.2d 359. While M.C.L. § 49.153; MSA 5.751 provides that the prosecutor "shall" appear in court in all proceedings "in which the state or county may be a party or interested," parole revocation proceedings are not prosecutions, and the MDOC is not a court or part of the judiciary. Wayne Co. Prosecutor, supra at 489, 591 N.W.2d 359.
In Wayne Co. Prosecutor, supra, the prosecutor brought a complaint for superintending control against the MDOC and the Parole Board, seeking to intervene as a party in a parole revocation proceeding that followed a parolee's alleged commission of a crime. The prosecutor argued that, where there are several years remaining in the reoffending parolee's maximum sentence for the paroled offense, it would be more expedient for the Parole Board to order a lengthy period before the offender would again be considered for parole than to prosecute the parolee for the new offense. The trial court dismissed the prosecutor's complaint, and this Court affirmed. This Court explained that neither the statutes governing parole revocation proceedings nor the APA create a duty by the Parole Board to permit intervention by the prosecutor and concluded that the circuit court was correct in determining that the prosecutor's arguments involve lawmaking and must therefore be *167 directed to the Legislature. Id. at 490, 591 N.W.2d 359. This Court noted that the board had discretion to permit prosecutorial intervention at the revocation proceeding and reiterated the prosecutor's right to appeal the ultimate grant of parole pursuant to M.C.L. § 791.234(7); MSA 28.2304(7). However, this Court concluded that, until the Legislature acted, those were the only measures available to the prosecutor to accomplish his objectives.
In the case before us, the prosecutor again attempts to accomplish the same objectives, albeit this time by appearing at the revocation proceeding and, when his request for a three-year "sentence" was denied, by naming Bivings as the defendant and appealing the action of the Parole Board to the circuit court. As noted, the appeal asked the circuit court to either resentence Bivings to an additional three years or to declare policy directive 06.05.104 an unconstitutional restriction on the Parole Board's discretion to resentence Bivings to a higher minimum before he is again considered for parole. It is well settled that, absent an error that renders a sentence invalid, a circuit court lacks authority to modify the sentence a defendant has begun to serve. People v. Wybrecht, 222 Mich.App. 160, 166, 564 N.W.2d 903 (1997); see MCR 6.429(A). "[S]uch an action may infringe upon the Governor's commutation powers and intrude upon the parole board's jurisdiction." Wybrecht, supra at 167, 564 N.W.2d 903. Bivings had served approximately two years of his sentence for his 1994 conviction, was on parole and therefore still in the "legal custody and control" of the MDOC. M.C.L. § 791.238(1); MSA 28.2308(1). The circuit court was without authority to revisit that sentence.
Moreover, even though the prosecutor appeared at Bivings' parole revocation proceeding and requested that the Parole Board not reconsider Bivings for parole for a minimum of three years, pursuant to Wayne Co. Prosecutor, supra, the prosecutor lacked standing to appeal the Parole Board's decision to reconsider Bivings' parole eligibility twelve months following the revocation of his parole. MCL 791.234(7); MSA 28.2304(7)[2] did not extend the prosecutor's right to appeal the ultimate grant or denial of parole to revocation proceedings and to the Parole Board's decision to reconsider the prisoner's eligibility for parole again in twelve months. Because the Parole Board has no clear legal duty to permit the prosecutor to intervene in parole revocation hearings, Wayne Co. Prosecutor, supra at 486, 591 N.W.2d 359, and because the prosecutor is not a "party" for purposes of the APA, id. at 487-489, 591 N.W.2d 359, it follows that the prosecutor has no standing to appeal the Parole Board's decision under the APA. The prosecutor's sole remedy is to appeal the board's decision to grant parole under M.C.L. § 791.234(7); MSA 28.2304(7).[3] Therefore, the trial court erred in considering the prosecutor's appeal.
The trial court also erred in declaring policy directive 06.05.104 an unconstitutional restriction on the Parole Board's discretion. Michigan's Separation of Powers Clause, Const. 1963, art. 3, § 2 provides:
The powers of government are divided into three branches; legislative, executive; and judicial. No person exercising powers of one branch shall exercise powers properly belonging to another branch except as expressly provided in this constitution.
The constitutional doctrine of separation of powers has been interpreted as prohibiting one branch of government from exercising the "whole" power properly delegated to another branch. People v. Raihala, 199 Mich.App. 577, 580, 502 N.W.2d 755 (1993).
The MDOC was created by chapter 12 of the Executive Organization *168 Act, M.C.L. § 16.375; MSA 3.29(275), and represents an administrative agency within the executive branch of Michigan's government. Const. 1963, art. 5, § 2; Hopkins v. Parole Bd., 237 Mich.App. 629, 636, 604 N.W.2d 686 (1999). The MDOC has exclusive jurisdiction over questions of parole. MCL 791.204; MSA 28.2274; Hopkins, supra at 637, 604 N.W.2d 686. The Parole Board was established as an entity within the MDOC. M.C.L. § 791.231a; MSA 28.2301(1); Hopkins, supra at 637, 604 N.W.2d 686. "The release of a prisoner on parole shall be granted solely on the initiative of the parole board," M.C.L. § 791.235(1); MSA 28.2305(1), and specific determinations whether to release prisoners on parole rest with the Parole Board's discretion. MCL 791.234(8); MSA 28.2304(8).[4]Hopkins, supra at 637, 604 N.W.2d 686. As an entity within the MDOC, the Parole Board is part of the executive branch of government. It is entirely within the power of the MDOC, which has exclusive jurisdiction over matters of parole, to implement policy directives setting specific intervals for reconsideration of parole decisions by the Parole Board. MCL 791.206; MSA 28.2276. Because both are part of the executive branch of government, a separation of powers argument is inapplicable. Directive 06.05.104 merely provides for intervals at which parole is to be reconsidered. It does not mandate release of a prisoner and therefore has no effect on the Parole Board's discretion.
Reversed.
NOTES
[*]  Former Court of Appeals judge, sitting on the Court of Appeals by assignment.
[1]  MCL 791.234; MSA 28.2304 was amended by 1998 PA 314 and 1999 PA 191. The 1998 amendment redesignated subsection 7 as 8; the 1999 amendment redesignated 8 as 9, and made deletions so that the subsection now states:

Except as provided in section [MCL 791.2]34a[MSA 28.2304(1)], a prisoner's release on parole is discretionary with the parole board. The action of granting a parole is appealable by the prosecutor of the county from which the prisoner was committed or the victim of the crime for which the prisoner was convicted. The appeal shall be to the circuit court in the county from which the prisoner was committed, by leave of the court.
While the 1999 amendment is a substantial departure from its predecessors, which permitted appeals from both grants and denials of parole by the prisoner as well as the prosecutor and the victim, that change is not relevant to the specific issue in this case.
[2]  See n. 1, supra.
[3]  See n. 1, supra.
[4]  See n. 1, supra.
