All final decisions and orders of the commission concluding a contested case shall be in writing or orally stated and shall be made a part of the record of such case. The commission shall serve a copy of its final decision on each party and intervenor in the manner required by sections 1-21j-1 to 1-21j-57, inclusive, of the regulations of Connecticut state agencies and by chapter 54 of the general statutes.
Conn. Agencies Regs. § 1-21j-42