N.Y. Comp. Codes R. & Regs. tit. 21 § 6.17
Upon petition, after the making of an order by the commission following a hearing, rehearing may be granted in the discretion of the commission. A petition for rehearing shall state in detail the grounds upon which it is based and shall separately set forth each error of law and fact alleged to have been made by the commission in its determination, together with facts and arguments in support thereof. Such petition shall be filed with the commission not later than 30 days after service of the order of the commission upon the parties, unless the commission for good cause shown shall otherwise direct. The commission may upon its own motion grant a rehearing after the making of an order following a hearing.
N.Y. Comp. Codes R. & Regs. Tit. 21 § 6.17