Existing rules, orders, and approvals of the public utilities commission which are associated with any functions, powers, and duties, transferred to the department of energy pursuant to N.H. Rev. Stat. § 12-P:11 or any other statutory provision, shall continue in effect notwithstanding any provision of N.H. Rev. Stat. § 541-A:17, II to the contrary, and be enforced by the commissioner of the department of energy or the commission, as applicable, until they otherwise expire or are repealed or amended in accordance with applicable law, or for a period of 5 years, whichever occurs first. To the extent the department acts pursuant to an existing rule, order, or approval, the department shall not be subject to N.H. Rev. Stat. § 541-A:29 or N.H. Rev. Stat. § 541-A:29-a.