the commission shall allow the public utility to recover all prudent and reasonable costs associated with the development, management, financing and operation of the program, provided that such prudent and reasonable costs shall be recovered only in accordance with appropriate accounting principles. Nothing in this section shall permit the recovery of costs in a manner prohibited by section 1315 (relating to limitation on consideration of certain costs for electric utilities). Nothing in this section shall permit the recovery of the cost of producing, generating, transmitting, distributing or furnishing electricity or natural gas.
66 Pa.C.S. § 1319