Pennsylvania Builders Ass'n v. Pennsylvania Public Utility Commission

OPINION

McDERMOTT, Justice:

This case presents the consolidated appeals of the Pennsylvania Public Utility Commission (Commission), the Office of Consumer Advocate, and the Pennsylvania Power and Light Company (PP & L). 1 These parties appeal the order of the Commonwealth Court reversing a Commission order approving a tariff supplement filed by PP & L.

On April 6, 1978, PP & L filed a proposed tariff supplement which, among others, contained a provision (Rule 2-H) establishing mandatory building insulation standards for newly constructed buildings as a pre-condition to the provision of…