An Act amending Title 66 (Public Utilities) of the Pennsylvania Consolidated Statutes, in restructuring of electric utility industry, further providing for energy efficiency and conservation program.

HB 543 modifies Pennsylvania's electric utility regulations to strengthen energy efficiency program oversight. It requires the Public Utility Commission to review utility efficiency plans within 120 days, provide detailed reasons for disapproval, and allow utilities 60 days to revise plans addressing commission concerns. The bill specifically protects cost-effective mechanical insulation (used in heating/cooling systems) from disapproval solely based on its inclusion, requiring the commission to use a total resource cost test. This directly affects electric distribution companies and the commission, with the changes taking effect 60 days after enactment.