An Act amending Title 66 (Public Utilities) of the Pennsylvania Consolidated Statutes, in general provisions, further providing for definitions; in powers and duties, providing for public interest; and, in rates and distribution systems, further providing for rates to be just and reasonable, for voluntary changes in rates and for rates fixed on complaint and investigation of costs of production.

Added a comprehensive definition of 'public interest' that requires the Commission to evaluate specific factors like affordability, renewable energy development, and environmental justice in all major utility decisions.

Mandated that the Commission include detailed public interest findings in all decisions relating to public utilities, including documentation of how conflicting factors were weighed.

Required the Commission to promulgate regulations within 18 months establishing a methodology for applying environmental justice factors and categorizing proceeding types.

Extended the deadline for the Commission to issue a final decision on rate reduction complaints from nine months to twelve months, with a possible 90-day extension for good cause.

Applied the new public interest standard to major infrastructure approval proceedings involving over $50 million in investment or affecting 10,000+ residential customers.