66 Pa.C.S. § 2209
(c) Contents of standards.— Standards of conduct shall provide for:
(f) Conduct of investigations.—
(g) Referrals and investigation.— If, as a result of the investigation conducted under this section, the commission has reason to believe that anticompetitive or discriminatory conduct, including the unlawful exercise of market power, is preventing the retail gas customers from obtaining the benefits of a properly functioning and effectively competitive retail natural gas market, the commission, pursuant to its regulations, shall: