In Phila Gas Works v. Pa. Pub. Util. Comm’n, the Pennsylvania Supreme Court reviewed a ruling from the Commonwealth Court regarding late fees that Philadelphia’s public gas utility places on municipal liens that arise from delinquent customer accounts. The utility’s practice was to continue to accrue interest on the delinquent accounts even after filing a lien against the property with the prothonotary. But the Supreme Court ruled that Section 7106(b) of the Municipal Claims and Tax Lien Law prohibits the utility from imposing further fees once it elects to record the liens.