Who oversees the PA PUC?

Can you tell me who is responsible for overseeing the Pennsylvania Public Utility Commission, or PA PUC for short? Is it an independent regulatory body, or does it fall under the purview of a larger government agency? And what kind of authority does the PA PUC possess in regulating the utilities in the state? I'm particularly interested in understanding the structure and hierarchy of this organization, as well as its role in ensuring the fair and efficient provision of utility services to the people of Pennsylvania.