Marcellus Shale Coal. v. Dep't of Envtl. Prot. of Pa.

SAYLOR, C.J., BAER, TODD, DONOHUE, DOUGHERTY, WECHT, MUNDY, JJ.

OPINION

CHIEF JUSTICE SAYLOR

This is a direct appeal in the context of pre-enforcement judicial review of regulations governing the operation of unconventional gas wells in Pennsylvania. The Commonwealth Court, sitting as a trial court, issued a single-judge opinion and order preliminarily enjoining the enforcement of some of the challenged regulations. The administrative-agency parties appeal from that decision.

I. Background

On October 13, 2016, Appellee, the Marcellus Shale Coalition ("MSC"), filed in the Commonwealth Court's…