Eastern grid operator PJM Interconnection LLC reached a preliminary agreement Tuesday with Pennsylvania Gov. Josh Shapiro to resolve a pending lawsuit to cap prices paid to electricity generators for future supply.

Pennsylvania Governor Josh Shapiro on Tuesday said he has reached an agreement with grid operator PJM Interconnection to settle his recent complaint about its power market rules and save consumers over $21 billion in energy costs over two years.

If approved, the agreement would settle a complaint by Pennsylvania Gov. Shapiro over the PJM Interconnection’s capacity auction price cap.

Pennsylvania Gov. Josh Shapiro on Tuesday announced he’s reached agreement with the regional grid operator PJM Interconnection that he said will blunt the expected sharp rise in the cost of electricity later this year.

The organization that oversees the region’s electrical grid has agreed to a new cap on certain power price hikes, following a threat from Pennsylvania Gov. Josh Shapiro to consider pulling out of the system.