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After an earlier reform effort proved ineffective, the PJM Interconnection is taking a second swing at creating a pathway for bringing generation online by using surplus interconnection capacity at existing power facilities.
Surplus interconnection service, called SIS, allows a new generator or energy storage system to connect to the grid at a power facility’s existing interconnection point, using that asset’s excess capacity interconnection rights.
Surplus interconnection reviews can be significantly faster than standard interconnection studies, and using existing interconnection capacity can avoid costly network upgrades, according to Gavin Ahern, a co-founder of Surplus Interconnection, an advisory firm.
PJM reformed its Surplus Interconnection Service rules in early 2025, but little has come from that effort.
