Calpine and AEP are offering alternatives to plans for complying with FERC Order 842, which requires some generators to provide primary frequency response.

Although FERC has required almost all new generating units to provide primary frequency response (PFR), PJM stakeholders are strongly opposing any move by the RTO to require existing units to follow suit.

PJM debated stakeholders over whether existing units should be under the same obligation to provide primary frequency response that FERC ordered for new units.

New generators seeking interconnections must be equipped to provide primary frequency response, FERC ruled.