Despite the recent retirement of “blackstart” units, grid operators have sufficient resources to quickly restore systems in the event of widespread outages, suggests a new report by staff at the Federal Energy Regulatory Commission (FERC) and the North American Electric Reliability Corporation (NERC).

The report—“FERC-NERC-Regional Entity Joint Review of Restoration and Recovery Plans”—released May 2 presents findings from a joint FERC and NERC study that evaluated blackstart resources and planning by nine utilities registered with NERC. NERC—a non-profit international regulatory authority tasked with assuring reliability and security of the grid—defines a blackstart resource as one or more generating units and associated equipment that can be started without support from the bulk power system and is designed to remain energized without connection to the system. A blackstart unit energizes other equipment. The first generating unit in its cranking path is known as a “next-start” generating unit.

According to the report, blackstart generating units included in the participants’ system restoration strategies—and most participants had more than one, it noted—ranged from small (50 MVA) to larger units (100–200 MVA), to banks of generating units exceeding 1,000 MVA in capacity.…

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