Understanding NERC Impact Ratings and Compliance Timing for Generation Control Facilities

For power generation operators navigating NERC compliance, two questions come up again and again: when does a generation control facility become a Low Impact BES Control Center, and when does it cross into Medium Impact territory? Getting this classification right isn’t just a technical exercise — the compliance burden increases significantly with each impact level, making early planning essential. In this article, Joel Firestone, NERC Principal Consultant at Radian Generation, breaks down the five-step process for determining impact ratings, the critical 1,500 MW threshold, and how recent changes to compliance timing align registration with commercial operation dates.