NERC interconnected operations services policy developments related to frequency control

Frequency response is necessary to stabilize interconnection and island frequency following the loss of load or generation. Frequency response is therefore important for interconnected power systems reliability. Interconnected operations services (IOS) describe those services necessary to maintain reliable power system interconnection operation. A proposed North American Electric Reliability Council (NERC) Policy 10, which is under development, defines IOS and associated responsibilities for suppliers, operating authorities, and customers. This document presents NERC policy developments related to IOS treatment of frequency response. The need for, and format of, a frequency response requirement is presently being debated. This document contains some suggestions on how the frequency response requirement could be defined