The purpose of BAL-001(-1) (Real Power Balancing Control Performance) is to maintain Interconnection steady-state frequency within defined limits by balancing real power demand and supply in real time. The purpose of BAL-002(-1) (Disturbance Control Performance) is to ensure the Balancing Authority is able to utilize its Contingency Reserve to balance resources and demand and return Interconnection frequency within defined limits following a Reportable Disturbance. Because generator failures are far more common than significant losses of load and because Contingency Reserve activation does not typically apply to the loss of load, the application of DCS is limited to the loss of supply and does not apply to the loss of load.
Load-Generation Control Performance Standards (NERC BAL-001 and BAL-002)
"Interconnections Abnormal Frequency Events Selection Methodology for Supporting Definition of NERC Control Standards." CERTS Research Supporting Reliability Performance Standards 2011. .
"NERC Control and Reserves Planning Standards Integrated Overview." NERC Balancing Control and Reserves Planning Standards 2011. .