The Electric Reliability Council of Texas Technical Advisory Committee on June 30 approved a rule change designed to provide more backup generation capacity when forced outages or weather diminishes market capacity by significant amounts, but one stakeholder said the changes could be “financially devastating.” In particular, ERCOT will increase its procurement of the ancillary service known as Responsive Reserve Service from 2.3 GW to 2.8 GW during peakload hours of 3 pm CT to 10 pm CT on all days. ERCOT will also increase its procurement of the ancillary service known as Non-Spinning Reserve Service such that total ancillary services (frequency regulation-up service, RRS and Non-Spin) total at least 6.5 GW of upward ramping capability (i.e., increased generation output) is available for all hours on all days. On days with a higher potential for weather forecast uncertainty, ERCOT can procure another 1 GW of non-spin.
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