MISO system conditions are returning to a normal state as extreme temperatures that gripped parts of the midcontinent region moderate.
MISO continued a second day Thursday operating under emergency procedures as the extreme cold drove high electric demand across the RTO’s 15-state footprint.
The MISO North and Central regions came out of a Maximum Generation Event at 9:30 a.m. ET and remained in a Maximum Generation Warning until 11 a.m. ET, when it expired. The entire footprint is expected to exit conservative operations status as of 6 p.m. ET Thursday. Maximum Generation emergency procedures allow MISO greater flexibility and resources – such as emergency power purchases – to ensure system reliability.
While demand was high, the system did not set a peak record. Wednesday’s peak market system load (preliminary) was 100.9 GW – compared to an average peak load Jan. 1-Jan. 28 of 86.7 GW. MISO’s all-time winter peak was 109.3 GW on Jan. 6, 2014. Thursday’s (preliminary) peak was around 100.1 GW.
MISO worked closely with members and neighboring grid operators to manage reliability across the grid during this event. MISO operators and its members train regularly on emergency operations. MISO is appreciative of all of the employees of its member utilities who also worked safely to maintain local reliability.
As a standard process, MISO will evaluate the event in the coming days to ensure the RTO captures and incorporates lessons learned as part of its commitment to continuous improvement.