>Feb. 15 at approximately 12:10 pm. While still under EEA Level 3 and after exhausting reserves, SPP directed member utilities to implement controlled, temporary interruptions of service.
>Feb. 16 at 6:15 a.m. SPP declared an EEA Level 3. System-wide generating capacity had dropped below current load of approximately 42 gigawatts (GW) due to extremely low temperatures, inadequate supplies of natural gas and wind generation. SPP directed member utilities to implement controlled, temporary interruptions of service.
Not exactly true. SPP the grid operator for OK and the area immediately east of Texas did have to go to EEA3 twice and implement rolling blackouts
https://spp.org/markets-operations/current-grid-conditions/
>Feb. 15 at approximately 12:10 pm. While still under EEA Level 3 and after exhausting reserves, SPP directed member utilities to implement controlled, temporary interruptions of service.
>Feb. 16 at 6:15 a.m. SPP declared an EEA Level 3. System-wide generating capacity had dropped below current load of approximately 42 gigawatts (GW) due to extremely low temperatures, inadequate supplies of natural gas and wind generation. SPP directed member utilities to implement controlled, temporary interruptions of service.