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Early May Heatwave Exposes Grid Vulnerabilities

Although the official start to summer is still weeks away, an early-May heatwave hit Heartland Power Cooperative’s service area. Dormant air conditioners weren’t the only things being put to the test as record heat melted the region.

The regional electric grid, managed by MISO (Midcontinent Independent System Operator), was strained with high electricity demand and limited generation resources. On May 12, MISO declared a Maximum Generation (Max Gen) Warning. MISO uses Max Gen procedures to help address grid constraints. In some circumstances, system conditions during a Max Gen scenario will call for electricity demand reduction measures, such as the use of our load management program. On May 12, we worked closely with our wholesale power provider, Dairyland Power Cooperative, to be prepared in case there was a need to reduce our cooperative’s electricity demand.

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