That's something that MISO sets. States are technically allowed to set their own requirement just based on the Federal Power act and how that jurisdiction was, was given. But MISO does a study every year to determine how much capacity is needed to meet the riskiest day. and how much excess you might need, given the chances that something could be worse than that. (18:29–18:47)
CLAIM
Asserts that MISO conducts an annual study to assess capacity needs for peak demand scenarios.
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