Glossary

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Last amended: 2026-10-25. See all amendments.

• Peak demand: the highest one-hour average power use in a period (MW).
• SPP: Southwest Power Pool, the regional grid operator including Kansas.
• EIA-930: the federal hourly grid-operations survey.
• Subregion WR / KCPL: EIA-930 areas within SPP roughly matching Evergy Kansas Central and Evergy Metro service areas.
• Net internal demand: forecast peak minus demand response that can be called on.
• Planning reserve margin (PRM): extra capacity required above the forecast peak (16% summer, 36% winter in SPP for 2026).
• Load factor: average demand divided by peak; lower means a peakier system.
• Demand response: paying or pricing customers to use less at peak times.