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Company describes market‑purchase limits, EDAM/WRAP impacts and a proxy cost escalation correction in avoided‑cost filing
Summary
Rocky Mountain Power told the commission it is reducing reliance on market capacity purchases in the IRP due to WRAP/EDAM expectations and identified a post‑filing correction to proxy escalators that modestly lowers wind costs and raises solar proxy costs in later years.
Rocky Mountain Power said the 2025 IRP reflects a downward trend in using market purchases for capacity and that expected changes under the Western Resource Adequacy program (WRAP) and entry to an enhanced day‑ahead market (EDAM) will require more physical resources rather than relying on short‑term market capacity.
Dan McPhail told the technical conference that market capacity purchases — often called front‑office…
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