NV Energy signs agreement to join CAISO's Extended Day-Ahead Market (EDAM), targeting 2028 start

NV Energy, Nevada's largest utility, has formally signed an agreement with the California ISO to become the 9th Western entity to commit to joining the Extended Day-Ahead Market (EDAM), with participation planned to begin in 2028.

NV Energy's commitment expands the EDAM footprint into Nevada, building on its existing Western Energy Imbalance Market (WEIM) participation since 2015 (over $1.1B in realized savings). Broader EDAM participation is expected to improve day-ahead price formation, unlock cross-border transmission utilization, and increase regional reliability across the Western Interconnection as more balancing authorities join through 2026-2028.

This is a significant expansion event for the Western day-ahead market design, following EDAM's successful May 1, 2026 launch with CAISO and PacifiCorp. NV Energy's signing—backed by a Nevada PUC order citing connectivity benefits—demonstrates continued voluntary regional market integration in the West, a model contrasting with mandatory RTO expansion elsewhere in the US. The staggered onboarding schedule (PGE in Oct 2026; LADWP, BANC, PNM, Turlock ID in 2027; NV Energy, Imperial ID, BHE Montana in 2028) creates a multi-year phased implementation horizon that market participants must track for transmission scheduling, bidding rule changes, and settlement system readiness.

Western Energy Markets Governing Body governance framework for EDAM/WEIM market rules; Nevada Public Utilities Commission order authorizing NV Energy's EDAM participation

Portland General Electric begins EDAM participation · 1 Oct 2026

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