California opens extended day-ahead market to coordinate western power
A new mechanism for energy procurement allows utilities across the Western United States to optimize electricity costs and regional grid stability.
Nao Fujita
Jul 3, 2026 · 1 min read
Power market participants in the Western United States began operating under a new regulatory and economic framework on May 1. The launch of the Extended Day-Ahead Market (EDAM) by California’s grid operator establishes a formal system for utilities to forecast and secure electricity supplies twenty-four hours in advance. The mechanism is designed to identify the most cost-effective generation sources across state lines, moving away from the fragmented procurement models of the past.
The shift to a day-ahead coordination model addresses the increasing complexity of a regional grid that must balance variable renewable inputs with shifting demand profiles. By pooling resources into a more transparent market, providers can mitigate the volatility of spot prices and increase the efficiency of existing transmission infrastructure. For industrial operators and large-scale utilities, the EDAM represents a necessary step toward a more integrated and resilient western energy architecture.