California expands day-ahead energy trading across the Western United States
A new mechanism for coordinating power procurement aims to optimize regional supply and identify the most cost-effective electricity sources before the daily demand cycle begins.
Nao Fujita
Jul 3, 2026 · 1 min read
Every day, operators across the Western United States weigh the immediate requirements of the grid against the availability of remote generation. The launch of the Extended Day-Ahead Market, or EDAM, on May 1 signals a shift in how these participants commit to their power needs. By establishing a framework for coordinated procurement 24 hours in advance, California's grid operator is attempting to refine the efficiency of the regional energy trade.
The mechanism allows power providers to secure the least expensive available electricity before the physical constraints of the day-ahead schedule are locked in. For industrial operators and utilities, this transparency provides a buffer against the pricing volatility inherent in spot markets. The expansion reflects a structured effort to integrate disparate Western energy markets into a more cohesive, data-driven system that rewards low-cost generation and regional cooperation.