FERC approves PacifiCorp tariff revisions

PORTLAND, Ore. — The Federal Energy Regulatory Commission approved PacifiCorp’s proposed tariff order revisions for the Extended Day Ahead Market (EDAM), significantly advancing toward operations of the first multi-state regional day-ahead energy market, set to launch in May 2026. 

The tariff order approvals issued by FERC on August 29 authorized EDAM’s first two market participants, PacifiCorp and Portland General Electric, and approved the market’s congestion revenue model. 

“The tariff approval by FERC represents a significant step forward for our customers and EDAM participants,” said Cindy Crane, chief executive officer of PacifiCorp. “The development of a modern, coordinated day-ahead market in the West will help lower costs, enhance reliability and optimize the region’s energy resources.” 

PacifiCorp has been working with the California Independent System Operator and a wide range of stakeholders to develop the new day-ahead market. EDAM builds upon the existing Western Energy Imbalance Market, whose participants represent 80% of the West and which has delivered over $1 billion in savings to PacifiCorp customers as part of more than $7.4 billion in total benefits realized across the West since the market’s inception in 2014. 

“PacifiCorp looks forward to collaborating with EDAM participants in the West,” said Mike Wilding, vice present of energy supply management. “With resource diversity and transmission connectivity at the core, we’re now focused on expanding partnerships to create a truly integrated regional market to realize customer savings in a timely manner.”    

The WEIM optimizes the energy imbalances throughout the West by transferring energy between participants in 15-minute and 5-minute intervals throughout the day. EDAM builds on the real-time market by optimizing all loads and resources within the market, including resource commitments, a day in advance, unlocking far greater market efficiencies and value. 

PacifiCorp is expected to begin participating in EDAM in May 2026. 

For more information, visit the newly launched EDAM webpage on the WEIM website.