For the first time in years, California’s grip on Western market design is genuinely at risk, writes Nick Myers of the Arizona Corporation Commission.

Arizona Public Service would save $110 million/year by joining CAISO's Extended Day-Ahead Market rather than SPP's Markets+, a new analysis found.

The consequences of the Bonneville Power Administration’s decision to join SPP’s Markets+ could hit the Northwest sooner rather than later even though the agency has yet to formally join the market, a group of nonprofits suing it over the choice told the 9th U.S. Circuit Court of Appeals.

CAISO released a set of guiding principles for upcoming discussions about seams between the ISO, SPP and other entities as the Extended Day-Ahead Market nears its opening in May.

Stakeholders endorsed PJM’s recommended installed reserve margin and forecast pool requirement for the 2028/29 Base Residual Auction at the Markets and Reliability Committee meeting.

FERC has rescinded the West-wide wholesale electricity price cap mechanism it implemented in response to widespread price manipulation during the Western energy crisis of 2000/01, saying development of new markets and expanded authority has led to improved monitoring capabilities.

FERC upheld its approval of Constellation Energy’s purchase of Calpine while also addressing arguments from consumer and environmental groups.

MISO said lackluster generating unit performance led to an emergency declaration during the late January winter storm.

CAISO’s Western Energy Imbalance Market surpassed $8 billion in cumulative economic benefits since its 2014 launch after providing participants with $415.65 million in gross benefits in the fourth quarter of 2025, according to an ISO report.