The Bonneville Power Administration’s draft decision “solidifying” its day-ahead market choice in favor of SPP’s Markets+ has reignited a yearslong debate over the agency’s direction.

The Western Energy Imbalance Market’s Intermountain West region saw its hourly exports increase by an average of 780% — or 680 MW — in Q4 2025 versus the same period a year earlier.

A draft order from the Public Utilities Commission of Nevada signals that the commission is likely to approve NV Energy’s participation in CAISO’s Extended Day-Ahead Market.

The size and configuration of day-ahead markets in the West will greatly impact electricity bills and grid reliability, says the Environmental Defense Fund.

CAISO is moving toward approval of an $8.5 million financing plan for the Regional Organization for Western Energy’s start-up costs.

CAISO is proposing new methods to address “poor quality data” from some variable energy resources in the region in order to improve grid forecasting, the ISO said in a straw proposal.

CAISO’s Western Energy Imbalance Market saw an increase in battery storage capacity and coal use in 2025 compared with 2024, although the total load across the market did not increase over the year.

It’s an “all-hands-on-deck” moment for CAISO to open its extended day-ahead market in less than two months, CAISO’s CEO Elliot Mainzer said at a Western Energy Market Board of Governors meeting.

Black Hills Energy and PowerWatch are to join CAISO’s Western Energy Imbalance Market, extending the market’s geographical reach into South Dakota, the ISO announced.

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.