CAISO’s load-balancing EDAM math doesn’t add up, says CPUC staff

This is a story about how California's power grid operator manages electricity markets across state lines, and it doesn't touch homeowners directly. Still, it's worth a plain explanation.

California's grid operator, CAISO, launched a new regional electricity market in May that lets utilities in different Western states buy and sell power a day ahead of when it's needed. The idea is that sharing power across a bigger area saves money and keeps the lights on more reliably. But regulators at the California Public Utilities Commission say some of CAISO's numbers don't add up. They questioned why CAISO made large last-minute adjustments to how much backup power it required on two specific days, and asked CAISO to explain the math. A group of six California cities that buy power made a similar complaint, saying the market's cost to participants has been high while the benefits so far look small. A wholesale power trading company also asked for clearer accounting of who is actually paying certain grid congestion fees.

None of this changes anything about your electric bill right now. It's a dispute among regulators, utilities, and grid officials over transparency in a wholesale power market that operates behind the scenes. If the market ends up working as intended, it could help keep regional electricity costs and reliability in check over time, but that outcome is still being sorted out. For now, there's no rebate, program, or rule change here that affects what you'd do at home.