Activists in Utah and Wyoming held rallies this week urging state regulators to scrutinize a document they believe will raise energy bills for hundreds of thousands of Westerners, and worsen air pollution across the northern Rockies.

The subject of the gatherings was Rocky Mountain Power’s 2025 integrated resource plan, a roadmap for electricity generation and transmission from the largest utility in both states, and a subsidiary of PacifiCorp, which is owned by billionaire Warren Buffett’s Berkshire Hathaway. This year’s integrated resource plan , which is updated every two years, forecasted slowing investments in wind and solar power and battery storage—increasingly inexpensive ways of delivering electricity without producing greenhouse gas emissions.

Residents and environmentalists in

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