Rocky Mountain Power requests aim to keep prices affordable for Wyoming customers

CASPER, Wyo. — Rocky Mountain Power has filed two regulatory requests with the Wyoming Public Service Commission aimed at returning savings to customers while continuing to provide safe, reliable and low-cost electric service across Wyoming.

The first filing reflects lower fuel and purchased power costs and would result in an average 6% decrease in customer bills beginning July 1, 2026, pending PSC approval. The second is a general rate request that supports maintaining and upgrading the electrical system to deliver the level of service our customers count on.

Together, the two filings would result in an overall net customer bill increase of approximately 2.8% for Wyoming customers. For residential customers, the net increase would be 3.9% implemented over time and subject to careful and transparent review by state regulators.

“Providing reliable service and strong value is at the core of our commitment to customers,” said Dick Garlish, president of Rocky Mountain Power. “We pass savings back to customers when costs decline, manage expenses carefully, and focus every day on delivering dependable power at some of the lowest rates in the country.”

Rocky Mountain Power’s fuel and purchased power costs declined in 2025, reducing the cost of serving Wyoming customers. As part of the company’s required annual review, Rocky Mountain Power requested on April 15 an average 6% overall decrease in Wyoming customer bills.

For a typical residential customer using 700 kilowatt-hours per month, this would mean a 4.2% decrease, or about a $4.49 monthly bill reduction. The decrease would take effect July 1, 2026, subject to approval by the PSC.

On May 12, Rocky Mountain Power filed a request for a general rate review, seeking an average overall 8.8% increase, or $70.5 million, to recover prudent investments and updated cost forecasts. The request will be reviewed by the PSC and other parties during a 10-month public process.

The company proposes implementing the general rate increase in two phases:

• $68.3 million effective March 15, 2027
• $2.2 million estimated to be effective April 1, 2027, or when the transaction closes

The second phase reflects the return to customers of Wyoming’s share of the good will value associated with the sale of PacifiCorp’s Washington assets, reducing the April 2027 rate impact by $7.8 million. The sale, which is expected to be completed by then, was announced Feb. 17 to improve the company’s financial stability while simplifying company operations and supporting its long-term commitment to customers in each of the remaining states the company serves.

“Rising costs across the electric utility industry affect every energy provider,” Garlish said. “We work hard to manage the costs within our control, and our track record shows that Rocky Mountain Power remains among the lowest cost electric utilities in the nation.”

Rocky Mountain Power continues to pursue operational efficiencies and regional market innovations that reduce costs for customers. Participation in the Western Energy Imbalance Market has delivered more than $1.1 billion in benefits to PacifiCorp customers, primarily by lowering production costs and improving reliability through real-time energy sharing across the West.

The company began participating in the Extended Day-Ahead Market (EDAM) May 1, which will further improve how energy resources are scheduled and dispatched. EDAM supports Wyoming’s “all-of-the-above” energy strategy by optimizing the use of existing coal, natural gas and renewable resources—helping reduce wholesale power costs, maintain reliability and stabilize customer bills.

Both filings will be reviewed by the Wyoming Public Service Commission to ensure rates remain fair, reasonable and in the best interest of customers. More information is available at RockyMountainPower.net/WyomingRates.