News

BOISE, ID – May 30, 2025 – Intermountain Gas Company filed a request with the Idaho Public Utilities Commission (Case No. INT-G-25-02), seeking a rate increase to serve its natural gas customers. If approved, the monthly bills for an average residential customer would increase by about $4.69, or 11.46%. Commercial customers bills would increase $9.26 monthly, or 5.16%.

The proposed increase is for approximately $26.5 million, or an 8.6% overall increase. This base price change is not impacted by changes in the cost of natural gas.

“The main drivers of this rate request are unprecedented growth in our service area and the rising cost of doing business,” said Nicole Kivisto, President and CEO of Intermountain Gas. “The rate increase requested in this filing is necessary to continue supporting Idaho’s economic development through investments in the infrastructure required to safely and reliably meet growth in customer demand, as well as addressing inflationary pressures.”

Operating and Maintenance costs have increased an average of 5.3% since the company’s last rate case. This increase is mainly due to higher labor and benefit costs. Other factors contributing to the requested increase include investments in the backbone infrastructure necessary to support gas delivery to a growing population and the resulting increase in depreciation expense.

“The rapid growth and system upgrades necessary for safety and reliability necessitate substantial capital investments. These investments are fundamental to enhancing Intermountain’s capacity to offer safe and reliable service to both existing customers and those seeking natural gas services,” Kivisto added.

The Idaho PUC has up to seven months to issue a decision on this request. If approved, new rates would go into effect on January 1, 2026. The request does not include the cost of natural gas, which is currently about 65% of a customer’s monthly bill.

Intermountain Gas encourages customers to use energy wisely. For more information about the company’s energy efficiency program and available rebates for installing high efficiency equipment, visit www.intgas.com/saveenergy. Conservation tips, information on energy assistance and information on the company’s level pay program can also be found on the company’s website: www.intgas.com.

This request is a proposal and is subject to review and approval by the PUC. A copy of the application is available for review at the commission, its homepage www.puc.idaho.gov, as well as the company’s website www.intgas.com. Written comments regarding the application may be filed with the commission by going to www.puc.idaho.gov/Form/CaseComment or mailing to:

Idaho Public Utilities Commission
P.O. Box 83720
Boise, ID 83720-0074

Customers may also subscribe to the commission’s RSS feed to receive periodic updates via email.

Intermountain Gas Company is a natural gas distribution company serving approximately 429,255 residential, commercial and industrial customers in 74 communities in southern Idaho. Intermountain is a subsidiary of MDU Resources Group, Inc., a member of the S&P SmallCap 600 index that provides essential products and services through its regulated electric and natural gas distribution and pipeline segments. For more information about MDU Resources, visit www.mdu.com. For more information about Intermountain, visit www.intgas.com.

Media Contact: Mark Snider at 208-377-6006 or [email protected]