Billings Rimrock Substation Rebuild

The Rimrock Substation upgrade is a $34 million project to increase capacity to provide service for increased energy demand in the Billings area.

Reliable service for a growing community

Rendering of the Billings Rimrock Substation rebuild

Reliable service for a growing community

Growth is strong in Yellowstone County – the population grew more than 11% during the last decade – and NorthWestern Energy is investing almost $76 million in electric system upgrade projects to support population and industrial growth and increase energy service reliability for our customers.


Rendering of the Rimrock substation

The Rimrock Substation upgrade is a $34 million project to increase capacity to provide service for increased energy demand in the Billings area. Redundancy enhancement will provide improved reliability for customers.

NorthWestern Energy worked with the city of Billings to secure additional property for the upgrade. Construction on an additional substation at the site began in 2022.

The final phase of this complex project includes replacing wooden power line structures from the 1950s, upgrading transmission lines and replacing power poles.

Other electric infrastructure project work in the Billings area this summer includes transmission line and power pole upgrades along streets, alleys and Interstate 90. We appreciate the public’s cooperation and patience when traffic detours are needed for the safety of both the public and crews. Watch for “Utility Work Ahead” signs to alert that crews are working in the area.

Expect some traffic detours

Some traffic detours will be required for the safety of the public and crews working on the upgrade. 

 

For more information on this project, contact: