PSE IN MONTANA:
THE COLSTRIP TRANSMISSION SYSTEM

The Colstrip Transmission System was built in the early 1980s to move power from the Colstrip generating facilities to transmission systems in western Montana. The Colstrip Transmission System is jointly owned by NorthWestern Energy, Avista Corporation, Portland General Electric, Puget Sound Energy and PacifiCorp. 

 

The Colstrip system is made up of two 500 kilovolt segments. The first runs from Colstrip to Broadview. The second runs from Broadview to Townsend. At present, Colstrip power moves across the Bonneville Power Administration’s (BPA) transmission system west of Townsend before reaching local utility customers and BPA’s main grid.

 

PLANNING FOR THE FUTURE

 

As a Washington-state based utility, PSE must plan to meet the requirements of the Clean Energy Transformation Act, which require electric utilities to transition to a carbon-neutral supply of electricity. In order to comply with state law, PSE must remove coal from its portfolio by the end of 2025.

 

As a Washington-state based utility, PSE must plan to meet the requirements of the Clean Energy Transformation Act, which require electric utilities to transition to a carbon-neutral supply of electricity. In order to comply with state law, PSE must remove coal from its portfolio by the end of 2025.

 

There is significant interest in developing renewable resources in Montana and already there have been several agreements for new renewables to interconnect to the Colstrip Transmission System with more expected to come. PSE is committed to investing in Montana renewables and has already taken some initial steps in investing in new wind in Montana through the development of the Beaver Creek Wind Farm as well as power purchase agreements. 

 

Access to any available transmission capacity can only be obtained by following the Federal Energy Regulatory Commission (FERC) rules. Additionally, access would need to meet requirements under the Montana Intertie Agreement and its successor arrangements upon renewal. The following map outlines how PSE’s current Montana resources are entering the transmission system: