Northern Greeley Area Transmission Project


Voltage: 115/230 kV line
Estimated cost: $65 million
Target in-service: 2020

The Northern Greeley Area Project will increase electric reliability and load-serving capability of the Xcel Energy electric transmission system in and around the Greeley area. The approximately 25 miles of new 115 kilovolt (kV) and 230 kV transmission lines will be a first step to replace the existing 44 kV system in the area with higher voltage transmission facilities. The 44 kV system is one of the oldest transmission assets owned by Xcel Energy with some of the infrastructure dating back to the early 1900’s. The 44 kV voltage is no longer a standard industry voltage.

The Northern Greeley Project has been a part of the company’s long-range transmission plans since 2013 and has been presented and documented in numerous forums and reports, including annual Rule 3206 Reports and Rule 3627 Plans.

The plan aligns with the objectives of the SB100-07 statute by starting to establish transmission into a proven energy resource zone, which could provide future interconnection opportunities for wind resources in the area.

Regulatory Filings

Xcel Energy filed a Certificate of Public Convenience and Necessity (CPCN) application with the Colorado Public Utilities Commission (CPUC) on March 9, 2017 to construct the Northern Greeley Area Plan. When proposing a high voltage transmission line project, investor-owned utilities must file a CPCN application with the CPUC. You can review all regulatory filings on the CPUC web site by entering 17A-0146E in the ‘Proceeding Number’ field.  The CPCN process allows the Company to proceed with implementation, but does not decide the specific routes and locations of the transmission lines and other infrastructure. Those issues are determined through a separate local government siting process.

Project Components

The Northern Greeley Area Transmission Project consists of the following components:

  • Ault – Husky 230 kV transmission line
    • The line will be built from the existing Western Area Power Administration (WAPA) Ault Substation to a new Xcel Energy Husky Substation. Husky is expected to be located near the existing Xcel Energy 44 kV Ault Substation (different than the substation of the same name operated by WAPA). The transmission will be approximately seven miles long and built double-circuit 230 kV capable. Only one circuit will initially be installed and operated at 230 kV.
  • Husky Substation
    • This new substation will replace the Xcel Energy Ault 44 kV Substation, which will be decommissioned. The Husky Substation will also accommodate distribution upgrades.
  • Husky – Graham Creek 115 kV line
    • The new line will be approximately seven miles and be built double-circuit 230 kV capable. Only one circuit will initially be installed and operated at 115 kV.
  • Graham Creek Substation
    • This new substation will replace the Xcel Energy Eaton 44 kV Substation, which will be decommissioned. The Graham Creek Substation will be constructed to accommodate distribution upgrades.
  • Graham Creek – Cloverly 115 kV line
    • This new line will be approximately eleven miles and be built double-circuit 230 kV-capable. Only one circuit will initially be installed and operated at 115 kV. Eight miles of that new transmission will be built double-circuit 230 kV capable. The remaining three miles are already constructed to be 115 kV capable.
  • Modify Cloverly Substation
    • Two transformers will be added to the Cloverly Substation as part of the termination of the new line from Graham Creek and to allow for future load interconnection requests. The Cloverly modifications will also accommodate distribution upgrades. Cloverly Substation will eventually replace the Pleasant Valley Substation, which will be decommissioned.