FERC seeks comment on license app for Clark Canyon Hydro project in Montana

The Federal Energy Regulatory Commission issued a Feb. 23 notice about a November 2015 application from Clark Canyon Hydro LLC for an original license for the Clark Canyon Dam Hydroelectric Project, to be located in the Town of Dillon, Beaverhead County, Montana.

The deadline for filing motions to intervene and protests, comments, terms and conditions, recommendations, and prescriptions is 30 days from the issuance date of this Feb. 23 notice. Reply comments are due 45 days from the issuance date of this notice. This application has been accepted for filing and is now ready for environmental analysis.

The Clark Canyon Dam Hydroelectric Project would utilize the U.S. Bureau of Reclamation’s Clark Canyon Dam and outlet works including an intake structure and concrete conduit in the reservoir. It would consist of these new facilities:

  • a 360-foot-long, 8-foot-diameter steel penstock within the existing concrete conduit, ending in a trifurcation;
  • two 35-foot-long, 8-foot-diameter penstocks extending from the trifurcation to the powerhouse, transitioning to 6-foot-diameter before entering the powerhouse;
  • a 10-foot-long, 8-foot-diameter steel penstock leaving the trifurcation and ending in a 7-foot-diameter cone valve and reducer to control discharge into the existing outlet stilling basin;
  • a 65-foot-long, 46-foot-wide reinforced concrete powerhouse containing two vertical Francis-type turbine/generator units with a total capacity of 4.7 MW;
  • two 25-foot-long steel draft tubes transitioning to concrete draft tube/tailrace section;
  • a 17-foot-long, 15-foot-diameter tailrace channel connecting with the existing spillway stilling basin;
  • a 45-foot-long, 10-foot-wide aeration basin downstream of the powerhouse with three frames containing 330 diffusers;
  • a 1,100-foot-long, 4.16-kV buried transmission line from the powerhouse to a substation;
  • a substation containing step-up transformers and switchgear; and
  • a 7.9-mile-long, 69-kV transmission line extending from the project substation to the Peterson Flat substation (the point of interconnection).

The estimated annual generation of the Clark Canyon Dam Project would be 15.4 gigawatthours. All project facilities would be located on federal lands owned by the U.S. Bureau of Reclamation and the U.S. Bureau of Land Management. The applicant proposes to operate the project as run-of-release.

The applicant contact is: John Gangemi, (406) 249-3972, john.gangemi@erm.com.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.