Gridflex looks at 250-MW pumped storage hydro project in Nevada

The Rose Creek Hydro LLC affiliate of Gridflex Energy LLC applied Sept. 12 at the Federal Energy Regulatory Commission for a preliminary permit for the 250-MW Rose Creek Pumped Storage Project in Mineral County, Nev.

A preliminary permit, if granted, gives a party the right to three years of exclusive time to look at project feasibility, with a license application then needed if the decision is to move forward with the project.

The project consists of an expanded existing reservoir (Rose Creek Reservoir) as upper reservoir and a new lower reservoir, joined by approximately 12,300 feet of conduit. An underground powerhouse will be constructed between the two reservoirs. Maximum hydraulic head will be 2,380 feet. Equipment will tentatively consist of two 125 MW pump and turbine sets, totaling 250 MW. Annual energy production is projected to be about 547,500 MWh.

The project would propose to interconnect with either: the Dixie Valley-Oxbow transmission line, via a new 20-mile, 230-kV transmission line; or Sierra Pacific Power’s Thorne substation, via a new 150-mile, 230-kV transmission line.

The project is intended to provide desalination service to Walker Lake as well as power to regional utilities. To fulfill that function, fill water for the pumped storage operation would be continuously cycled through the plant on behalf of existing water rights holders or others with jurisdiction over Walker Lake waters.

“The Project will provide peaking capacity and fast-responding ancillary services support to markets in California and Nevada,” said the application. “The Project will also be operated to provide support to new renewable resources being interconnected to the regional transmission grid currently and in the future, including peak-shifting to geothermal power generation. The Project as proposed would also provide desalination service to Walker Lake through hydraulic reverse osmosis.”

Contact information is: Matthew Shapiro, CEO, Gridflex Energy LLC, 
1210 W. Franklin St., Ste. 2, Boise, ID 83702, Phone: (208) 246-9925,

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.