Longview reports progress on 2,000-MW pumped storage project

Longview Energy Exchange LLC told the Federal Energy Regulatory Commission on Oct. 25 that it has made recent progress in the feasibility stage for its up to 2,000 MW Longview Pumped Storage Hydroelectric Project in Arizona.

The commission issued a preliminary permit to Longview for this project in April 2012. The Oct. 25 filing was the third, six-month report on progress with the project. If the project passes the feasibility test, then the company would need to seek a license with FERC.

In the most recent six-month period, Longview said it has completed or continued the following development activities:

  • completed a comprehensive economic feasibility study and resulting detailed economic pro forma in May;
  • completed a transmission power flow study in July which demonstrated the feasibility of various transmission options;
  • met with Arizona utilities in August to increase understanding of how they may participate in the project;
  • entered into an agreement with a major power turbine manufacturer to support the project development with turbine engineering and technical resources; and
  • maintained and grew the Integrated Project Team comprised of hydropower and transmission engineering, utility, energy market, regulatory, environmental, and legal experts.

Longview said that the Longview Project was evaluated in the Western Electricity Coordinating Council (WECC) study of the capabilities and effects of different firming methods on the flows, dispatch, and overall variable costs of the Western Interconnection.

Over the next six months, Longview intends to pursue the following development activities:

  • initiate discussions with potential project-partners;
  • continue engineering assessment of project design and configuration; and
  • continue assessment of transmission integration.

This would be a closed-loop system with up to two upper reservoirs

This project would be located at Ash Fork City in Yavapai County, Ariz. The project has a potential to develop up to 2,000 MW. It would be a closed-loop pumped storage project with features that would include:

  • one or two upper reservoirs constructed of rock fill, with a lined reservoir bottom, spillway, and a dam drainage and seepage monitoring system;
  • a single lower reservoir dam constructed of earth fill materials with an internal dam drainage system and spillway;
  • a 500-foot-long by 100-foot-wide and 150-foot-high reinforced concrete powerhouse containing six units, with three operating on each upper reservoir;
  • a 38-mile-long, 500-kV transmission line extending from the project to an interconnection with the existing Arizona Public Service owned and operated Eldorado-Moenkopi 500-kV line; and
  • a 27-mile-long, 500-kV transmission line extending from the project to an interconnection with an existing Western Area Power Administration owned and operated 230-kV line (to be upgraded to 500-kV).

The estimated annual generation of the Longview Pumped Storage Project would be 35,040 gigawatt-hours. The project would not be located off of a perennial surface water source. Water to initially fill the reservoirs and required make-up water would be pumped from local groundwater sources.

The company contact, at (314) 292-5333, is Mitchell Wexler, Manager.

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.