Implementation of a Demonstration EGS Project at Naknek, Alaska Geothermal Project

Jump to: navigation, search


Last modified on July 22, 2011.

Project Title Implementation of a Demonstration EGS Project at Naknek, Alaska
Project Type / Topic 1 Recovery Act: Enhanced Geothermal System Demonstrations
Project Type / Topic 2 EGS Demonstration

Project Description NEA is about to begin drilling a deep, full-diameter well (Naknek-G #1, or simply G-1) that will be spudded in August 2009. Because the anticipated temperature gradient in the Naknek area is comparable to most areas of the earth and does not appear to be elevated, this well will be cased to 10,000 feet and drilled to a total depth (TD) of up to 14,000 feet. Considering the lack of surface features that would suggest the presence of a conventional hydrothermal resource, NEA is preparing for the need to develop geothermal power using EGS techniques. The Naknek EGS project provides an opportunity to demonstrate EGS technology in an environment that can support higher energy costs than most places in the United States, and has normal temperature gradients. These characteristics will enable the Naknek EGS project to serve as a blueprint for EGS development not only in many remote regions of Alaska, but also across broad areas of the United States that have normal temperature gradients. Further, it serves as a stepping stone to a regional geothermal power initiative for Southwest Alaska.
State Alaska
Objectives Develop a 25 MW generation plant, district heating system and interconnection will serve eight communities in the Northern Bristol Bay area, and with growth up to 50 MW for a larger region of Southwestern Alaska. The project will increase economies of scale, replace not displace the use of No.1 and No.2 diesel fuel, and reduce costly and potentially hazardous transportation of fossil fuels along habitat sensitive waterways in Bristol Bay, home of the world’s largest wild salmon runs.
Awardees (Company / Institution) Naknek Electric Association

Awardee Website http://www.nea.coop/
Partner 1 GeothermEx
Partner 2 GeoMechanics International
Partner 3 Alaska Earth Sciences
Partner 4 The Castle Mountain Group
Partner 5 U.S. Geological Survey
Partner 6 University of Utah
Partner 7 University of Wisconsin
Partner 8 University of Aukland



Funding Opportunity Announcement DE-FOA-0000092

DOE Funding Level (total award amount) $12,376,568.00
Awardee Cost Share $18,970,500.00
Total Project Cost $31,347,068.00



Principal Investigator(s) Donna Vukich, General Manager, Naknek Electric Association
Other Principal Investigators Stephanie Prejean, U.S. Geological Survey; Steve Hickman; Peter Rose, University of Utah; Clifton Thurber, University of Wisconsin; Peter Malin, University of Auckland.

Targets / Milestones - Phase I activities focus on characterizing the rocks encountered in well G-1 in ways that will facilitate the development of an EGS reservoir. A key element in the plan is the determination of stress field orientation and the dominant mode of faulting in the area. The stress field will be evaluated using a variety of methods: 1) geology; 2) seismology to determine the mode(s) of faulting; 3) acquisition and analysis of density and downhole image logs in well G-1; 4) an extended leak-off test or “mini-frac”; and 5) after installing an appropriate seismic monitoring network and developing an induced seismicity protocol (including public outreach), the design, execution and analysis of a “pre-stimulation” injection test in well G-1 to confirm the direction of reservoir “growth” during the full stimulation.


- Phase II involves full stimulation, a second well would be drilled into the stimulated zone in Phase II, completing the production-injection doublet. As the last steps in Phase II, the doublet will be tested for several months, and the data from the test analyzed to permit modeling of future reservoir behavior and to make a preliminary evaluation of the potential for scaling up to a larger development.
- Phase III goal is to generate 25 MW of geothermal power from the Naknek EGS doublet to supply the electricity needs of the three local communities, and to develop a scale-up plan based on analyses of long-term performance test data.





Location of Project Naknek, AK
58.7283333°, -157.0138889°



Impacts Naknek Electric Association (NEA) relies on diesel for its power needs, and rising fuel and electricity costs are continuing to have deleterious effects on regional communities. A 25 MW generation plant, district heating system and interconnection will serve eight communities in the Northern Bristol Bay area, and with growth up to 50 MW for a larger region of Southwestern Alaska. The project will increase economies of scale, replace not displace the use of No.1 and No.2 diesel fuel, and reduce costly and potentially hazardous transportation of fossil fuels along habitat sensitive waterways in Bristol Bay, home of the world’s largest wild salmon runs.
Funding Source American Recovery and Reinvestment Act of 2009

References EERE Geothermal Technologies Programs[1]

References

  1. EERE Geothermal Technologies Programs