Washington Geothermal Play Fairway Analysis Technical Report


An investment of $0.7M from the Geothermal Technology Office for Phase 2 of Play Fairway Analysis in Washington State improved existing favorability models and increased model confidence. New 1:24,000-scale geological mapping, 15 detailed geophysical surveys, 2 passive seismic surveys, and geochronology collected during this phase were coupled with updated and detailed structural modeling and have significantly improved the conceptual models of three potential blind geothermal systems/plays in Washington State, the St. Helens Shear Zone, Mount Baker, and Wind River Valley. Results of this analysis reveal the presence of commercially viable undiscovered geothermal resources in all three study areas. The analysis additionally provides a clear definition of the geothermal prospects in terms of the essential elements of a functioning geothermal system, the confidence in these assessments, and associated potential and risk of development.

This report also includes a proposal to validate the modeling results in highly favorable areas for two main reasons: (1) to develop confidence in the modeling approach that will encourage future development of geothermal resources in Washington State inside and outside of the Phase 2 study areas, and (2) to provide actionable results to the DOE, existing industry partners, newly identified developers, and other renewable-energy stakeholders. The proposed validation activities aim to collect new data that will further the understanding of geothermal resource potential in Washington, as well as substantiate the favorability, confidence, and risk models developed in Phases 1 and 2.

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Additional Info

DOE Project Name: Geothermal Play-Fairway Analysis of Washington State Prospects
DOE Project Number: EE0006728
DOE Project Lead: Eric Hass
Last Updated: over a year ago
Data from December, 2017
Submitted Dec 27, 2017


Washington Geological Survey



Publicly accessible License 


Alex Steely
Washington Geological Survey Department of Natural Resources
Corina Forson
Washington Geological Survey Department of Natural Resources
Trenton Cladouhos
AltaRock Energy Inc
Mike Swyer
AltaRock Energy Inc
Nicholas Davatzes
Temple University
Megan Anderson
Colorado College
Brent Ritzinger
United States Geological Survey
Jonathan Glen
United States Geological Survey
Jared Peacock
United States Geological Survey
William Schermerhorn
Western Washington University
Erick Burns
United States Geological Survey
Pete Stelling
Western Washington University


geothermal, energy, washington, play fairway, exploration, investigation, site, characterization, geophysic, pfa, washington state, geospatial data, velocity, grid files, strain, favorability


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