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EA-1759: Final Environmental Assessment

 Southwest Alaska Regional Geothermal Energy Project Naknek, Alaska

The U.S. Department of Energy (DOE) is proposing an action (the Proposed Action) to fund the construction, operation, drilling, well logging, completion, installation of a seismic monitoring network, and testing of two of the exploratory geothermal wells (G2 and G3) and stimulation of one well (G1, G2, or G3), if feasible, on a 49-hectare (120-acre) parcel of land in southwest Alaska. The Naknek Electric Association (NEA) owned land is approximately 8 kilometers (km) (5 miles [mi]) northeast of King Salmon (Figure 1.0-1). Existing infrastructure includes a gravel road to the project area, two gravel pads connected by a gravel road, and a single exploratory geothermal well (G1), currently being drilled. Geothermal conditions are being investigated at various depth intervals to evaluate the potential for commercial production of geothermal fluids by conventional means (i.e., by self-flow or pumping without special stimulation of the rock formation). The permeability of the rock formation in a conventional geothermal reservoir is typically high enough to allow hot, trapped water (heated by the rock formation) to flow naturally to the surface during drilling.