The Department of Energy (DOE) recognized what it called the nation's first commercial enhanced geothermal system (EGS) project to supply electricity to the grid. Based in Churchill County, Nevada, Ormat Technologies' Desert Peak 2 EGS project has increased power output of its nearby operating geothermal field by nearly 38 percent — providing an additional 1.7 MW of power to the grid and validating this emerging clean energy technology.
Enhanced geothermal system projects capture power from intensely hot rocks, buried thousands of feet below the surface, that lack the permeability or fluid saturation found in naturally occurring geothermal power systems.
As demonstrated in this infographic, EGS technologies use directional drilling and pressurized water to enhance flow paths in the subsurface rock and create new reservoirs, capturing energy from resources that were once considered uneconomical or unrecoverable.
With the support of research and development investments across the DOE's renewable energy and oil and gas portfolios, American companies like Ormat Technologies are now taking advantage of this untapped resource. The U.S. Geological Survey estimates that EGS in the U.S. has the potential to enable development of 100 to 500 GW of geothermal resource capacity.
Leveraging a $5.4 million Energy Department investment — matched by $2.6 million in private sector funding — the Ormat Desert Peak project is extending the life of previously unproductive geothermal wells. Since the project's start in 2008, the Energy Department has worked with Ormat, GeothermEx, the U.S. Geological Survey, and Lawrence Berkeley and Sandia National Laboratories to develop cost-effective and innovative production technologies that use protective environmental best practices and monitoring.
The Desert Peak project follows achievements at two other Energy Department-supported projects focused on demonstrating the commercial viability of EGS: The Calpine demonstration project at The Geysers in Middletown, California and the AltaRock demonstration project at the Newberry Volcano near Bend, Oregon. These projects have realized important achievements in the Department's near- to long-term EGS strategy to develop resources ranging from existing fields to undeveloped or greenfield sites.
This article was originally published in Electric Light & Power/POWERGRID International. It was republished with permission.