Ormat to Begin Geothermal Well Testing Near Mammoth Lakes

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Bureau of Land Management, California

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Central California District Office

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Pipes and equipment at a geothermal injection pad. (Assaf Weinberg/Ormat Nevada Inc.)

MAMMOTH LAKES, Calif. - Ormat Nevada Inc. has completed preparations for a 30-day flow and injection test of two existing geothermal wells near the Town of Mammoth Lakes. The test was approved by the Bureau of Land Management Bishop Field Office, in coordination with the Inyo National Forest Mammoth Lakes Ranger District, earlier this month. Testing is scheduled to begin on Friday, Aug. 25.

The purpose of the flow and injection test is to allow Ormat to collect data needed to determine the potential production and injection capabilities of the two wells and their potential contribution to the overall geothermal energy production strategy in the area. In a coordinated effort, the U.S. Geological Survey and the Mammoth Community Water District will simultaneously be collecting monitoring data from nearby groundwater wells.

“Because this test has the potential to produce measurable responses in the hydrologic system, it provides a great opportunity to monitor potential responses in both the deep geothermal reservoir and the shallower groundwater reservoir,” stated BLM Bishop Field Manager Steve Nelson. “I truly appreciate the commitment to a coordinated monitoring approach that Ormat, U.S. Geological Survey and Mammoth Community Water District have shown in preparation for this test.”

The public will continue to notice increased activity and vehicle traffic along Sawmill Cutoff Road, between the town of Mammoth Lakes and Shady Rest Park, as crews conduct the test. Steam plumes rising from the test site, which is located just northwest of Shady Rest Park, will be visible to area visitors. All roads and recreational trails near the area are expected to remain open for public use during the 30-day test period.

The America First Energy Plan is an all-of-the-above plan that includes oil and gas, strategic minerals, and renewable sources such as wind, geothermal, and solar – all of which can be developed on public lands.

For more information on geothermal well testing, please contact Mark Spendel, geologist, BLM Bishop Field Office, at 760-872-5012.


The BLM manages more than 245 million acres of public land located primarily in 12 western states, including Alaska, on behalf of the American people. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. Our mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations.