The U.S. Bureau of Land Management said in a notice to be published in the July 5 Federal Register that it is about to issue the final environmental impact statement for the 33-MW Casa Diablo IV Geothermal Development Project.
The project is located near the town of Mammoth Lakes in Mono County, Calif. It is being pursued by ORNI 50 LLC, a wholly owned subsidiary of Ormat Nevada Inc.
The BLM will not issue a final decision on the proposal for a minimum of 30 days after the date that the U.S. Environmental Protection Agency publishes its notice of availability in the Federal Register. That EPA notice is also in the July 5 Federal Register.
The purpose and need for action is to respond to an application to construct and operate the Casa Diablo IV project on federal geothermal leases administered by the BLM Bishop Field Office. The project would be located on Inyo National Forest lands and adjacent private lands within portions of four federal geothermal leases. The project would be located adjacent to three currently operating geothermal plants.
The 33-MW binary geothermal power plant would include up to 16 wells for production and injection, drilled 1,600 to 2,500 feet deep. Pipelines would be constructed to transport geothermal fluid from production wells to the power plant and the return of fluids from the power plant to injection wells. A 650-foot-long transmission line would connect the new power plant to the Southern California Edison substation at Substation Road.
The power plant, access roads, well pads, pipelines, and transmission line would occupy approximately 80 acres. Of the 16 proposed production/injection well locations, 14 were previously analyzed and approved by the BLM as exploration wells. Three of these exploration wells have already been drilled as of the time of the publication of this notice.