Development Wells At Long Valley Caldera Geothermal Area (Associates, 1987)

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Exploration Activity: Development Wells At Long Valley Caldera Geothermal Area (Associates, 1987)

Exploration Activity Details
Location Long Valley Caldera Geothermal Area
Exploration Technique Development Wells
Activity Date 1990 - 1990

Usefulness useful
DOE-funding Unknown

Exploration Basis
Two more binary power plants (MP-II and PLES-1) came online in 1990, each with 15 MW of generating capacity, bringing the total generation of the Long Valley geothermal resource to 40 MW.
The developments included the drilling of eight additional production wells (24-32, 24A-32, 24C-32, 24D, 32, 24-32, 25A-32, 35-32, and 35A-32) and four injection wells (43-32, 43A-32, 44-32, and 44A-32) to support the two new power plants.[1] The production wells at the Casa Diablo field are relatively shallow - about 137 m deep. Pumps are used to move water flowing in the western portion of the fields to the power plants. The average production rate of geothermal fluid between the Mammoth-Pacific facility's three power plants initially ranged from 12,700 to 14,000 gpm to produce a total of 40 MWe (gross).[1] [2] [3] After being utilized for power production, the cooled fluid is injected back into the reservoir to about 610 m depth in a deep fault zone on the east side of the field.

Additional References
  1. 1.0 1.1 EGS Inc.. 2012. Technical Geologic Overview of Long Valley Caldera for the Casa Diablo IV Geothermal Development Project. San Francisco, CA: Prepared for Geologica Inc.. Report No.: Appendix D: Geologic and Geothermal Resources Technical Report.
  2. Michael L. Sorey. 2005. Hydrology of the Geothermal System in Long Valley Caldera, California. Mammoth Lakes, CA: Unpublished report for the Long Valley Hydrologic Advisory Committee.
  3. Michael L. Sorey. 2010. Hydrologic Monitoring Summary Long Valley Caldera, California. (!) : ORMAT internal report.