Economics of a conceptual 75 MW Hot Dry Rock geothermal electric power station
Man-made, Hot Dry Rock (HDR) geothermal energy reservoirs have been investigated for over ten years. As early as 1977 a research-sized reservoir was created at a depth of 2.9 km near the Valles Caldera, a dormant volcanic complex in New Mexico, by connecting two wells with hydraulic fractures. Thermal power was generated at rates of up to 5 MW(t) and the reservoir was operated for nearly a year with a thermal drawdown less than 10/sup 0/C. A small 60kW(e) electrical generation unit using a binary cycle (hot geothermal water and a low boiling point organic fluid, R-114) was operated. Interest is now worldwide with field research being conducted at sites near Le Mayet de Montagne, France; Falkenberg and Urach, Federal Republic of Germany; Yakedake, Japan; and Rosemanowes quarry in Cornwall, United Kingdom. To assess the commercial viability of future HDR electrical generating stations, an economic modeling study was conducted for a conceptual 75 MW(e) generating station operating at conditions similar to those prevailing at the New Mexico HDR site. The reservoir required for 75 MW(e), equivalent to 550 MW of thermal energy, uses at least 9 wells drilled to 4.3 km and the temperature of the water produced should average 230/sup 0/C. Thermodynamic considerations indicate that a binary cycle should result in optimum electricity generation and the best organic fluids are refrigerants R-22, R-32, R-115 or R-600a (Isobutane). The break-even bus bar cost of HDR electricity was computed by the levelized life-cycle method, and found to be competitive with most alternative electric power stations in the US.
- Research Organization:
- Los Alamos National Lab., NM (USA); Massachusetts Inst. of Tech., Cambridge (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5148149
- Report Number(s):
- LA-UR-83-2258; CONF-840508-1; ON: DE83015926
- Resource Relation:
- Conference: Seminar on utilization of geothermal energy for electric power production and space heating, Florence, Italy, 14 May 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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GEOTHERMAL POWER PLANTS
ECONOMICS
HOT-DRY-ROCK SYSTEMS
BINARY-FLUID SYSTEMS
FEDERAL REPUBLIC OF GERMANY
FRANCE
GEOTHERMAL WELLS
JAPAN
NEW MEXICO
POWER RANGE 10-100 MW
REFRIGERANTS
UNITED KINGDOM
ASIA
ENERGY SYSTEMS
EUROPE
FEDERAL REGION VI
FLUIDS
GEOTHERMAL SYSTEMS
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WELLS
WESTERN EUROPE
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