Primary Heat Condenser This report describes conditions and costs at which quite small (100 to 1 ,O00 kilowatt) geothermal systems could be used for off-grid powering at remote locations. This is a first step in a larger process of determining locations and conditions at which markets for such systems could be developed.

Over the last three decades the U. S. geothermal power-generation industry has grown to be the largest in the world, with over 27W MW of installed electrical capacity. Growth during the first two decades (1960-1980) was characterized by a single utiliry ' s development of one dry-steam resource. After 1983, growth shifred toward independent power producers, and development of water-dominated geothermal resources at several locations. I n the absence of significant changes in demand, incentives, or the regulatory process, new geothermal generating capacity, through 1995, will probably not exceed 500 MU! 7he U. S. geothermal industry must increase its inventory of characterized geothermal reservoirs in order to meet the expected demand for rapid geothermal development before the year 2000.

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Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. 5. Fracture Detection Tech is iq u es Resistivity logging Borehole Televiewers 6. Seismic Techniques Surface imaging 4 0 seismic Dowithole seismic tecliiiiques Downliole wave sources Microseismic m on itoriiig Drill-bit seisniics 7. Reservoir Definition and Operation Tracers Explicit-fracture tracer test Do wii k ole fluid analyzer 8. Numerical Simulation Explicit representation of fractures Fracture opeiiiiig as a fuiictioii of effective stress Shear deformation aiid associated jacking of fractures Relationship between fracture aperture and conductivity Ch arineling in fractures Tltermo-elastic effects Mineral deposition and dissolution Tracer module Multi-phase flo w

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