An introduction to geothermal energy is provided in this discussion of: (1) how a geothermal reservoir works; (2) how to find geothermal energy; (3) where it is located; (4) electric power generation using geothermal energy; (5) use of geothermal energy as a direct source of heat; (6) geopressured reservoirs; (7) environmental effects; (8) institutional and legal problems associated with geothermal energy; (9) economic considerations; (10) hot dry rock; and (11) future prospects. Eight resources available from the National Technical Information Service (NTIS) are listed. Each entry includes title, author(s), annotation, publication date, and current cost. (JN)