EG&G GEOTHERMAL POWER PLANT PROJECT FOR D.O.E IN IDAHO. Architect's rendering depicts $6.68 million Raft River Valley Thermal Loop Facility for 5 MW pilot power plant in Idaho. Now being built, this EG&G-supported complex will perform geothermal power production experiments for the U.S. Department of Energy (DOE) . In a binary cycle loop, geothermal water from the earth's depths will heat the isobutane driving fluid for a $1.2 million turbine generator. Construction, under the management of EG&G Idaho, Inc., EG&G's largest subsidiary, will be completed by early 1980