Work is heading for a June startup at a geothermal plant near Vale, Oregon, that the State Department of Energy says will be the first in Oregon to produce energy on an industrial scale. The developer, U.S. Geothermal Inc., of Boise, Idaho, plans to use heat from a 300-degree reservoir 2500 feet underground to generate power.  Idaho Power Company will buy the electricity.  A company spokesman says the 23-megawatt plant will supply enough power for about 700 homes. A Nevada Company is building a second generating plant in the southern Oregon town Adel, and that's expected to go on line in 2013.