Will the United States have enough energy to sustain and prosper its economy beyond 1985? This time frame becomes particularly significant as domestic supplies of oil and natural gas decline while the demand for energy continues to rise. The promise of more abundant energy supplies through controlled thermonuclear reaction processes and breeder reactors may not yet have materialized and indeed might never materialize. The nation will be looking toward a mix of coal, solar, nuclear, and geothermal energy sources to fulfill its needs, which may well have become acute. How well these expectations will be realized depends on preparations made and decisions taken now, 10 years earlier, since the latent period for development for many energy sources is at least that long.