It is postulated that many types of renewable energy resources, like fossil fuels, are amenable to regional availability analysis. Among these are hydropower, geothermal, ocean temperature gradient, wind, and direct solar energy. A review of the spatial attributes of each of these types reveals areas of the United States that contain comparative advantages for the conversion of one or more of these alternative forms into electrical energy. Combining the results of five separate studies produces a generalized map of alternative energy supply regions within the United States. (Author/JN)