"Report Argues for a Decentralized System of Renewable Power Generation" - Green Inc. Blog - NYTimes.com

Note the estimate here that NC could meet 28% of its energy needs with rooftop solar installations. The full report here says we can generate 8% of our need from ONshore windpower and 200% from offshore. It goes on to show land area required for the solar application (.49%) and then other figures for geothermal, etc.