There are many good resources that provide additional details about renewable energy and energy efficiency policy in the U.S. Here are a few more places to check out:

• American Council for an Energy-Efficient Economy (ACEEE) - ACEEE is an advocate for EERE policies and has many resources on its website.
• Consortium of Energy Efficiency (CEE) - CEE is a group of utilities that encourages energy efficiency and promotes efficiency targets that can be adopted into utility-level voluntary incentive programs.
• Database of State Incentives for Renewables & Efficiency (DSIRE) - Database for many state-level policies used in this project.
• U.S. Department of Energy (DOE) and its Office of Energy Efficiency and Renewable Energy (EERE).
• The Energy Information Administration (EIA) - EIA is a federal agency tasked with collecting energy statistics.
• ENERGY STAR - A voluntary federal program that certifies technologies meeting certain efficiency levels. These levels are sometimes used for incentive programs by a variety of sectors.