ATTRA: Solar Energy and Directory of Energy Alternatives by state. ATTRA is the National Sustainable Agriculture Information Service managed by the National Center for Appropriate Technology (NCAT) and is funded under a grant from the U.S. Department of Agriculture’s Rural Business-Cooperative Service.
U.S. Department of Energy (DOE), provides information on space and water heating, greenhouse heating, electricity, crop and grain drying.
NREL: Photovoltaic Applications
from the National Renewable Energy Laboratory (NREL) hosts webpages for Photovoltaic Systems (PV) and Solar Hot Water.
FarmEnergy.org, sponsored by the Environmental Law & Policy Center (ELPC) provides information on the Energy Title programs of the Federal Farm Bill and energy efficiency and renewable energy opportunities that benefit farmers, ranchers and rural communities.