Madison Gas & Electric; 608-252-7117 (Home energy line); www.mge.com/home/appliances/water_heaters.htm; Downloadable primer on water heater options.
Focus on Energy; 800-762-7077; www.wifocusonenergy.org; Info on renewable energy, general home energy efficiency and cash-back reward programs.
Madison Environmental Group; 608-280-0800; www.madisonenvironmental.com
Midwest Renewable Energy Association; www.the-mrea.org; Look under "Resources and Links" and then "Certified Cite Assessors" for a list of businesses that provide solar assessments.
U.S. Department of Energy-Energy Efficiency and Renewable Energy; www.eere.energy.gov/consumer/your_home/water_heating; Guide to new water heaters and hints for improving the efficiency of your old heater. Also a worksheet that helps you determine how large a heater you need for your household.
American Council for an Energy-Efficient Economy; www.aceee.org/consumerguide/waterheating.htm; Excellent guide to replacement options or saving without replacing your current heater.