gov

US Department of Energy:
http://www1.eere.energy.gov/solar/sh_basics_water.html

Institut für Solartechnik SPF
European solar panel / system testing group

http://www.solarenergy.ch

RETScreen Solar Sizing tools
http://www.retscreen.net/ang/home.php

org

SRCC Solar Rating Corporation
http://www.solar-rating.org

Northeast Sustainable Energy Association
http://www.nesea.org

The Florida Solar Energy Center (FSEC)

http://www.fsec.ucf.edu

The Database of State Incentives for Renewable Energy (DSIRE):

http://www.dsireusa.org

Clean Energy Maine
http://www.mainegreenpower.org/cleanenergymaine

Midcoast Green Collaborative
http://www.midcoastgreencollaborative.org/

com

Additives Inc.
Closed Loop System Heat Transfer Add Pak (CLS-AP)
http://www.additivesinc.com/heattransferfluidsaddpak.html

Homepower Magazine:
http://www.homepower.com

Maine Solar House
http://www.solarhouse.com

AOSmith Water Heaters
http://www.hotwater.com

Sourceguides Renewable Energy database
http://energy.sourceguides.com/businesses/index.shtml