| cleanpower.org | Center for Energy Efficiency and Renewable Technologies |
| cleanenergy.de | Cleanenergy: Infoportal Für Erneuerbare Energien |
| case.gov.au | International Centre for Solar Energy |
| nrglink.com | Green Energy News |
| hcipub.com | HCI Publications |
| hawaii.gov | Renewable Energy Resource Assessment Report |
| glrea.org | Great Lakes Renewable Energy Association |
| efficientwindows.org | Efficient Windows Collaborative |
| dsireusa.org | Database of State Incentives for Renewable Energy |
| energy.gov | Best Practices Energy Smart Technologies for Today |
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