| Abbreviation | Definition |
|---|---|
| CREP | Comprehensive Renewable Energy Plan |
| CRES | Center for Reliable Energy Systems |
| CRES | Certified Refrigeration Energy Specialists |
| CRES | Citizens for Responsible Energy Solutions |
| CRES | Colorado Renewable Energy Society |
| CRESL | Center for Renewable Energy Services Limited |
| CREW | Clean Renewable Energy Worldwide |
| CSE | Center for Sustainable Energy |
| CSEC | Comprehensive Sustainable Energy Committee |
| CSEDS | Combined State Energy Data System |
| CSEP | Caribbean Sustainable Energy Project |
| CSER | Centre for Solar Energy Research |
| CSER | Computational Sciences for Energy Research |
| CSTPS | Chandrapur Super Thermal Power Station |
| CSURE | Challenges for Scaling Up Renewable Energy |
| CTEE | Caltech Taiwan Energy Exchange |
| CTEE | Controlled Thermal Energy Engineering |
| CTES | Corporate Technical and Energy Services |
| CUE | City University Energysaver |
| CURES | Citizens United for Renewable Energy and Sustainability |