| Abbreviation | Definition |
|---|---|
| CHEERS | California Home Energy Efficiency Rating Services |
| CHEESE | Cold Home Energy Efficiency Survey Experts |
| CHEFU | Clocked High Energy Firing Unit |
| CHEP | Conference on High Energy Physics |
| CHESS | Cornell High Energy Syncrotron Source |
| CHOSE | Centre for Hybrid and Organic Solar Energy |
| CHP | Combined Heat and Power |
| CICE | Chambers for Innovation and Clean Energy |
| CIDEM | Center for Inherited Disorders of Energy Metabolism |
| CIE | Cobalt International Energy |
| CIEC | Connecticut Industrial Energy Consumers |
| CIED | Centre on Innovation and Energy Demand |
| CIEEDAC | Canadian Industrial Energy End-use Data and Analysis Centre |
| CIEG | China International Energy Group |
| CIEP | Certified Industrial Energy Professional |
| CIEP | Clingendael International Energy Programme |
| CIER | Centre for Integrated Energy Research |
| CIPEC | Canadian Industry Program for Energy Conservation |
| CIPEC | Canadian Industry Programme for Energy Conservation |
| CIRG | Community-Industry Response Group |