| Abbreviation | Definition |
|---|---|
| ECAM | Energy Charting and Metrics |
| ECAP | Energy and Climate Action Plan |
| ECAP | Energy Crisis Assistance Program |
| ECBC | Energy Conservation Building Code |
| ECCE | Energy Conversion Congress and Exhibition |
| ECCE | Energy Conversion Congress and Exposition |
| ECCS | Energy Coalition for Contractor Safety |
| ECCU | Energy Capital Credit Union |
| ECDM | Energy Conservation and Demand Management |
| ECE | East Central Energy |
| ECEE | Electrical Computer and Energy Engineering |
| ECEP | Energy Conservation and Environment Project |
| ECER | Energy Conservation and Emission Reduction |
| ECH | Energy Climate House |
| ECIC | Energy Civil Infrastructure and Climate |
| ECIC | Energy Civil Infrastructure Climate |
| ECIP | Energy Conservation and Investment Program |
| ECIP | Energy Conservation Incentive Program |
| ECIP | Energy Conservation Investment Program |
| ECIP | Energy Crisis Intervention Program |