| Abbreviation | Definition |
|---|---|
| ECIU | Energy and Climate Intelligence Unit |
| ECM | Energy Conservation Measures |
| ECM | Energy Conversion and Management |
| ECO | Energy Companies Obligation |
| ECO | Energy Company Obligation |
| ECO | Energy Correction Options |
| ECOE | Energy Center Of Expertise |
| ECOP | Energy Conservation Observation Platform |
| ECP | Energy Conservation Plan |
| ECPA | Energy and Climate Partnership of the Americas |
| ECPD | Energy Climate Policy Division |
| ECPL | Energy Control and Power Lockout |
| ECRB | Energy Community Regulatory Board |
| ECS | Energy Communication and Services |
| ECS | Energy Communications and Services |
| ECSG | Energy Cost Solutions Group |
| ECSP | Energy Cost Savings Program |
| ECT | Energy Charter Treaty |
| ECTF | Energy Cooperation Task Force |
| ECV | Energy Capital Vietnam |