| Abbreviation | Definition |
|---|---|
| AAEA | Arab Atomic Energy Agency |
| AAEC | Advanced Alternative Energy Corp |
| AAEC | Advanced Alternative Energy Corporation |
| AAEC | Australian Atomic Energy Commission |
| AAET | Advanced Alternative Energy Technologies |
| AAEW | All Africa Energy Week |
| ABBK | Abengoa Bioenergy Biomass of Kansas |
| ABEA | Association of Bulgarian Energy Agencies |
| ABEE | Avesta Battery and Energy Engineering |
| ABEE | Avesta Battery Energy Engineering |
| ABER | Alan Brown Energy Resources |
| ABOVE | AB Omnès Visser Energy |
| ACAES | Adiabatic Compressed Air Energy Storage |
| ACCESS | Argonne Collaborative Center for Energy Storage Science |
| ACE | Appetite Control and Energy |
| ACEE | Andlinger Center for Energy and the Environment |
| ACEF | Africa Clean Energy Finance |
| ACEF | Asia Clean Energy Forum |
| ACEG | a Clean Energy Grid |
| ACEP | Alaska Center for Energy and Power |