| Abbreviation | Definition |
|---|---|
| FEP | Free Energy Perturbation |
| FEP | Frio Energy Power |
| FEPA | Florida Energy Pipeline Association |
| FEPC | Feed Energy Packaging and Chemicals |
| FEPE | full energy peak efficiency |
| FER | Fan Energy Ratings |
| FER | Fossil Energy Ratio |
| FERB | Forum for Energy Reporters Bangladesh |
| FERC | Federal Energy Regulatory Commissions |
| FERC | Federal Energy Relief Commission |
| FERC | Federal Energy Rubberstamp Commission |
| FERC | Fercfederal Energy Regulatory Commission |
| FES | First Energy Solutions |
| FES | Fusion Energy Sciences |
| FES | Future Energy Solutions |
| FESS | Flywheel Energy Storage System |
| FET | Forum Energy Technologies |
| FEY | Future Energy Yorkshire |
| FFED | Flex Fuel Energy Development |
| FGE | FACTS Global Energy |