| Abbreviation | Definition |
|---|---|
| FGES | First Gen Energy Solutions |
| FHE | Full Heal Energy |
| FISE | Florida Institute for Sustainable Energy |
| FLAME | Faith Learning and Mad Energy |
| FLARE | Future Leaders for Advancing Renewable Energy |
| FLE | Fluorescent Light Energy |
| FLEA | Frangible Low Energy Ammunition |
| FLEET | Forever Leadout Existing Energy Transformer |
| FME | Fleming Mason Energy |
| FMEM | Facilities Maintenance and Energy Management |
| FNEC | First National Energy Corp |
| FNLE | Federazione Nazionale Lavoratori Energia (Italian: National Federation of Energy Workers |
| FORCE | Fundy Ocean Research Center for Energy |
| FORGE | Frontier Observatory for Research in Geothermal Energy |
| FPE | Fluid Power Energy |
| FPE | foot pounds of energy |
| FPY | Full Power Year |
| FREA | Florida Renewable Energy Association |
| FREA | Fukushima Renewable Energy Institute |
| FRED | Forum for Renewable Energy Development |