| Abbreviation | Definition |
|---|---|
| LFG | Land Fill Gas |
| LGE | Laser Guided Energy |
| LGE | Leveraged Green Energy |
| LGEA | Local Government Energy Audit |
| LGEEP | Local Government Energy Efficiency Program (California) |
| LHC | Light Harvesting Complex |
| LHE | Light Heat Energy |
| LIEC | Least Input Energy Control |
| LIEC | Lulu Island Energy Company |
| LIEE | Low Income Energy Efficiency |
| LIEN | Low Income Energy Network |
| LIER | Liaoning Institute of Energy Resources |
| LIFE | Laser Inertial Fusion Energy |
| LIHEAP | Low Income High Energy Assistance Program |
| LIHEAP | Low Income Home Energy Assistance Program |
| LLBH | Live Line Bare Hand |
| LLE | LAT Low Energy |
| LLEC | Living Lab Energy Campus |
| LMEL | Lloyds Metals and Energy Limited |
| LMEL | Lloyds Metals and Energy Ltd |