| Koch Gateway Pipelin coastal use permit P19971125 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipelin coastal use permit P19971395 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipelin coastal use permit P19971597 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipelin coastal use permit P19980239 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipelin coastal use permit P19981001 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipelin coastal use permit P19990116 pipeline | Koch Gateway Pipeline Company | LA | | |
| Koch Gateway Pipelin coastal use permit P20000067 pipeline | Koch Gateway Pipelin | LA | | |
| Koch Gateway Pipeline coastal use permit P20010011 pipeline | Koch Gateway Pipeline Company | LA | | |
| Koch Industries coastal use permit P20010373 pipeline | Koch Industries | LA | | |
| Koch Pipeline Se coastal use permit P19971101 pipeline | Koch Pipeline Se Inc | LA | | |
| Koch Pipeline coastal use permit P19990919 pipeline | Koch Pipeline Company, L.p. | LA | | |
| Koch-Gateway Pipeline coastal use permit P20000708 pipeline | Koch Gateway Pipeline Company | LA | | |
| Kosciusko Compressor Station Replacement Project | Texas Eastern Transmission, LP | MS | | |
| Kosciusko Junction Pipeline Project | Gulf South Pipeline Company, LLC | MS | | |
| Kosciusko Junction Pipeline Project | Texas Gas Transmission, LLC | MS | | |
| L#6123 Pipeline Replacement | Dominion East Ohio Gas Company | OH | | |
| L-722 Replacement Project | East Tennessee Natural Gas, LLC | OH | In service 2022 | |
| L.L. Tonkin Compressor Station (Monroe to Cornwell Project) | Dominion Transmission, Inc. | WV | In service 2016 | |
| L.L.C./CP98-150-008 | Millennium Pipeline Company, L.L.C. | NY | In service 2008 | |
| LA Storage CP21-44 | La Storage, LLC | LA | | |
| LA Storage PF20-5 | La Storage, LLC | | | |
| LDH Energy Barnett Shale NGL Lateral | LDH Energy | TX | | |
| LEAP Aiken to McMeekin Project | Carolina Gas Transmission, LLC | SC | | |
| LEAP Pipeline | DT Midstream (DTE Energy at construction) | LA | In service 2020 | |
| LEC-Clean Energy Power Plant Pipeline Installation Project | Dominion East Ohio | OH | | |
| LG&E 12-inch Bullitt County Pipeline Project | LG&E | KY | Started 2025 | |
| LN-30 & LN-550 Pipeline Project | Dominion Transmission, Inc. | NY | | |
| LN-50 Pipeline Class Location Replacement and Testing Project | Dominion Transmission, Inc. | PA | | |
| LNG Clean Energy Project | Gulf LNG Pipeline, LLC | MS | | |
| LNG Development PF07-10 | LNG Development Company, LLC | | | |