| Petal Gas Storage Extension | Petal Gas Storage, L.L.C | MS | In service 2002 | |
| Petal III Compression Project | Gulf South Pipeline Company, LLC | | In service 2020 | |
| Petersburg Compressor Station | Columbia Gas Transmission, LLC | VA | In service 2025 | |
| Petersburg Compressor Station Replacement | Columbia Gas Transmission, LLC | VA | | |
| Petro-Marine coastal use permit P19970847 pipeline | Petro-Marine | LA | | |
| PetroLogistics Gas Storage Project | PetroLogistics Natural Gas Storage | LA | In service 2009 | |
| Petrologistics Lateral | Acadian Gas Pipeline System | LA | In service 2012 | |
| Petronila Compressor Station | | TX | In service 2019 | |
| Petroquest Energy coastal use permit P20010824 pipeline | Petroquest Energy, LLC | LA | | |
| Petroquest Energy coastal use permit P20011584 pipeline | Petroquest Energy, LLC | LA | | |
| Petroquest Energy coastal use permit P20031365 pipeline | Petroquest Energy, LLC | LA | | |
| Petroquest Energy coastal use permit P20051628 pipeline | Petroquest Energy, LLC | LA | | |
| Petroquest Energy coastal use permit P20120448 pipeline | Petroquest Energy, LLC | LA | | |
| Petroquest Energy coastal use permit P20120800 pipeline | Petroquest Energy, LLC | LA | | |
| Phase II of the Portland XPress Project | Portland Natural Gas Transmission System | MA, ME | In service 2019 | |
| Phase IV Expansion | Florida Gas Transmission Company, LLC | AR, LA | In service 2001 | |
| Phase IV Expansion (II | Maritimes & Northeast Pipeline | MA, ME | In service 2008 | |
| Phase IV Project/HP(add CP07-51 P/L for total | Gulfstream Natural Gas System LLC | AL, FL | In service 2008 | |
| Phase V Expansion | Florida Gas Transmission Company, LLC | AL, FL, MS | | |
| Phase VII Expansion (Phase I and II | Florida Gas Transmission Company, LLC | FL | In service 2007 | |
| Phase VIII Expansion Project | Florida Gas Transmission Company, LLC | AL, FL | In service 2011 | |
| Philadelphia Lateral Expansion Project | Texas Eastern Transmission, LP | PA | In service 2012 | |
| Phillips 66 Pipeline coastal use permit P20001297 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20010870 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20020552 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20021209 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20030115 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20041389 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20061596 pipeline | Phillips 66 Pipeline LLC | LA | | |
| Phillips 66 Pipeline coastal use permit P20100491 pipeline | Phillips 66 Pipeline LLC | LA | | |