| Plasma Compressor Station | | | In service 2024 | |
| Platteville Extension | Tallgrass Pony Express Pipeline, LLC | CO | In service 2018 | |
| Pleasant Valley Compressor Station (Keys Energy Project) | Dominion Cove Point LNG, LP | VA | In service 2017 | |
| Pleasants Pipeline Phase 1 | Jay-Bee Oil & Gas, Inc. | WV | | |
| Pleasants Pipeline Phase II | Jay-Bee Oil & Gas, Inc. | WV | | |
| Plymouth Compressor Station Looping Project | Northwest Pipeline LLC | WA | In service 2009 | |
| Plymouth LNG Plant Return to Service Project | Northwest Pipeline LLC | WA | | |
| Plymouth LNG Plant Vaporizers Replacement Project | Northwest Pipeline LLC | | | |
| Point of Rocks Compressor Station (Westbound Compression Expansion) | | WY | | |
| Point of Rocks West Expansion Project | Overthrust Pipeline | WY | In service 2021 | |
| Pointe LNG PF18-8 | Pointe LNG, LLC | | | |
| Polk Pipeline | LPR Midstream | PA | | |
| Pomelo Connector Pipeline | Texas Eastern Transmission, LP | TX | In service 2018 | |
| Pompano Compressor Station 21.5 Project | Florida Gas Transmission Company, LLC | FL | Started 2014 | |
| Pony Express Expansion Newkirk Station | | | | |
| Pony Express Pipeline (new-build extension to Cushing) | Tallgrass Energy Partners | OK | In service 2014 | |
| Pony Express Pipeline Conversion Project | KM Interstate Pipeline Co | CO, KS, NE, WY | 2013–2014 | |
| Pony Express Pipeline Expansion | Tallgrass Energy | CO, WY | | |
| Port Arthur LNG Expansion Project | Sempra PALNG Holdings, LLC | | | |
| Port Arthur LNG North Project | Port Arthur LNG North, LLC | TX | | |
| Port Arthur LNG Trains 1-2 & Trains 3-4 | Port Arthur Lng, LLC | TX | Started 2023 | |
| Port Arthur Lng, Llc, Port Arthur Pipeline coastal use permit P20050484 pipeline | Port Arthur Lng, Llc, Port Arthur Pipeline, LLC | LA | | |
| Port Arthur Pipeline Louisiana Connector | Sempra Infrastructure | LA, TX | 2024–2026 | |
| Port Arthur Pipeline coastal use permit P20170105 pipeline | Port Arthur Pipeline LLC | LA | | |
| Port Arthur Pipeline coastal use permit P20170987 pipeline | Port Arthur Pipeline LLC | LA | | |
| Port Dolphin Project | Port Dolphin Energy LLC/Port Dolphin Project | FL | | |
| Porterville Modernization Project | National Fuel Gas Supply Corporation | NY | | |
| Portland Natural Gas Transmission System CP96-249 | Portland Natural Gas Transmission System | ME | | |
| Portland Natural Gas Transmission System Presidential Permit Amendment | Portland Natural Gas Transmission System | MA, ME, NH | | |
| Portland XPress Project Phase III | Portland Natural Gas Transmission System | MA, ME | In service 2020 | |