| Air Products And Chemicals coastal use permit P20081365 pipeline | Air Products & Chemicals Inc | LA | | |
| Air Products And Chemicals coastal use permit P20111614 pipeline | Air Products & Chemicals Inc | LA | | |
| Airport Junction Compressor Station | | | | |
| Ak Steel OPSB case 98-0282-GA-BTX | Ak Steel Corp | OH | | |
| AlaTenn Pride Loop Project | BBT Alatenn, LLC | AL | Started 2025 | |
| Alabama Compressor Station Upgrade | AlaTenn Pipeline | AL, MS | 2019–2020 | |
| Alabama Georgia Connector Project | Transcontinental Gas Pipe Line Company, LLC | AL, GA | 2025 | |
| Alaska Gasline Development Alaska LNG Project | Alaska Gasline Development Corporation | | | |
| Alaska LNG | Alaska Gasline Development Corporation | AK | | |
| Alaska Nikiski LNG pipeline | 8 Star Alaska LLC | AK | | |
| Albert Lea North E-line Expansion Project | Northern Natural Gas Company | MN | 2023 | |
| Alberta Clipper (Line 67), US portion | Enbridge | ND, MN, WI | 2009–2010 | |
| Alberta Xpress Project | TC Energy | AR, IN, KY, LA, MI, MS, OH, TN | In service 2023 | |
| Alden Gas Storage Field Expansion Project | Southern Star Central Gas Pipeline, Inc. | KS | | |
| Alexander Tank Farm Crude Oil Pipeline-McKenzie | Hiland Crude, LLC | ND | | |
| Alexandria Compressor Station Replacement | Columbia Pipeline Group | LA | | |
| Alexandria-to-Grand Forks Liquid Products Pipeline | Magellan Pipeline Company, LLC | ND | | |
| Algonquin ANP Electric Lateral | | MA | In service 2001 | |
| Algonquin DPA Upgrades | | MA | In service 1999 | |
| Algonquin Electric Load Lateral | Algonquin Gas Transmission, LLC | CT | In service 1997 | |
| Algonquin Fore River Electric Lateral | | MA | In service 2001 | |
| Algonquin Gas Transmission J-2 Loop Project | Algonquin Gas Transmission, LLC | MA | 2009 | |
| Algonquin Gas Transmission PF07-15 | Algonquin Gas Transmission, LLC | | | |
| Algonquin Incremental Market (AIM) Project | Algonquin Gas Transmission (Spectra Energy) | NY, CT, MA | 2015–2017 | |
| Algonquin Kleen Energy Lateral | Algonquin Gas Transmission, LLCKleen Energy Lateral | CT | In service 2009 | |
| Algonquin Lake Road Lateral | | CT | In service 2000 | |
| Algonquin Northeast Gateway LNG | Algonquin Gas Transmission, LLC | MA | 2007 | |
| Algonquin Project Beacon | Algonquin Gas Transmission, LLC | CT, MA, NY, RI | | |
| Algonquin Reliable Affordable Resilient Enhancement Project | Algonquin Gas Transmission, LLC | CT, MA, RI | | |
| Algonquin Tiverton Electric Expansion | | CT, RI | In service 2000 | |