| Columbia Gas Tacoma Road OPSB case 00-1667-GA-BLN | Columbia Gas | OH | | |
| Columbia Gas Transmission CP06-440 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission CP15-150 | Columbia Gas Transmission, LLC | VA, WV | In service 2017 | |
| Columbia Gas Transmission CP17-5 | Columbia Gas Transmission, LLC | OH | | |
| Columbia Gas Transmission CP25-542 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission CP26-132 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission CP26-139 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission CP26-97 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission CP96-213 | Columbia Gas Transmission, LLC | OH, PA, VA, WV | | |
| Columbia Gas Transmission CP96-800 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission E System Project | Columbia Gas Transmission, LLC | KY | In service 2016 | |
| Columbia Gas Transmission Line 1360 Replacement Project | Columbia Gas Transmission, LLC | PA | Started 2023 | |
| Columbia Gas Transmission Line 1570 Project | Columbia Gas Transmission, LLC | PA | In service 2014 | |
| Columbia Gas Transmission Line 1570 Upgrade Project | Columbia Gas Transmission, LLC | PA | Started 2009 | |
| Columbia Gas Transmission Line 1655 North Replacement Project | Columbia Gas Transmission, LLC | PA | | |
| Columbia Gas Transmission Line A-159 Project | Columbia Gas Transmission, LLC | OH | Started 2022 | |
| Columbia Gas Transmission Line D420 Pipeline Replacement Project | Columbia Gas Transmission, LLC | OH | 2023 | |
| Columbia Gas Transmission Line R300 Replacement Project | Columbia Gas Transmission, LLC | OH | 2023 | |
| Columbia Gas Transmission PF14-11 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission PF15-31 | Columbia Gas Transmission, LLC | | | |
| Columbia Gas Transmission Rock Springs Expansion | Columbia Gas Transmission, LLC | PA | In service 2003 | |
| Columbia Gas Transmission SR538 Pipeline Replacement Project | Columbia Gas Transmission, LLC | OH | Started 2024 | |
| Columbia Gas Transmission, LLC | Columbia Gas Transmission, LLC | WV | | |
| Columbia Gas of Ohio OPSB case 04-1620-GA-BTX | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Ohio OPSB case 04-1621-GA-BTX | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Ohio OPSB case 06-0772-GA-BLN | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Ohio OPSB case 08-1134-GA-BTX | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Ohio OPSB case 12-1173-GA-BLN | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Ohio OPSB case 23-1087-GA-BLN | Columbia Gas of Ohio | OH | | |
| Columbia Gas of Virginia CP23-77 | Columbia Gas Of Virginia Inc | | | |