| Continuum Energy Services, LLC | Owner/operator | Tulsa, OK | | 1 |
| Continuum Midstream LLC | Owner/operator | Miami, TX | | 5 |
| Contour Energy E & P Inc | Owner/operator | | | |
| Contura Pennsylvania Land, LLC | Owner/operator | Waynesburg, PA | | |
| Converge Midstream LLC | Owner/operator | Houston, TX | | 1 |
| Cook Inlet Energy, LLC | Owner/operator | Anchorage, AK | | 1 |
| Cook Inlet LNG, LLC | Owner/operator | | 1 | |
| Cook Inlet Natural Gas Storage | Owner/operator | | | 1 |
| Cook Inlet Natural Gas Storage Alaska | Owner/operator | Anchorage, AK | | 1 |
| Cook Inlet Pipe Line Co | Owner/operator | | | |
| Coos County Pipeline Co | Owner/operator | Portland, OR | 1 | 1 |
| Copano | Owner/operator | | 1 | |
| Copano FLD Ser/up Gulf Coast LLC | Owner/operator | | | 16 |
| Copano FLD Serv/south Texas LLC | Owner/operator | | | 11 |
| Copano Field Services Capano Bay, LP | Owner/operator | | | |
| Copano Field Services/copano Bay, L,.p. | Owner/operator | Houston, TX | | 1 |
| Copano Field Services/north Texas, LLC | Owner/operator | Houston, TX | | 2 |
| Copano Field Services/south Texas LLC | Owner/operator | Houston, TX | | 1 |
| Copano Field Services/upper Gulf Coast, L.p. | Owner/operator | Houston, TX | | 1 |
| Copano Gathering System, Inc | Owner/operator | | | |
| Copano NGL Serv (markham), LLC | Owner/operator | | | 9 |
| Copano NGL Services (markham), LLC | Owner/operator | Houston, TX | | 1 |
| Copano NGL Services, L.p. | Owner/operator | Houston, TX | | 5 |
| Copano Pipeline/up Gulf Coast, LP | Owner/operator | | | |
| Copano Pipelines North Texas, L.l.c. | Owner/operator | Houston, TX | | 1 |
| Copano Pipelines/south Texas, L.p. | Owner/operator | Houston, TX | | 24 |
| Copano Pipelines/up Glfcoast LLC | Owner/operator | | | 21 |
| Copano Pipelines/up Gulf Coast, L.p. | Owner/operator | | | |
| Copano Pipelines/upper Gulf Coast LLC | Owner/operator | Houston, TX | | 2 |
| Copano Processing LLC | Owner/operator | Houston, TX | | 6 |
| Copano/webb-Duval Pipeline, LLC | Owner/operator | Houston, TX | | 1 |
| Coral Energy Corp | Owner/operator | | 1 | |
| Coral Mexico Pipeline LLC | Owner/operator | | | |
| Core Appalachia Operating LLC | Owner/operator | Charleston, WV | | 5 |
| Core Services | Contractor | | 1 | |
| Core Solutions LLC | Owner/operator | Salem, WV | | 1 |
| Corlena Oil Company | Owner/operator | | | |
| Corn, LP | Owner/operator | Goldfield, IA | | 1 |
| Cornell University | Owner/operator | Ithaca, NY | | 1 |
| Cornerstone Generation, LLC-Darby Power LLC | Owner/operator | Mount Sterling, OH | | 1 |
| Cornhusker Energy Lexington, L.l.c. | Owner/operator | | | |
| Corning Municipal Utilities | Owner/operator | Corning, IA | | 1 |
| Corning Natural Gas Corp | Owner/operator | Corning, NY | | 1 |
| Coronado Energy E&p Company, LLC | Owner/operator | | | |
| Coronado Midstream LLC | Owner/operator | Dallas, TX | | 6 |
| Coronado Pipeline Company , LLC | Owner/operator | Oklahoma City, OK | | 1 |
| Corpus Christi Liquefaction Stage III, LLC | Owner/operator | | 2 | |
| Corpus Christi Liquefaction Stage III, LLC and Cheniere Corp | Owner/operator | | 2 | |
| Corpus Christi Liquefaction Stage IV, LLC | Owner/operator | | 2 | |
| Corpus Christi Liquefaction, LLC | Owner/operator | Houston, TX | 4 | |