| Black Hills Electric Coop, Inc | SD | Cooperative | 163.8 | 0.78 |
| Black Hills Power, Inc. | MT | IOU | 142.9 | 1.40 |
| Black River Electric Coop - (MO) | MO | Cooperative | 1463.8 | — |
| Black River Electric Coop, Inc - (SC) | SC | Cooperative | 126.0 | 1.18 |
| Blue Grass Energy Coop Corp | KY | Cooperative | 1233.7 | 2.38 |
| Blue Ridge Elec Member Corp - (NC) | NC | Cooperative | 80.9 | 1.08 |
| Blue Ridge Electric Coop Inc - (SC) | SC | Cooperative | 180.1 | — |
| Blue Ridge Mountain EMC - (GA) | GA | Cooperative | 641.1 | 4.78 |
| Bluebonnet Electric Coop, Inc | TX | Cooperative | 310.3 | 1.66 |
| Board of Water Electric & Communications | IA | Municipal | 42.6 | 0.65 |
| Bolivar Energy Authority | TN | Municipal | 690.0 | 3.29 |
| Boone County Rural EMC | IN | Cooperative | 139.8 | 1.28 |
| Boone Electric Coop | MO | Cooperative | 85.7 | 0.74 |
| Borough of Chambersburg | PA | Municipal | 27.9 | 0.35 |
| Bowie-Cass Electric Coop, Inc | TX | Cooperative | 2130.6 | — |
| Bozrah Light & Power Company | CT | Municipal | 278.3 | 1.63 |
| Bristol Virginia Utilities | VA | Municipal | 43.2 | 0.46 |
| Broad River Electric Coop, Inc | SC | Cooperative | 95.3 | — |
| Brownsville Public Utilities Board | TX | Municipal | 146.7 | 2.06 |
| Brunswick Electric Member Corp | NC | Cooperative | 56.6 | 0.89 |
| Buckeye Rural Elec Coop, Inc | OH | Cooperative | 1712.4 | 3.36 |
| Butler County Rural Elec Coop - (IA) | IA | Cooperative | 71.3 | 0.68 |
| Butler Rural Electric Coop Inc - (OH) | OH | Cooperative | 194.9 | 2.37 |
| Canadian Valley Elec Coop, Inc | OK | Cooperative | 837.6 | 2.25 |
| Caney Fork Electric Coop, Inc | TN | Cooperative | 549.0 | 0.00 |
| Capital Electric Coop, Inc | ND | Cooperative | 59.7 | 0.59 |
| Carroll Electric Coop Corp - (AR) | AR | Cooperative | 371.1 | 2.22 |
| Carroll Electric Member Corp - (GA) | GA | Cooperative | 192.5 | 1.76 |
| Carroll-White REMC | IN | Cooperative | 644.0 | — |
| Carteret-Craven El Member Corp | NC | Cooperative | 180.0 | 1.45 |
| Cass County Elec Coop Inc | ND | Cooperative | 437.1 | 0.83 |
| Cedar Falls Utilities | IA | Municipal | 4.2 | 0.94 |
| Cedarburg Light & Water Comm | WI | Municipal | 4.8 | 0.15 |
| CenterPoint Energy | TX | IOU | 353.8 | 2.14 |
| Central Alabama Electric Coop | AL | Cooperative | 568.5 | — |
| Central Electric Membership Corp. - (NC) | NC | Cooperative | 318.6 | — |
| Central Electric Power Assn - (MS) | MS | Cooperative | 895.3 | 5.53 |
| Central Florida Elec Coop, Inc | FL | Cooperative | 1902.5 | 3.90 |
| Central Georgia El Member Corp | GA | Cooperative | 910.4 | 2.06 |
| Central Hudson Gas & Elec Corp | NY | IOU | 344.8 | 1.50 |
| Central Lincoln People's Ut Dt | OR | Municipal | 211.6 | 1.22 |
| Central Maine Power Co | ME | IOU | 1656.5 | 3.01 |
| Central Missouri Elec Coop Inc | MO | Cooperative | 123.5 | 1.14 |
| Central New Mexico El Coop, Inc | NM | Cooperative | 694.0 | 6.40 |
| Central Rural Electric Cooperative, Inc | OK | Cooperative | 543.9 | 1.67 |
| Central Texas Elec Coop, Inc | TX | Cooperative | 396.0 | 2.09 |
| Central Valley Elec Coop, Inc | NM | Cooperative | 324.7 | 2.53 |
| Central Virginia Electric Coop | VA | Cooperative | 334.0 | 2.82 |
| Cherokee County Elec Coop Assn - (TX) | TX | Cooperative | 1451.1 | 6.92 |
| Cherryland Electric Coop Inc | MI | Cooperative | 108.9 | 0.82 |