| 24 | Member Electric Cooperatives |
East River Electric's headquarters are located in Madison, SD. |
| 1 | Member Municipal Utility | |
| 92,000 | Retail Accounts Served | |
| 36,000 | Square Mile Service Area | |
| 230 | Power Supply Substations | |
| 203 | Distribution Substations | |
| 2700 | Miles of Transmission Lines | |
| 23 | Wheeling Customers | |
| 122 | Employees | |
| 3.1 | million MWH Energy Sales 2009 | |
| 577 | MW Winter Peak in January 2010 | |
| 408 | MW Summer Peak July 2007 | |
| $223 | million Total Utility Plant 2009 | |
| $131 | million Operating Revenues 2009 |