| | | | | | | | |
| Subsidiary Name | State of Origin |
| 1. | Black Hills Colorado Electric, LLC * | Delaware |
| 2. | Black Hills Colorado Gas, Inc. * | Colorado |
| 3. | Black Hills Colorado IPP, LLC * | South Dakota |
| 4. | Black Hills Colorado Wind, LLC | Delaware |
| 5. | Black Hills Electric Generation, LLC * | South Dakota |
| 6. | Black Hills Energy Arkansas, Inc. * | Arkansas |
| 7. | Black Hills Energy Services Company * | Colorado |
| 8. | Black Hills Exploration and Production, Inc. * | Wyoming |
| 9. | Black Hills Gas, Inc. | Delaware |
| 10. | Black Hills Gas, LLC | Delaware |
| 12. | Black Hills Gas Holdings, LLC | Delaware |
| 13. | Black Hills Gas Parent Holdings II, Inc. | Delaware |
| 14. | Black Hills Gas Resources, Inc. * | Colorado |
| 15. | Black Hills/Iowa Gas Utility Company, LLC * | Delaware |
| 16. | Black Hills/Kansas Gas Utility Company, LLC * | Kansas |
| 17. | Black Hills Nebraska Gas, LLC * | Delaware |
| 18. | Black Hills Non-regulated Holdings, LLC | South Dakota |
| 19. | Black Hills Plateau Production, LLC * | Delaware |
| 20. | Black Hills Power, Inc. * | South Dakota |
| 21. | Black Hills Service Company, LLC * | South Dakota |
| 22. | Black Hills Shoshone Pipeline, LLC * | Wyoming |
| 23. | Black Hills Utility Holdings, Inc. * | South Dakota |
| 24. | Black Hills Wyoming, LLC | Wyoming |
| 25. | Black Hills Wyoming Gas, LLC * | Wyoming |
| 26. | Cheyenne Light, Fuel and Power Company * | Wyoming |
| 27. | Mallon Oil Company, Sucursal Costa Rica | Costa Rica |
| 28. | N780BH, LLC | South Dakota |
| 29. | Northern Iowa Windpower, LLC | Delaware |
| 30. | Rocky Mountain Natural Gas LLC * | Colorado |
| 31. | Wyodak Resources Development Corp. * | Delaware |