Exhibit 21
BLACK HILLS CORPORATION SUBSIDIARIES
December 31, 2021
| 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 | ||||||
* doing business as Black Hills Energy