X0508 5 2024-12-31 0 0 0001130464 BLACK HILLS CORP /SD/ BKH 0001693863 Otto Robert P PO BOX 1400 RAPID CITY SD 57709 true false Common Stock 2025-03-01 5 I false 519.9334 A 12951.2482 D Phantom Stock Unit 2025-03-01 5 A false 407.9377 0 A Common Stock 407.9377 9674.8475 I By Trust Shares acquired through the Company's Dividend Reinvestment Plan. 1 for 1 conversion ratio Derivative security is exercisable upon retirement under terms of the agreement. Derivative security expires upon retirement under terms of the agreement. /s/Travis Frederickson 2026-02-04