0001130464-08-000225 8-K 3 20080711 2.01 9.01 20080717 20080717 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 8-K 34 001-31303 08957564 625 9TH STREET PO BOX 1400 RAPID CITY SD 57709 6057212343 625 9TH STREET PO BOX 1400 RAPID SD 57709 BLACK HILLS HOLDING CORP 20001222 8-K 1 form8k_ipp-final.htm IPP FINAL GRAPHIC 2 ballot.jpg GRAPHIC EX-99 3 ex_99.htm FINANCIAL STATEMENTS