0001130464-09-000161 10-Q 7 20090331 20090511 20090508 BLACK HILLS CORP /SD/ 0001130464 4911 460458824 SD 1231 10-Q 34 001-31303 09812120 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 10-Q 1 form10q_1stqtr-2009.htm BHC FORM 10Q 1ST QTR 2009 EX-10 2 ex_10.htm ENSERCO CREDIT AGREEMENT EX-12 3 ex_12.htm COMPUTATION OF RATIOS EX-31.1 4 ex_31-1.htm CEO CERTIFICATION EX-31.2 5 ex_31-2.htm CFO CERTIFICATION EX-32.1 6 ex_32-1.htm CEO SECTION 1350 CERTIFICATION EX-32.2 7 ex_32-2.htm CFO SECTION 1350 CERTIFICATION