                                                                  Exhibit 99.2


                             BLACK HILLS CORPORATION

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Black Hills Corporation (the
"Company") on Form 10-Q for the period ending June 30, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Mark T.
Thies, Senior Vice President and Chief Financial Officer of the Company,
certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the
Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the  requirements  of section 13 (a) or
          15 (d) of the Securities Exchange Act of 1934; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
          material respects, the financial condition and result of operations of
          the Company.


/s/ Mark T. Thies
------------------------------------
Mark T. Thies
Senior Vice President and
Chief Financial Officer
August 14, 2002


