Exhibit 99.1


                                BLACK HILLS POWER

                            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 Power (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, Daniel P. Landguth,
Chairman of the Board and Chief Executive 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/ Daniel P. Landguth
- --------------------------------------------
Daniel P. Landguth
Chairman of the Board and
Chief Executive Officer
August 14, 2002