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Stock Trading History of Klefeker Maurice

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Klefeker Maurice since year 2005. The trader's CIK number is 1282192. At the time of this reporting, Klefeker Maurice is the Sr VP Strategic Plan & Dev of Black Hills Corp /sd/ (stock ticker symbol BKH).

Stock purchases, sales, and option exercises reported by *Klefeker Maurice* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-03-14	BKH	Black Hills Corp /sd/	Option Exercise	4,001	28.49	113,975

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Klefeker Maurice (Sr VP Strategic Plan & Dev of Black Hills Corp /sd/ at the time of this reporting) see the Securities and Exchange Commission (SEC) website.