Black Hills Corp. Schedules Third Quarter 2009 Financial Results Conference Call and Webcast

RAPID CITY, S.D., — Black Hills Corporation (NYSE: BKH) announced today that it will issue a news release regarding 2009 third quarter results on Thursday, Oct. 29, 2009, and host a live conference call and webcast at 11 a.m. ET on Friday, Oct. 30 to discuss financial and operating performance.

To listen to the live broadcast, call 888-423-3268. To access the live webcast and download a copy of the investor presentation, go to the Black Hills web site at www.blackhillscorp.com and click “Webcast” in the “Investor Relations” section. The presentation will be posted on the web site prior to the webcast. Listeners should allow at least five minutes for registering and accessing the presentation. For those unable to listen to the live broadcast, a replay will be available by telephone through Nov. 6, 2009, at 800-475-6701 in the United States and at 320-365-3844 for international callers. Callers need to enter the access code 119392# when prompted. – Black Hills Corporation