 RAPID CITY, S.D., July 06, 2021 GLOBE NEWSWIRE -- Black Hills Corp. NYSE: BKH will announce its 2021 second quarter earnings after the market closes Tuesday, Aug. 3, 2021, and will host a live conference call and webcast at 11 a.m. EDT on Wednesday, Aug. 4, 2021, to discuss the companys financial results. 