Diversified energy and utility holding company Black Hills Corp. said Wednesday that CFO Mark Thies resigned for “personal considerations and health” effective Friday. CEO David Emery will fill in as CFO for an interim period. Emery said the Rapid City, SD-based company has retained an executive search firm to assist in identifying a replacement for Thies, who had been with the company 10 years. The company has retail and wholesale utility and merchant energy businesses in South Dakota, Wyoming, Montana and other states.

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