NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the ratings for MDU Resources Group, Inc. [MDU; Issuer Default Rating (IDR) 'BBB+'], its regulated gas distribution subsidiary, Cascade Natural Gas Corporation (Cascade; IDR 'A-'), and Centennial Energy Holdings, Inc. (Centennial; IDR 'BBB'), a holding company for MDU's nonutility operations. The Outlooks for all three issuers is Stable. A full list of ratings follows at the end of this press release. KEY RATING DRIVERS MDU Resources MDU's r
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