SEMCO ENERGY Announces Partial Redemption of 10.25% Trust Preferred Securities

PORT HURON, Mich., March 31 /PRNewswire-FirstCall/ -- SEMCO ENERGY, Inc. (NYSE: SEN) announced today that 400,000 shares of the 10.25% Trust Preferred Securities of SEMCO Capital Trust I will be redeemed on April 29, 2005, at a redemption price of $25.00 per share, for a total principal payment of $10.0 million, plus accrued distributions through the redemption date. A portion of the proceeds from the sale of the recently issued 5.00% Series B Convertible Cumulative Preferred Stock will be used to redeem the securities.

A total of 1.6 million shares of the 10.25% Trust Preferred Securities are currently outstanding. Following the redemption on April 29, 2005, a total of 1.2 million shares of the 10.25% Trust Preferred Securities will be outstanding.

SEMCO ENERGY, Inc. distributes natural gas to approximately 398,000 customers combined in Michigan, as SEMCO ENERGY GAS COMPANY, and in Alaska, as ENSTAR Natural Gas Company. It also owns and operates businesses involved in propane distribution, intrastate pipelines and natural gas storage in various regions of the United States.

The following is a "Safe-Harbor" statement under the Private Securities Litigation Reform Act of 1995. This release contains forward-looking statements that involve risks and uncertainties. Statements that are not historic facts, including statements about the Company's outlook, beliefs, plans, goals and expectations, are forward-looking statements. Factors that may impact forward-looking statements include, but are not limited to, the effects of weather, the economic climate, competition, commodity prices, changing conditions in the capital markets, regulatory approval processes, success in obtaining new business, success in defending claims against the Company, and other risks detailed from time to time in the Company's Securities and Exchange Commission filings.

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    /CONTACT:  Analysts Contact: Thomas Connelly, Director Treasury and
Investor Relations, +1-248-458-6163, or Media Contact: Timothy Lubbers,
Director of Marketing and Corporate Communications, +1-810-887-4208, both of
    /Web site: /

ST:  Michigan

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"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding SEMCO Energy's business which are not historical facts are "forward-looking statements" that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see "Risk Factors" in the Company's Annual Report or Form 10-K for the most recently ended fiscal year.