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SEMCO ENERGY Announces Public Offering of Common Stock

PORT HURON, Mich., Aug. 3 /PRNewswire-FirstCall/ -- SEMCO ENERGY, Inc. (NYSE: SEN) announced today that it will initiate an offering of 4.3 million shares of common stock to the public under a currently effective shelf registration statement. All of the shares are being sold by the Company. It is currently anticipated that the underwriters will be granted an option to purchase additional shares of the Company's common stock solely to cover any over-allotments.

Credit Suisse First Boston LLC will act as the lead manager for the offering. Natexis Bleichroeder Inc. and A.G. Edwards will act as co-managers for the offering.

A preliminary prospectus supplement relating to the offering will be filed with the Securities and Exchange Commission but remains subject to completion. Copies of the preliminary prospectus supplement and related prospectus may be obtained by contacting Credit Suisse First Boston, Prospectus Department, One Madison Avenue, New York, NY 10010-3629; (telephone: 212-325-2580).

This announcement is neither an offer to sell nor a solicitation of an offer to buy; nor shall there be any sale of these securities in any State in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such State. The offering may be made only by means of a prospectus supplement and related prospectus.

SEMCO ENERGY, Inc. distributes natural gas to approximately 404,000 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.


Analysts Contact: Thomas Connelly, Director Treasury and Investor Relations, 1-248-458-6163
Media Contact: Timothy Lubbers, Director of Marketing and Corporate Communications, 1-810-887-4208
Both of SEMCO ENERGY, Inc.

4972 08/03/2005 16:49 EDT

"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.

©2006 SEMCO ENERGY, Inc., All Rights Reserved.