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Independent regulatory commissions

SEMCO Energy Gas Company Seeks to Intervene in Great Lakes Gas Transmission Company's Application to Replace Compressor Units

Strategic Insights

— 1 min read

SEMCO Energy Gas Company, a division of SEMCO Energy, Inc., has submitted a motion to intervene in the Federal Energy Regulatory Commission's (FERC) review of Great Lakes Gas Transmission Company's proposal to replace two compressor units at the Naubinway Compressor Station in Mackinac County, Michigan. The replacement units, Solar Mars 100 models, will increase total horsepower from 25,000 to 27,700 HP at an estimated cost of approximately $106 million. As a firm transportation and storage customer on the Great Lakes, SEMCO Energy Gas Company has an interest that may be affected by the outcome of this proceeding, and which cannot be represented by any other party.

Key Takeaways:

  • SEMCO Energy Gas Company is a local distribution company in Michigan, subject to regulation by the Michigan Public Service Commission and exempt from FERC's jurisdiction.
  • Great Lakes Gas Transmission Company proposes to replace two outdated compressor units at the Naubinway Compressor Station with newer and more efficient Solar Mars 100 units.
  • The replacement units will increase total horsepower from 25,000 to 27,700 HP and cost approximately $106 million.
  • SEMCO Energy Gas Company has an interest in the proceeding, as a firm transportation and storage customer on the Great Lakes, and wishes to intervene.
  • The Michigan Public Service Commission will not represent the interests of SEMCO Energy Gas Company in this proceeding.

Statistics:

  • Estimated cost of replacing the compressor units: $106 million.
  • Total horsepower increase: 2,700 HP (from 25,000 to 27,700 HP).
  • Number of compressor units to be replaced: 2.
  • Location of the compressor station: Mackinac County, Michigan.
  • Estimated date of replacement: Not specified in the provided text (October 28, 2025, is the submission date).

Sources:

  • Submission to the Federal Energy Regulatory Commission: Motion to Intervene of SEMCO Energy Gas Company under CP26-3-000 (October 28, 2025, 3:29:19 PM).
  • Great Lakes Gas Transmission Company's 2.55(b) Notification of Natural Gas Facilities Replacement for the Naubinway Compressor Station under CP26-3.

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