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Central Maine Power Company

Central Maine Power Company (CMP) is an electric utility serving central and southern Maine, founded in 1899 and a subsidiary of AVANGRID, Inc.

Last updated October 24, 2026

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Overview

Central Maine Power Company (CMP) is an electric utility in Maine, United States. Founded on November 7, 1899, by attorney Harvey Eaton and engineer Walter Wyman, it began by purchasing a hydroelectric generator to provide street lighting and electric services to around 100 customers in Oakland, Maine. The company adopted the name Central Maine Power in 1910. Today it is a wholly-owned subsidiary of AVANGRID, Inc., serving more than 670,000 customers across 346 communities in central and southern Maine.

History

Central Maine Power was founded on November 7, 1899, when attorney Harvey Eaton and engineer Walter Wyman partnered to purchase a hydroelectric generator to provide street lighting and other electric services to around 100 customers in Oakland, Maine. The two grew their footprint through the purchase of additional hydroelectric facilities across central Maine, expanding their service area through interconnection and acquisitions. They began using the name Central Maine Power in 1910. In 1918, CMP employed women in roles typically reserved for men well before women had the right to vote in the United States. During World War Two, shipyards like Bath Iron Works required large amounts of electricity to support the war effort. More recent milestones include the historic restoration of power to hundreds of thousands of Mainers following the Ice Storm of 1998 and the joining of CMP into the Iberdrola Group and Avangrid in 2015. Today, Central Maine Power is Maine's largest utility company covering more than 11,000 square miles and delivering electricity to more than 650,000 customers.

Products and positioning

Maine's largest utility company, committed to safe, reliable and affordable power and to supporting Maine's climate and energy goals.

Product categories. electricity delivery · electric service connection and transfer · outage reporting and restoration

Controversies

  • 2021

    Central Maine Power fined $360,000 over testing violation

    Central Maine Power was assessed a $360,000 fine for an apparent transmission-system testing violation. The Federal Energy Regulatory Commission approved the penalty. CMP said it self-reported the incidents, cooperated with the investigation, and updated training on its processes and equipment performance.

  • 2020

    Friends of Merrymeeting Bay sues CMP over tower radar plan

    Friends of Merrymeeting Bay and three individuals filed a lawsuit against Central Maine Power Company over the utility's plan to install a radar system on two transmission towers. The plaintiffs alleged that the plan could have adverse health effects and could harm local wildlife. The suit was reported in July 2020.

  • 2019

    Avangrid agrees to pay $450,000 fine over reliability-standard violations

    Avangrid agreed to pay a $450,000 fine assessed for violations of transmission standards intended to maintain regional grid reliability. The reported incidents involved CMP, New York State Electric and Gas, and Rochester Gas and Electric; the settlement still required Federal Energy Regulatory Commission approval.

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Recent events

  • Central Maine Power appoints Joseph A. Purington as president and CEO[9]

    Reported:

    Central Maine Power appointed Joseph A. Purington as its next president and chief executive. He was expected to officially rejoin the company in about a month.

  • Unconfirmed

    Central Maine Power fined $360,000 over testing violation[7]

    Reported:

    Central Maine Power was assessed a $360,000 fine for an apparent transmission-system testing violation. The Federal Energy Regulatory Commission approved the penalty. CMP said it self-reported the incidents, cooperated with the investigation, and updated training on its processes and equipment performance.

  • CMP launches EV charger incentive pilot[10]

    Reported:

    Central Maine Power launched a pilot incentive program offering up to $4,000 toward installing high-power electric vehicle charging stations in Maine.

  • Friends of Merrymeeting Bay sues CMP over tower radar plan[6]

    Reported:

    Friends of Merrymeeting Bay and three individuals filed suit against Central Maine Power over its plan to install a radar system on two transmission towers, alleging possible adverse health effects and harm to local wildlife.

  • Unconfirmed

    Avangrid agrees to pay $450,000 fine over reliability-standard violations[8]

    Reported:

    Avangrid agreed to pay a $450,000 fine assessed for violations of transmission standards intended to maintain regional grid reliability. The reported incidents involved CMP, New York State Electric and Gas, and Rochester Gas and Electric; the settlement still required Federal Energy Regulatory Commission approval.

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