If state regulators sign off on a request from Central Maine Power, a typical Maine household would pay the company around $18 more each month for electricity distribution.
With consumer groups pushing back, the fight over pricing largely turns on one technical question with direct effects on monthly bills: the rate of profit CMP can collect on money it has invested in the power grid.
Here's what to know
CMP has asked the Maine Public Utilities Commission for permission to collect an additional $189 million in revenue, a proposal that translates to an increase of about $18 on the distribution portion of a household's monthly bill. As the Portland Press Herald has reported, a big part of the request stems from CMP's effort to raise what it can earn on infrastructure investments.
In utility regulation, that allowed profit is called "return on equity." It sets the percentage a company may earn on approved grid assets, including poles, substations, and transformers. CMP is currently authorized at a return of 9.35% and wants that figure lifted to 9.8%.
The company also said its rate base — the value assigned to the infrastructure it has built — has risen sharply. According to the Office of the Public Advocate, accepting CMP's updated valuation together with the higher return would produce roughly $61 million in added revenue.
The utility, which serves over 650,000 homes and businesses in central and southern Maine, says it needs the added revenue to pay for storm recovery, support reliability, and fix an aging system.
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"Delaying projects that benefit customers and communities today only increases costs tomorrow," CMP said in a statement, per the local Portland Press Herald.
More background
Opposition to CMP's request has been fierce, with consumer advocates saying a larger profit margin is hard to justify while many Mainers are already squeezed by everyday costs.
"There does have to be some rate of return, and it will always come from ratepayers," Maine Public Advocate Heather Sanborn told the local newspaper. "We have to think about affordability and that Mainers are breaking under the weight of how much costs are going up in every facet of their lives."
Opponents further contend that the company may be asking for a higher return than its finances warrant. Speaking with the local newspaper, Seth Berry, executive director of the grassroots group Our Power, cited a 2025 earnings report from CMP's corporate owner that estimated a 6.26% investor return for its U.S. electric subsidiaries.
"It's more than three percentage points lower [than the rate the company is asking for]," said Berry, whose organization advocates for consumer-owned energy.
The Public Advocate's office said that if the filing is approved as submitted, a typical customer's bill would rise by about $216 a year, including about $70 linked specifically to the higher return on CMP's investments.
What's being done?
A final decision from the Maine Public Utilities Commission isn't expected until next spring. The state regulators are scrutinizing CMP's numbers as part of the decision-making process, and the commission has directed the company to provide records explaining the 6.26% figure raised by critics.
CMP supporters argue that a 9.8% return would remain below the 10% to 11% level they say is common in the industry and that the company needs that return to remain appealing to investors.
No rate change would begin before May 2027, but the commission's decision will determine both the price customers ultimately pay for grid-improvement work and the amount of profit CMP can earn from it.
"So far, the sky hasn't fallen, and I think it's time that we hold the utilities to their own figures when they are in fact required to be accurate," Berry told the Press Herald.
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