Eversource remains Connecticut's largest electric utility, serving more than 1.2 million residential, municipal, commercial and industrial customers in approximately 149 cities and towns.

Eversource is also New Hampshire's largest electric utility, serving over 500,000 customers, including homes and businesses, in 211 cities and towns throughout the state.

[13] Legislation passed in the late 1990s deregulated the electricity market in New England and required regulated utilities to divest generating stations to competitive suppliers.

The city's municipal gas and electric department assumed responsibility for the generators and absorbed the HWP distribution customer base.

[14] Between 2000 and 2002 due to state laws, NU divested WMECO, CL&P, and PSNH's nuclear generating assets which consisted of their stakes in the Seabrook, Millstone, and Vermont Yankee stations.

The Northeast Generation assets, including Mount Tom Station and Northfield Mountain, were all sold to Energy Capital Partners.

PSNH continued to operate regulated hydroelectric and fossil fuel generation assets to serve its default/basic service customers who did not choose an alternative competitive supplier.

Finally, the project allowed a problematic underground 115 kV transmission path through the city of Springfield that was vulnerable to thermal overloads to be removed from service by breaking it in half at the middle.

Starting in 2018, the company began spending $45 million over five years to install over 400 electric vehicle charging stations in Massachusetts.

[25] In November 2015, the Sierra Club of New Hampshire also expressed opposition for the new line, saying that it would not only benefit Connecticut and Massachusetts residents more than those in New Hampshire, but also the concern of the flooding of boreal forests during the construction of Hydro-Québec's dams in northern Quebec, disputes with the Innu First Nations, and the effects of tourism and the environment within the White Mountain National Forest.

[26] On January 25, 2018, Massachusetts Governor Baker selected this "Northern Pass Transmission" (NPT) project[27] as the winner for a clean energy procurement RFP.

On July 26, 2019, Eversource Energy announced that it was giving up Northern Pass after the New Hampshire Supreme Court rejected its appeal and sided with the SEC.

[37] In Massachusetts, Attorney General Maura Healey testified in March, 2017 before the DPU urging it to deny Eversource's proposed $300 million rate increase.

[40] On January 30, 2018, Massachusetts Rep. Thomas Golden and Sen. Michael Barrett held an Oversight Hearing on the DPU's decision to approve Eversource's proposal to include a demand charge as part of a monthly minimum reliability contribution on net metering customers.

[41] In 2017, an environmental group accused Eversource and Avangrid of driving up electric, gas rates over several winters[42] by buying up shipment capacity on a major pipeline that they ultimately did not use.

Those orders had the effect of driving up wholesale prices for natural gas during peak winter heating periods and in turn increasing the costs of electricity generated by gas-fired power plants.

The two utilities “engaged in behavior that would tend to have the largest impact on prices,” said N. Jonathan Peress, a senior director at the New York-based environmental group.

On Feb. 27, 2018, FERC announced their investigation “revealed no evidence of anticompetitive withholding of natural gas pipeline capacity on Algonquin Gas Transmission by New England shippers.” It said that following an extensive review Commission staff “determined that EDF’s study was flawed and led to incorrect conclusions about the alleged withholding.”[44] A class-action lawsuit[45] filed on November 14, 2017, against Avangrid, Inc. and Eversource Energy claims the two companies caused electricity consumers to incur overcharges of $3.6 billion in a years-long scheme that impacted six states and affected 14.7 million people.