The utility does not yet have concrete plans for the property that once housed New England’s largest fossil-fuel power plant; Eversource acquired it because of its critical location within the larger electric grid. The company already has a substation complex next door on the site now controlled by the Kraft Group – infrastructure that would remain in place after the soccer facility is built.

“We are seeking to optimize what can be done for economic development with Kraft Group and Wynn while ensuring our customers’ clean energy interests are protected,” said Vandan Divatia, the lead Eversource executive on the deal .

In the next few years, the Mystic 8 and 9 units are expected to be dismantled; They had generated electricity from natural gas fed in from Constellation’s nearby LNG terminal. In the meantime, Eversource will meet with state regulators, local officials and community groups to explore the best ways to reuse the site. It is located in a designated port area where new construction is essentially limited to maritime industrial purposes, such as energy infrastructure. (The state parliament recently removed the stadium property from the DPA.)

Eversource executives hope the property can accommodate new transmission connections — particularly subsea power lines of electricity from hydro, wind, solar or nuclear power plants in other parts of the region.

“In a way, it presents itself as a Swiss Army knife of an energy center,” Divatia said. “It ensures (grid) reliability. It has the potential to connect very different resources.”

Eversource officials said they are paying more for their Mystic land than Wynn was paying for the portion it purchased, in part because the section sold last year needed more environmental cleanup and entailed easements for Eversource’s existing equipment . The company said the transaction “will have no immediate impact on customer bills.”

In 2023, Eversource and National Grid completed $49 million in grid upgrades to bring more power to the congested Boston area ahead of the shutdown of the Mystic power plant. Divatia said these upgrades addressed immediate needs related to the closure of the Mystic plant, but additional work is needed to properly prepare the grid, particularly if Greater Boston’s electricity demand increases in the coming years.

Danielle Burney, spokeswoman for the state Executive Office of Energy and Environment, said the closure of the Mystic Power Plant is an important step forward in the state’s clean energy transition and that Gov. Maura Healey’s administration is pleased to remediate and rehabilitate the site looks forward to working with Eversource and Everett leaders to transform it for the benefit of the community.

Constellation issued a brief statement saying, “It is pleased that Eversource is exploring site uses that support power reliability and the transition to clean energy.” In Massachusetts, Constellation continues to operate the nearby LNG terminal as well as power plants in Medway and Framingham.

News of the sale sparked a much different reaction at Everett City Hall, where Mayor Carlo DeMaria has pushed to transform that part of his city into a dining and entertainment district with the Wynn Casino. DeMaria has already tried to confront someone close to her Battery park Proposal on the grounds that it does not correspond to his vision for this area. DeMaria made similar comments when his office was asked about the Eversource-Constellation deal, saying his findings about it would raise “serious concerns” for the city.

“This appears to continue a pattern of burdening Everett with substandard developments, such as additional battery storage, in a waterfront area with immense potential for higher-quality commercial uses and vibrant recreational spaces for our residents,” DeMaria said in a statement. “For a century, Everett has borne the cost of energy infrastructure at the expense of public health and revenue.”

Jon Chesto can be reached at [email protected]. Follow him @jonchesto.