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BOSTON (AP) — The beleaguered Pilgrim Nuclear Power Station, the only nuclear power plant in Massachusetts, will close by June 2019 because it’s becoming too expensive to run, its owner announced Tuesday.

The decision by New Orleans-based Entergy Corp. comes about a month after federal inspectors downgraded the plant’s safety rating to the lowest level and said they would increase oversight in the wake of a shutdown during a winter storm. The owners maintained that the plant in Plymouth remained safe, although it needed millions of dollars in upgrades.

Entergy cited “poor market conditions, reduced revenues and increased operational costs.”

Bill Mohl, president of Entergy Wholesale Commodities, said the decision to close was a “decision of last resort” and “agonizing.”

The 680-megawatt plant, which went online in 1972, was relicensed in 2012 for an additional 20 years. It employs more than 600 people.

The timing of the shutdown depends on several factors, including further discussion with ISO-New England, the operator of the region’s power grid, Entergy said. It could shut down as early the spring of 2017 if it decides not to go through with a scheduled refueling.

Management cited several reasons for the decision, including low current and forecast low wholesale energy prices that are expected to lead to annual losses of more than $40 million in revenue for Pilgrim.

The company also blamed state energy policy, which Mohl said “picks winners and losers.”

“When we look at energy policies in Massachusetts we see a proposed clean energy standard that excludes nuclear, a preference for Canadian hydro power and the subsidization of gas pipeline capacity through electric ratepayers, and put that all together … and it became clear to us that we needed to make the decision to retire Pilgrim,” Mohl said.

The plant will remain under enhanced oversight by the federal Nuclear Regulatory Commission throughout the process, and Entergy expects to spend $45 million to $60 million at the plant during that time, he said.

After shutting down, Pilgrim will transition to decommissioning. The Pilgrim nuclear decommissioning trust had a balance of about $870 million as of Sept. 30, Entergy said, in line with NRC requirements.

Entergy’s decision was met with mixed reaction from groups that have been fighting for decades to have the plant shut down and fiercely fought relicensing.

The state will continue to live in the shadow of a plant that many people consider dangerous, said Arlene Williamson of Cape Downwinders.

“Entergy doesn’t have the financial ability to get Pilgrim out of the dog house, but it will continue to operate for four more years with many safety violations and mechanical failures,” she said.

But Mohl said the plant’s neighbors have no reason worry. He said cutting safety corners “is not an option and not the way we do business.”

“We are absolutely committed to safety,” he said.

Craig Pinkham, acting president of Utility Workers Union of America Local 369, which represents many Pilgrim workers, called on Entergy and the NRC to work together to keep the plant open. The plant, he said, provides 17 percent of the electrical power to Massachusetts.

The spent nuclear fuel at the site will be safely placed in storage onsite and could be there for decades, Mohl said.

Gov. Charlie Baker, who in the past has expressed confidence in the plant’s safety, said his concern now is meeting the electric generation needs of the region.

“Losing Pilgrim as a significant power generator not only poses a potential energy shortage, but also highlights the need for clean, reliable, affordable energy proposals,” the Republican governor said.

U.S. Sen. Edward Markey, D-Mass., also called for a greater commitment to renewable energy.

“Pilgrim Nuclear Power Station is just the latest example of how nuclear power simply cannot compete in the current energy market,” he said, adding: “With this announcement we must also recognize that the time is now in New England and around the nation to rapidly transition toward the safe, affordable clean energy of wind, solar and geothermal power.”

“Entergy’s shutdown announcement was not surprising given their unwillingness to deal with current safety standards,” said U.S. Rep. William Keating, D-Mass., whose district includes Plymouth.

Marvin Fertel, president of the Washington-based industry group Nuclear Energy Institute, warned of the long-term implications of taking the plant offline.

“Electricity consumers in New England will not immediately feel or see the impact of today’s announcement concerning Pilgrim, but they and policymakers at the state and federal levels should not take false comfort in that,” he said. “There will be impacts to offset the loss of this around-the-clock source of carbon-free electricity.”