Pilgrim Nuclear Power Station (PNPS) is a decommissioned nuclear power plant in Massachusetts in the Manomet section of Plymouth on Cape Cod Bay, south of the tip of Rocky Point and north of Priscilla Beach. Like many similar plants, it was constructed by Bechtel, and was powered by a General Electric BWR 3 boiling water reactor inside of a Mark 1 pressure suppression type containment and generator. With a 690 MW production capacity, it produced about 14% of the electricity generated in Massachusetts. On October 13, 2015, the plant's owners announced that it would close by June 1, 2019, citing "market conditions and increased costs," which would have included tens of millions of dollars of necessary safety upgrades. History Built at a cost of $231 million in 1972 by Boston Edison, the plant was sold in 1999 to the Louisiana-based Entergy Corporation, part of a complex deal that was the result of deregulation of the electrical utility industry. On April 11, 1986, a recurring equipment problem forced an emergency shutdown of the plant. The US Nuclear Regulatory Commission (NRC) called it ″one of the worst-run″ nuclear plants in the country. Pilgrim kept its spent nuclear fuel in an on-site storage pool, waiting for federal direction on the correct disposal process. The Yucca Mountain site in Nevada was being considered for this purpose until its deselection in 2009. Pilgrim's original license to operate would have expired in 2012. In 2006, Entergy filed an application for an extended operating license (until 2032) with the NRC. In May 2012, the NRC approved the 20-year extension, with chairman Gregory Jaczko the lone dissenting vote. Opposition to Pilgrim's license extension came mainly from Pilgrim Watch, a local group which filed numerous legal and procedural challenges. The state attorney general also raised questions about, among other issues, the dangers posed by the onsite storage of spent nuclear fuel. In April 2013, the station increased its security following the Boston Marathon bombing. In July 2013, the plant had to reduce output during a heat wave despite very high electricity demand, because the temperature of water drawn from Cape Cod Bay exceeded 75 °F, the limit set by the NRC. On August 22, 2013, with the plant online at 98% power, two of the plant's main feedwater pumps tripped, causing a drop of the reactor water level. Operators inserted a manual SCRAM to shutdown the reactor prior to