<P> As of September 2017, there are two new reactors under construction with a gross electrical capacity of 2,500 MW, while 34 reactors have been permanently shut down . The United States is the world's largest producer of commercial nuclear power, and in 2013 generated 33% of the world's nuclear electricity . </P> <P> As of October 2014, the NRC has granted license renewals providing a 20 - year extension to a total of 74 reactors . In early 2014, the NRC prepared to receive the first applications of license renewal beyond 60 years of reactor life, as early as 2017, a process which by law requires public involvement . Licenses for 22 reactors are due to expire before the end of the next decade if no renewals are granted . The Vermont Yankee Nuclear Power Plant was the most recent nuclear power plant to be decommissioned on December 29, 2014 . Another four aging reactors were permanently closed in 2013 before their licenses expired because of high maintenance and repair costs at a time when natural gas prices have fallen: San Onofre 2 and 3 in California, Crystal River 3 in Florida, and Kewaunee in Wisconsin, and New York State is seeking to close Indian Point in Buchanan, 30 miles from New York City . </P> <P> Most reactors began construction by 1974; following the Three Mile Island accident in 1979 and changing economics, many planned projects were canceled . More than 100 orders for nuclear power reactors, many already under construction, were canceled in the 1970s and 1980s, bankrupting some companies . Up until 2013, there had also been no ground - breaking on new nuclear reactors at existing power plants since 1977 . Then in 2012, the NRC approved construction of four new reactors at existing nuclear plants . Construction of the Virgil C. Summer Nuclear Generating Station Units 2 and 3 began on March 9, 2013 but was abandoned on July 31, 2017 . On March 12, 2013 construction began on the Vogtle Electric Generating Plant Units 3 and 4, but has been stalled as the reactor supplier Westinghouse filed for bankruptcy protection on March 29, 2017 . On October 19, 2016 TVA's Unit - 2 reactor at the Watts Bar Nuclear Generating Station became the first US reactor to enter commercial operation since 1996 . </P> <P> There was a revival of interest in nuclear power in the 2000s, with talk of a "nuclear renaissance", supported particularly by the Nuclear Power 2010 Program . A number of applications were made, but facing economic challenges, and later in the wake of the Fukushima Daiichi nuclear disaster, most of these projects have been cancelled, and as of 2012, "nuclear industry officials said in 2012 they expect five new reactors to enter service by 2020--Southern's two Vogtle reactors, two at Summer in South Carolina and one at Watts Bar in Tennessee"; these are all at existing plants . As of August 1, 2017, there are construction delays at Vogtle and construction at Summer has been abandoned . </P>

When was the last nuclear power plant built in the us