The company that owns New Jersey’s three nuclear power plants said Wednesday it will seek federal approval to operate them for another 20 years. The move comes as New Jersey makes a strong push to become the East Coast leader in offshore wind. But the three power plants run by PSEG Nuclear LLC provide nearly half of New Jersey’s electricity, and a licensing extension represents a potential hedge against not enough wind projects being available to meet the state’s needs. An extension would enable the plants to run beyond 2050. The company said it has notified the U.S. Nuclear Regulatory Commiss…