But maintaining nuclear-power generation is a key to achieving those goals, according to Talen Energy Corp. spokeswoman Taryne Williams. Allentown-based Talen, which owns the Susquehanna nuclear plant in Luzerne County. Susquehanna would experience a “financial shortfall” in 2020 without a subsidy, according to a state legislative report on nuclear energy released last year. In addition, Three Mile Island nuclear plant outside Harrisburg is set to close in September, and at least one other plant, Beaver Valley in western Pennsylvania, has threatened to shut down without state or federal assistance.