(AP Photo/Jim Cole, File) This May 3, 2011 aerial photo shows the Seabrook nuclear power plant in Seabrook, N.H. The impending retirement of Massachusetts' only nuclear power plant could roil energy markets across New England, leading to greater reliance on natural gas, driving up carbon emissions and putting more pressure on pipelines already facing bottlenecks. Pilgrim Nuclear Power Station, the only nuclear power plant in Massachusetts, recently announced it will close by June 2019.