South Carolina Electric & Gas Co. returned Unit 1 at V.C. Summer Nuclear Station to service Saturday after about two months of scheduled maintenance to replace fuel rods.

The Cayce-based subsidiary of SCANA Corp. replaces about one-third of the nuclear reactor's 157 fuel assemblies every 18 months. The refueling outages also allow the power provider to do preventive maintenance work that cannot be done when the reactor is operating.

SCE&G and its partner in the power plant, state-owned utility Santee Cooper, also are building two new nuclear units at the plant in Jenkinsville north of Columbia. They are set to come online in 2017 and 2018.