Duke Energy and TreesUpstate have partnered again to offer their Energy Saving Trees program to the public. A free tree giveaway will be held at the World of Energy from 9-11 a.m., Saturday, May 7. Reserve your tree online today (two per household). A select number of trees will be available on a first-come, first-served basis. Pre-registration is recommended. Trees will come in three-gallon containers. Species available include redbud, red maple, pawpaw, persimmon, Eastern red cedar, tulip poplar, blackgum, Shumard oak, swamp white oak, Overcup oak, swamp chestnut oak, Nuttall oak and baldcypress.