It is owned and operated by Southwestern Public Service Company , a subsidiary of Xcel Energy .
Plant X is a steam - electric power plant located in the partially vegetated sandhills south of the West Texas town of Earth in Lamb County , Texas .
Plant X is owned and operated by Southwestern Public Service Company , a subsidiary of Xcel Energy .
Plant X is a steam - electric power plant located in the partially vegetated sandhills south of the West Texas town of Earth in Lamb County , Texas .