The Public Service Enterprise Group, Inc. is a publicly traded diversified energy company headquartered in Newark, New Jersey, US, established in 1985 with a legacy dating back to 1903. The company's largest subsidiary is Public Service Electric and Gas Company. The Public Service Electric and Gas Company is a regulated gas and electric utility company established in 1928 serving the state of New Jersey and it is New Jersey's oldest and largest investor owned utility company; it was originally a subsidiary of the New Jersey–based Public Service Corporation. Wikipedia