SSE plc produces, generates, distributes, and supplies electricity and gas, as well as other energy-related services in the United Kingdom and Ireland. It operates through three segments: Wholesale, Networks, and Retail. The company generates electricity from gas, oil, coal, water, and wind. Its electricity networks transmit and distribute electricity to approximately 3.7 million businesses, offices, and homes through approximately 130,000 kilometers of overhead lines and underground cables; and gas networks distribute gas to approximately 5.7 million homes, offices, and businesses through 75,000 kilometers of gas mains. The company also supplies electricity and gas to approximately 9 million households and businesses under the SSE, Scottish Hydro, Southern Electric, SWALEC, Atlantic, and Airtricity brands. In addition, it maintains and replaces street and highway lighting; designs, builds, owns, and operates networks for electricity, gas, water, and heat; and provides network capacity, bandwidth, and data center services. Further, the company offers energy-related products and services, including home services, such as gas boiler covers, central heating and wiring maintenance and installation, telephone line rental, and calls and broadband services; and supplying, installing, maintaining, and reading meters in the household, commercial, industrial, and generation sectors. The company was formerly known as Scottish and Southern Energy plc and changed its name to SSE plc in September 2011. SSE plc was incorporated in 1989 and is based in Perth, the United Kingdom.