Southern Electric plc was an electricity company in the UK. It is listed on the London Stock Exchange as SSE (Scottish and Southern Energy PLC.). Southern Electric merged with Scottish Hydro-Electric plc in 1998 forming SSE. Since then SSE bought SWALEC (what was South Wales Electric Company) and Atlantic Electric and Gas. SSE is now the UK's second largest Gas and Electricity supplier with over 9 million customers.
Southern Electric is the predecessor of the Scottish and Southern Energy.