Scottish and Southern Energy plc (SSE) is an energy company formed in 1998 following a merger of equals between Scottish Hydro-Electric plc and Southern Electric plc. Its headquarters are located in Perth, Scotland.

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According to their 2006 Corporate Report, SSE is the largest generator of electricity from renewable sources in the UK. In 2004/2005, 7.5% of the electricity it supplied was from renewables compared with the UK average of 3.8%.