The chairman of the utility giant bought 7350 ordinary shares yesterday at a price of £13.51 per share. That took Lord Smith's holding in the Perth business to 29,950 shares.
He joined SSE in 2003 as a non-executive director and has held the chairman post since January 2005.
The 69-year-old is also chairman of the Green Investment Bank and the organising committee of the Glasgow 2014 Commonwealth Games.
SSE's shares closed up 1p, or 0.1%, at 1347p.