Solothurn has a unicameral legislature.
The Cantonal Council has 100 seats, with members elected every four years.
In the last election, on 7 March 2009, saw the centre-right maintain its dominance of the Cantonal Council.
The Social Democrats lost ground, falling three seats to 21 overall, whilst the Swiss People's Party gained one seat to 18.
The left-wing Green Party and centre-right Green Liberal Party also gained two seats apiece.