New electoral boundaries for South Australia finalised – and one in five voters will be in a new electorate

About 220,000 South Australians will be in new electorates by the next election, after changed boundaries were finalised this week.

One in five South Australian voters will find themselves in a different electorate at the 2022 state election, after new boun­daries were finalised on Wednesday.

The Electoral Districts Boundaries Commission released its final report and maps for the next election.

Subject to any appeal to the Supreme Court, the new boundaries will take effect for the March 19, 2022, election.

An estimated 220,000 voters will be in new electorates.

The new boundaries mean Labor could form government with a uniform swing of 2 per cent across the state.

However, that is based on the assumption that former Labor MP-turned-independent Frances Bedford would return to her old party if it was to form government.

Without Ms Bedford, the member for Florey, Labor would need to take five seats from the Liberals.

SEE ALL THE NEW STATE ELECTORATE MAPS HERE

Labor MP Tom Koutsantonis and former Labor-turned-independent Frances Bedford. Without Ms Bedford, the member for Florey, Labor would need to take five seats from the Liberals to win a 2022 election. Picture: AAP / Brenton Edwards

The four most marginal Liberal-held seats remain Adelaide, Elder in the city’s south and Newland and King in the northeastern suburbs.

Liberal MP Matt Cowdrey’s western-suburbs seat of Colton is the next most vulnerable – on a margin of 6.2 per cent.

Richard Harvey, who won the seat of Newland at the last state election, is now the most vulnerable MP in the state after his margin dropped from 2.1 to 0.2. The changes mean the member for Adelaide and Child Protection Minister Rachel Sanderson falls from a margin of 1.1 to 0.8.

King MP Paula Luethen is also on a margin of 0.8.

The member for Elder, Carolyn Power, who had been touted as a potential minister when Mr Marshall reshuffled his Cabinet earlier in the year, has dropped from 4.5 to 2.0 – a much better outcome for her than the razor-thin margin of 0.1 proposed by the commission in August.

Liberal MP Carolyn Power has been tipped as a potential future minister but Elder remains a marginal seat. Picture: Tricia Watkinson

Labor’s most marginal seat, Mawson, which takes in Kangaroo Island and the Fleurieu Peninsula and is held by Leon Bignell, would become a little harder to lose, going from 0.4 per cent after the last election to 0.8 per cent in the shake-up.

Labor MP Tony Piccolo had planned to jump seats for the next state election, to Schubert, setting up a showdown with former Liberal transport minister Stephan Knoll after a redraw took key communities, including parts of Gawler, from Mr Piccolo’s seat of Light.

But Wednesday’s redraw left many of those communities in Light.

Liberal Party state director Sascha Meldrum said the new boundaries “show the Liberal Party will be able to achieve the same result as the 2018 election”.

Labor state secretary Reggie Martin said the report included “some significant changes that take time to properly digest”.