Labor is on track to win 17 new seats in the WA election, giving it a landslide victory over the Barnett government, an exit poll is showing.
The Channel Nine/Galaxay poll taken of voters as they left the ballot polls has the swing at 11.8 per cent - bigger than the 10 per cent Mark McGowan's Labor needs to win.
Pauline Hanson's One Nation primary vote has slumped to six per cent, down from the nine it averaged during the campaign.
To form a majority government, Labor will need at least 30 of the parliament's 59 seats.
It currently has 21 while the Liberal party has 30 seats. The exit polls show it could have as many as 38 seats.
The results were released on Nine an hour before the voting closed.
Labor will pick up 54.5 per cent of the vote on a two-party preferred basis, while the Liberals will have just 45.5 per cent.
On primary votes, the ALP is on 41 up 7.9 per cent from the 2013 election, while the Liberal party has slumped 14.1 per cent to 33.
The ReachTEL and Newspoll published on Saturday morning had Labor ahead 54-46 on two party preferred basis.
Labor had needed a swing of at least 10 per cent to pick up an extra 10 seats to form government for the first time since 2008.
On the Nine/Galaxy poll, it looks unlikely that One Nation will pick up any seats despite a high profile assault on the electorate.
Pauline Hanson had predicted they'd get five - two in the lower house and three in the upper house.
