Cape Town - The Democratic Alliance appeared set to retain the Western Cape after 90% of votes cast had been captured by late Thursday afternoon.
Early indications were that the party was set to increase its support.
The DA had taken just over a million of the votes captured so far - an almost 60% share of the ballots, compared to 51% in 2009.
The African National Congress attracted just under 33% of voters in the province.
It was unclear whether the numbers would change much, with the results from only 119 voting districts still outstanding.
New kids on the block, the Economic Freedom Fighters, caused an upset for other smaller parties, garnering 2% of the Western Cape vote so far.
The African Christian Democratic Party was hovering at just over 1% of the vote, while all other parties, including the Congress of the People and the Freedom Front Plus, had so far failed to reach 1%.
Party representatives were trying to calculate how many of the 42 seats in the Western Cape legislature they would fill.
The IEC said a clearer picture of seat allocation would only emerge later on Thursday night.
Earlier, in the day, IEC provincial electoral officer Courtney Sampson said it was the first time vote-capturing had progressed so speedily.
There was a prediction that voter turnout could have increased this election.
"The assumption that I make is that it could be quite a turnout," he said.
Follow the results LIVE.