Victorians on the western tip of the Mornington Peninsula will head to the polls today to elect a new Member of Parliament in the Nepean by-election.The by-election was triggered by the resignation of former tennis star Sam Groth, who quit parliament in February.The Liberal party will look to retain the seat this weekend, which it has held for all but one term in the past 40 years.Labor is choosing to not contest the by-election, but the Liberals face a challenge from the Greens, One Nation and five independent candidates.Mr Groth won the seat back from Labor in the 2022 state election by a margin of 6.4 per cent.Figures from the Victorian Electoral Commission (VEC) show a strong turnout for early voting in the by-election.VEC commissioner Sven Bluemmel said that as of Friday afternoon, more than half of the 50,000 residents in the electorate had already voted. "We've seen the trend continue, that people seem to like early voting, and we of course provide every opportunity for people to do that," he said."But this looks like it will be one of the highest early turnouts that we've seen."There are 13 voting centres around the electorate operating from 8am to 6pm, with each listed on the VEC website.Residents over the age of 18 living in Nepean who have not enrolled are also informed they may enrol and vote on the spot at any voting centre.Nepean residents can enrol with one of the following documents:Polling places are still open until 6pm across the electorate for those who have not yet voted. "As long as you're in the queue by 6 o'clock, we will make sure that you're able to cast your vote," Mr Bluemmel said.