According to the authority, 992,863 voters cast an early ballot during the first seven days.
"We are seeing a very large increase in early voting so far compared to the 2022 election. The figures for the first seven days show that the trend of more and more people voting early looks set to continue in this year's election," said Anna Nyqvist, head of office at the Election Authority, in a statement.
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The statistics are based on registrations in the digital electoral roll and are preliminary.
Early voting runs up to and including election day on September 13th. In the 2022 election, a total of 3,153,628 people voted early.