After losing in Nandigram in the Assembly election earlier this year, Ms. Banerjee has returned to contest from her old constituency of Bhabanipur.
Polling began at 7 am on Thursday, September 30, 2021, for the by-election to the Bhabanipur seat, where West Bengal Chief Minister Mamata Banerjee is contesting, and two other constituencies amid tight security and stringent COVID-19 measures, officials said.
A total 6,97,164 voters are eligible to exercise their franchise in the three constituencies.
Votes will be counted on October 3.
Ms. Banerjee, who lost from the Nandigram constituency in the assembly elections earlier this year, has to win this by-poll to retain the Chief Minister's post.
Polls had to be countermanded in Jangipur and Samserganj in April following the death of two candidates.
As part of its elaborate security arrangements, the Election Commission has deployed 72 companies of central forces in the three constituencies, of which 35 are stationed in Bhabanipur alone, the officials said.
Long queues were seen since early morning outside several booths across the constituencies. Voting will continue till 6 pm.
The polling centres have been stocked up with masks and sanitisers as part of the COVID-19 guidelines, the officials said.
Banerjee, who is also the Trinamool Congress supremo, is pitted against BJP’s Priyanka Tibrewal and CPI(M)'s Srijib Biswas in Bhabanipur.