Tamil Nadu recorded 30.62 per cent voting till 11am in 38 Lok Sabha constituencies of the state, with Chief Minister K Palaniswami and DMK chief M K Stalin among the early voters.
Chief Electoral Officer Satyabrata Sahoo said polling has been peaceful until now and issues like technical glitches in some locations are being addressed.
"Polling has been very peaceful," he told reporters here.
He said the state has recorded 30.62 per cent voting till 11am, with Arani registering the highest of 36.51 and Central Chennai the minimum of 22.89 per cent.
Giving information about voting for bypolls in 18 assembly segments, he said it ranged between 28 to 30 per cent and added more inputs are being collated.
South Chennai has recorded 23.87 per cent, North Chennai 23.36 per cent and Madurai 25.41 per cent, he added.
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He said soon after the mock polls by around 6am, as many as 305 EVMs and 525 VVPATs were changed spread over 66,167 polling stations across the state over technical issues. Even if voters did not have the voter's slip they could still vote since it was not one of the 12 documents mandated for voting.
The slips were only for the purpose of identifying the elector's polling station and their serial number on poll rolls, he said.
Palaniswami and Stalin waited in queue at Edappadi in Salem district and Chennai, respectively, and cast their votes.
After casting his vote, Stalin alleged that there has been distribution of cash and accused the Election Commission of being an "ally" of central and state governments.
Union minister Pon Radhakrishnan, DMK's Dayanidhi Maran and Kanimozhi, and Karti Chidambaram of Congress are among key contenders.
Radhakrishnan told reporters in Kanyakumari: "This is a massive democratic festival which will decide the fate of India. I have exercised my franchise... A silent revolution is happening."
AIADMK leader and state minister D Jayakumar said 13 per cent voting in the morning "is a joyous thing."
Amma Makkal Munnetra Kazhagam leader TTV Dhinakaran alleged "malfunctioning of EVMs is an achievement of the Modi government."