1.  Constituency At a Glance

Key Sub-Localities

Thiruvottiyur · Kathivakkam · Kattupalli village · Nettukuppam · Tondiarpet (northern fringe) · Athipattu · Manali · Ennore fishing hamlets

2.  Constituency Overview

Thiruvottiyur is Assembly Constituency No. 13 under the Chennai North Lok Sabha zone. It is the northernmost of Chennai’s 16 constituencies, hugging the Bay of Bengal coast from Tondiarpet up through the Ennore creek to Kattupalli. The constituency is defined by its concentration of heavy industry: coal-fired power plants, a 10.5 million tonne per year petroleum refinery, fertiliser plants, and the Ennore and Kattupalli ports. The CPI(M) has been fielded in Thiruvottiyur by the SPA alliance in 2026 — marking a shift from the direct DMK contest of 2021.

3.  2026 Candidates and Party Positions

CPI(M) — SPA Candidate (2026)

Thiruvottiyur has been allocated to the Communist Party of India (Marxist) under the SPA’s 2026 seat-sharing arrangement, with CPI(M) contesting under the DMK’s Rising Sun symbol. This marks a notable shift from 2021, when the DMK contested directly. CPI(M) has a historical voter base among industrial workers and fishing communities in Ennore and Kattupalli. In 2021, the DMK’s Sankar won Thiruvottiyur by a margin of 37,661 votes over the AIADMK’s Kuppan.

AIADMK — Direct Contest (NDA)

The AIADMK contests Thiruvottiyur directly under the NDA banner. In 2021, AIADMK’s Kuppan received 25.26% vote share against DMK’s 44.09%. The party faces the challenge of consolidating the NDA vote in a constituency with strong left-leaning industrial worker demographics.

TVK — Senthilkumar

TVK has confirmed Senthilkumar as its candidate for Thiruvottiyur. The constituency’s large industrial working-class voter base — petrochemical plant workers, port workers, and fishing families in Kattupalli, Kathivakkam, and Ennore — forms TVK’s target demographic. Senthilkumar contests on the Whistle symbol, with TVK’s pollution accountability and livelihood security messaging particularly relevant in the seat most affected by industrial contamination in all of Chennai district.

4.  Election History

Party Win Rate: DMK: 5 wins (56%) | AIADMK: 4 wins (44%) since 1977

5.  Key Local Issues for 2026

Industrial Pollution: Oil Spills, Ammonia Leaks, Ash Dumps

Thiruvottiyur bears the heaviest industrial pollution burden of any Chennai constituency. December 2023 floods brought oil from nearby industrial storage into residential homes along the coast, causing skin conditions. An ammonia gas leak from Coromandel International Limited (CIL) at Ennore caused alarm in early 2024. Two coal-fired power plants and their ash dumps, a 10.5 MTPA petroleum refinery, and several petrochemical units operate within or immediately adjacent to the constituency. Air quality, water contamination, and soil health are chronic concerns for residents of Athipattu, Kathivakkam, and Ennore fishing hamlets.

Kattupalli Port Expansion: Fishers vs Industry

The proposed expansion of Kattupalli Port (currently operated by an Adani Group subsidiary) from 24.65 MTPA to 320 MTPA has drawn sustained resistance from fishing communities in Kattupalli village and surrounding coastal hamlets. Inland fishers link the expansion to deteriorating catches in Ennore Creek and surrounding backwaters. The port’s 2013 inception and its 2018 acquisition by the Adani subsidiary have been contested at multiple levels.

Flood Vulnerability and Coastal Risk

Low-lying coastal settlements in Nettukuppam, Kattupalli village, and the Ennore coastline are acutely vulnerable to sea ingress and storm surge. The combination of industrial activity, reduced mangrove cover, and climate-driven sea level rise has increased flood risk over the past decade. Coastal road maintenance and sea wall conditions are standing civic issues.

CIL Plant Closure Demand

Residents and civic groups have consistently demanded the permanent closure of the Coromandel International Limited fertiliser plant in Ennore, citing ammonia risks and environmental damage. In early 2024, the then North Chennai MP submitted a formal petition to the Union Environment Minister on this issue.

6.  What to Watch in 2026

Thiruvottiyur’s 2026 contest is shaped by the SPA’s decision to field CPI(M) here rather than DMK directly. The party change may affect booth-level mobilisation in one of North Chennai’s most industrially politicised constituencies. The key questions: will CPI(M) retain DMK’s 2021 vote bank, and will industrial worker solidarity outweigh AIADMK and TVK challengers on April 23.

7.  Key Election Dates

How to Check Your Voter Status

• Verify name: voters.eci.gov.in
• Download voter slip: CEO Tamil Nadu — ceotn.gov.in
• Check candidate affidavits after April 6: affidavit.eci.gov.in
• MCC complaints: Call 1950 or use the cVIGIL app