Tamil Nadu Auto Keeps Growing Inside a Climate Red Zone

CII put Tamil Nadu’s auto plants in a climate red zone, and the state has still stacked more cars, EVs and engines on that same coast. The September 2024 score found very high flood, drought, cyclone and rain risk, and very low ability to cope. Hyundai, Ford and VinFast have kept putting new money into the belt anyway.

The plants that make the headlines sit on higher ground than the parts estates that feed them. When the water comes, it is Ambattur and Padi that go under first.

CII Puts Tamil Nadu Auto in the Red Zone

The Confederation of Indian Industry scored three industrial clusters under a Physical Climate Risk Assessment Framework built with technical help from the Council on Energy, Environment and Water. Automobile in Tamil Nadu was the only one marked red for both hazard and preparedness. Dairy and food processing in Maharashtra, and iron and steel in Odisha, came out with lower risk and more room to adapt.

Forty-four people sat in the consultations, including staff from the Tamil Nadu Small Industries Development Corporation. Hazard, exposure, sensitivity and preparedness were the four inputs. Floods, droughts, cyclones and heavy rain drove the auto result. CII also found a straight link between how close Tamil Nadu’s plants, warehouses and depots sit to the coast and to cyclone-exposed ports, and how hard a storm can hit them.

Two unnamed auto sites in Chennai’s coastal districts, labelled Industry A and B in the full report, carry physical climate risk scores of 0.7 to 0.95. Across Tamil Nadu industry, CII mapped risk in the high band of 0.6 to 0.8 and the very high band of 0.8 to 1. Maharashtra’s sampled sites sat in the low band of 0 to 0.2. Preparedness, plant management, building protection, money set aside for shocks, and technology to handle physical climate risk all scored very low for the auto cluster.

THREE CLUSTERS CII COMPARED

Sanjiv Puri, then CII president and ITC’s chairman and managing director, wrote the framework’s foreword. He said businesses already see capital damage from floods and cyclones, lost output from heat and rain, and parts that cannot move when roads fail.

The framework is designed to help enterprises identify risks from floods, droughts, heatwaves, cyclones, and other phenomena caused by climate change and guide them in prioritizing appropriate adaptation actions across sectors and in different regions.

Sanjiv Puri, President, Confederation of Indian Industry, framework foreword

Findings circulated on 30 September 2024. A Union minister launched the summary at CII’s sustainability summit in November 2024. The full PDF followed in November 2025. The press note that went with the launch asked the government for an open weather dashboard, more adaptation money, and climate-resilient industrial parks.

How Close the Plants Sit to Cyclone Ports

The Chennai auto belt is not a beachfront strip. Sriperumbudur, Oragadam and Irungattukottai sit west of the city in Kancheepuram. Ambattur is on the city’s west side, on lake surplus, not on the Bay of Bengal. CII’s exposure point was still the coast, because finished vehicles and imported parts move through Chennai Port, Kamarajar Port at Ennore, and Kattupalli. A cyclone that shuts those docks, or the roads to them, stops the cluster even if the paint shop stays dry.

Guidance, the state investment agency, says Tamil Nadu builds about 36% of India’s two-wheelers and 25% of its four-wheelers. It also puts the state at about 60% of electric two-wheelers and 40% of tyre output. A State Planning Commission paper on the auto future puts Tamil Nadu at about 35% of India’s auto-component output by value, and about 12% of the state’s manufacturing GDP. Motor vehicles, trailers and semi-trailers are listed as the top manufacturing sector in the 2025-26 policy note.

That is a lot of national output tied to a few ports and a few industrial parks. Hyundai, Renault, Nissan, BMW, Daimler, Royal Enfield and Yamaha already share that western corridor. When CII said distance to the coast predicts damage, it was describing this logistics map, not a row of sheds on Marina Beach.

Four Feet of Water Inside Ambattur

The score was new. The flooding was not. CII’s own report uses the 2015 Chennai floods as the national example of how weather stops factories, citing property losses of INR 14,602 crore that year. The invoice for auto parts landed again in December 2023, nine months before the red-zone note.

THE WEATHER RECORD ON THIS BELT

1. December 2015: Record rain floods Chennai. CII later cites INR 14,602 crore in property losses as one of that year’s costliest disasters in India.
2. December 2023: Cyclone Michaung puts about four feet of water into Ambattur. V. Vijayakumaran, who chairs the Chennai Auto Ancillary Industrial Infrastructure Upgradation Company, puts the tentative hit at about Rs 2,000 crore, with around 1,000 factories affected, about 90% of them auto, and only about half insured. Hyundai and Daimler each halt Sriperumbudur and Oragadam production for two days. Lucas TVS, Wheels India, Sundram Fasteners, Sundaram Clayton and Brakes India stay down for a third day after the Padi substation floods.
3. 24 September 2024: The Ambattur Industrial Estate Manufacturers Association tables a Rs 50 crore flood-proofing plan for the 1,430-acre estate and its 1,800 units, six days before CII’s red-zone note.
4. 1 December 2024: Cyclone Fengal comes ashore. Sriperumbudur records 140 mm of rain. Chennai airport shuts. Chief Minister M.K. Stalin asks the Centre for Rs 2,000 crore from the National Disaster Response Fund. No public tally isolates auto-plant losses from that storm.
5. August 2025: The Water Resources Department moves a Rs 130 crore, five-kilometre channel to send part of Ambattur lake’s surplus into the Cooum, the drain path residents have asked for after years of lake overflow.

Srivats Ram, managing director of Wheels India, said during Michaung that water was still in the Padi substation and inside plants, and that the belt had no power. Vijayakumaran said stormwater capacity in the estate was about 200 cusecs against about 500 cusecs of water. South Phase units came back in stages after power returned on 7 December 2023. A quarter were still recovering in mid-December because water had sat in the machines.

Parts Makers Still Carry the Flood Bill

CII did not tell carmakers to abandon Tamil Nadu. It told them to treat climate like they already treat geopolitics and a supplier’s books. The auto-specific list is short, and it points at the parts chain, not the assembly hall.

WHAT CII ASKED AUTO FIRMS TO DO

• Local EV parts: Widen the buying base and use more nearby suppliers so a washed-out highway cannot stop an electric-vehicle line.

Twice-yearly checks: Score climate risk at raw-material and component vendors every six months, beside the usual quality and money tests.

• Mineral stocks: Work with government on a mineral policy and national strategic mineral reserves, on the model of petroleum reserves.
• Supplier training: One unnamed Tamil Nadu vehicle maker, with knowledge partners, already ran climate workshops for 10 MSMEs in its chain. CII held that up as the model.

Ambattur is where that list meets a lake. About 1,800 units sit on 1,430 acres. The State Planning Commission counts roughly 4,000 small Tier-IV firms around Chennai on top of a few hundred larger suppliers. Heat-treatment shops, machine shops and foundries there feed TVS, Hyundai, Nissan, Honda and the rest. They do not have corporate flood teams. Vijayakumaran’s Michaung count, that only about half the hit units were insured, is the financial version of CII’s “very low” preparedness score.

A fire at Mobis India’s Irungattukottai plant on 31 May 2026 later stalled Hyundai’s Chennai Plant 1 even without rain. That was not a climate event. It was the same single-node problem CII said firms should map twice a year.

Hyundai, Ford and VinFast Still Bet on This Coast

The same week CII’s findings moved, Stalin laid a foundation stone for Tata Motors in Ranipet. Ford, which had stopped building cars in India, signed on for a Chennai powertrain restart: Rs 3,250 crore, and 235,000 engines a year from 2029, aimed at export. VinFast’s EV plant is going up in Thoothukudi, on the southern coast, another cyclone shore. Krishnagiri is being sold as an inland EV hub, which does pull some new work off the Chennai floodplain. The dense corridor CII scored is still the one getting the flagship bets.

THE MONEY THAT LANDED AFTER THE SCORE

• Hyundai EV hub: Hyundai Motor India said in June 2026 it would make Tamil Nadu its flagship EV base in India, with more than Rs 26,000 crore of investment, about Rs 4,000 crore of extra buying from state suppliers, and about 2,000 added jobs. It said it has exported more than 3.9 million vehicles made in Tamil Nadu to more than 150 countries. It also runs a Pune plant, so the group is not only on this coast. The EV work is still being parked here.
• Ford engines: Rs 3,250 crore at the old Chennai site, production due in 2029, 235,000 engines a year for world markets.
• Renault Oragadam: The plant, 240 hectares, has built more than 2.8 million vehicles and 4.6 million powertrains. Renault Group took 100% on 31 July 2025. Headcount was 5,023 on 1 December 2025.

Public talk about Tamil Nadu industry in 2025 and 2026 has followed the investment pitch, not the climate score. Business-environment rankings and EV-hub branding travel farther than a 0.7 to 0.95 risk band. That gap is the story. The red zone did not become a siting veto. It became a PDF sitting next to a bigger order book.

Rainwater Covers 90% of One Plant’s Industrial Need

Some of the large campuses have done the work CII asked for on water, if not on supplier geography. Renault’s Oragadam plant was certified water positive in 2024 and 2025 by DQS against ISO 14046, ISO 46001 and Alliance for Water Stewardship rules. It says rainwater harvesting now meets 90% of industrial water demand, more than 75% of daily water is reused, and an on-site solar plant runs at 2.2 MW. That is one factory buying itself a drought buffer. It does not raise Ambattur’s lake bunds.

The estate’s own Rs 50 crore plan, tabled on 24 September 2024, came from drone surveys and hydrology work after Michaung. Ambattur lake holds 6.1 million cubic metres. The association wanted new channels sized for about 1,659 cusecs of flood release. The state’s Rs 130 crore Cooum channel, announced in August 2025, is the public-works version of the same complaint: the estate floods because surplus water has nowhere useful to go. Neither project is a climate model. Both are drain pipes for a cluster CII had already painted red.

The Cluster Is Larger Than the 2024 Score

CII measured the auto belt as it stood, then the belt added EV lines, a global engine shop, and a second coastal EV bet at Thoothukudi. Adaptive capacity on paper is still the weak leg: low insurance in the parts estates, lake drainage that failed in 2023, and ports that close in a cyclone. A few OEM campuses can harvest rain and run a second plant in Pune. The 1,800 Ambattur units cannot.

The next northeast monsoon will fall on more vehicle, battery and engine capacity than the sites CII labelled Industry A and B. The score has not been withdrawn. The map under it has only grown.