Kodungaiyur incinerator plan faces renewed scrutiny over climate costs

The proposed Kodungaiyur project is a waste-to-energy incinerator designed to burn up to 2,100 tonnes of waste daily and generate electricity. It matters because the technology is being examined not only as waste management, but also as a climate and public health decision. Environmental groups and residents’ associations have criticised the project again after a new study questioned its carbon intensity.

The study, “The Climate Cost of Burning Waste,” examined four operating waste-to-energy plants in Delhi. It estimated that their electricity produced 3.4 kilograms of fossil-origin carbon dioxide per unit of net electricity exported. That figure was about 4.7 times the national grid average cited in the study. A survey near Kodungaiyur’s existing incinerator also found widespread reports of health problems.

The proposed facility is estimated to cost ₹3,500 crore. Residents’ groups and environmental organisations are urging officials to prioritise segregation, reuse, recycling, composting, and biogas instead. The renewed scrutiny means the project faces continuing questions about whether its climate and health costs justify its scale and expense.

A waste-to-energy incinerator is a facility that burns waste and converts the resulting heat into electricity. In broad terms, the heat turns water into steam. The steam drives equipment that generates electrical power. The process also leaves ash and produces gases that require management, though the article focuses on carbon emissions and reported health concerns.

The key mechanism is energy conversion. Waste is fed into a furnace, and combustion releases heat. That heat produces steam, which drives a generator. The relevant climate measure is not simply how much electricity the plant makes. It is the amount of carbon dioxide released for each unit of net electricity exported after the facility’s own needs are accounted for.

The study cited in the article found that four Delhi plants generated electricity with 3.4 kilograms of fossil-origin carbon dioxide per exported unit. This makes the proposed technology controversial. Critics argue that segregation, reuse, recycling, composting, and biogas could manage waste while avoiding incineration’s reported climate burden.

The proposed Kodungaiyur waste-to-energy project is planned to process 2,100 tonnes of waste each day. This is a major expansion in scale compared with the existing incinerator at the same location, which handles 50 tonnes daily. The comparison matters because a larger facility would expose the city to a much bigger version of the same incineration model.

Using the stated capacities, 2,100 tonnes is 42 times 50 tonnes. The proposed project is therefore not a small upgrade. It would greatly increase the amount of waste burned at Kodungaiyur and the electricity-generating infrastructure built around it. The article does not state the existing plant’s cost or electricity output, so those comparisons cannot be made from the available facts.

The proposed project is estimated to cost ₹3,500 crore. Its size and price have become central to the debate because the study questions the climate performance of waste-to-energy plants. Residents’ associations and environmental groups are pressing for other waste-management approaches instead.

Carbon emissions per unit of electricity show how much climate pollution is associated with producing a given amount of power. The measure used in the study was especially specific: it counted fossil-origin carbon dioxide against each unit of net electricity exported. Net electricity means the power left after the plants’ own operations are accounted for.

For four operational waste-to-energy plants in Delhi, the study estimated emissions of 3.4 kilograms of fossil-origin carbon dioxide per unit of net electricity exported. The study’s comparison found this was around 4.7 times the national grid average. In other words, the plants’ electricity carried a much higher reported carbon burden than the average grid electricity benchmark used by the researchers.

This comparison drove criticism of incineration as a climate solution. The article does not provide the grid average’s exact numerical value, but it gives the ratio. Report co-author Anwesha Maharana said climate funding for such facilities would not represent a zero-waste solution.

The survey covered 415 households across eight neighbourhoods within 2 kilometres of Kodungaiyur’s existing 50-tonne incinerator. It found that 79.8% reported one or more health problems. The article does not identify the specific problems or establish that the incinerator caused them. It presents the findings as a major concern raised by residents and campaigners.

The health issue matters because the proposed project would be much larger. Its planned capacity is 2,100 tonnes per day, compared with 50 tonnes for the existing incinerator. Residents and environmental groups therefore fear that expanding the facility could increase concern about the effects of living near an incinerator. Vishvaja Sambhath called incineration a public health question as well as a climate concern.

The survey does not prove a causal link, but it shapes the public debate around the project. The reported health findings, combined with the proposed plant’s scale and cost, give residents’ associations grounds to demand closer scrutiny and consideration of non-incineration options.

The alternatives named in the article focus on handling different kinds of waste separately. Segregation means sorting waste before collection or processing. Reuse keeps usable items in circulation. Recycling recovers materials for new products. Composting treats suitable organic waste, while biogas systems use organic material to produce gas. Together, these approaches reduce the need to burn mixed waste.

Their key mechanism is separation and recovery. Recyclable materials can be kept out of the furnace. Reusable items can be used again. Organic waste can be directed to composting or biogas rather than incineration. This makes the waste stream more useful and supports the approach described by critics as a priority over burning. The article does not quantify how much waste these alternatives could handle.

T.K. Shanmugam said Delhi’s plants show why these options should come first. Geo Damin questioned the promotion of incineration as a solution. The debate now concerns whether Chennai should spend ₹3,500 crore on a large incinerator or give greater priority to these alternative systems.

Carbon intensity is the amount of carbon dioxide associated with producing a unit of electricity. In this article, the measure is fossil-origin carbon dioxide per unit of net electricity exported. Fossil-origin means the carbon came from fossil-based materials, rather than from recently grown biological material. The measure helps compare the climate burden of different electricity sources.

Burning waste releases heat, but the plant must use part of its generated power for its own operations. The study therefore counts emissions against net electricity exported, not all electricity produced. If a facility releases substantial fossil-origin carbon dioxide yet exports limited net power, its emissions per exported unit become high. Mixed waste can contain fossil-based materials, which contribute to this pollution when burned.

The Delhi plants studied were estimated at 3.4 kilograms of fossil-origin carbon dioxide per exported unit, around 4.7 times the cited national grid average. That result led the researchers and critics to question whether incineration should receive climate financing or be treated as a zero-waste solution.