Sterlite Copper
An Indian copper-smelting and refining business associated with Vedanta, best known for its Thoothukudi operations and the long-running environmental dispute surrounding that facility.
Last updated August 31, 2026
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Overview
Sterlite Copper is the copper business and operating brand associated with Vedanta's Indian metals operations. Its best-known asset was a large integrated copper smelter and refinery at Thoothukudi, also known as Tuticorin, in Tamil Nadu. The complex produced copper cathodes and copper rod, while associated facilities produced sulfuric acid and phosphoric acid. The business also operated copper-refining and rod-making facilities at Silvassa in the Union Territory of Dadra and Nagar Haveli and Daman and Diu. The Thoothukudi project followed a difficult development path. A proposed facility in Maharashtra encountered strong local opposition in the early 1990s, after which the project was relocated to Tamil Nadu. The smelter began operations in the late 1990s and became one of India's largest copper-producing facilities. Its scale made it strategically important to domestic metal supply, but it also made the site a focus of persistent environmental and regulatory criticism. Residents and campaigners alleged air, water and soil pollution and linked the plant to health concerns. Regulators and courts recorded disputes involving operating permissions, pollution controls and consent renewals. The facility was periodically closed or ordered to stop operations. In 2010, the Madras High Court directed closure for environmental and regulatory reasons. The Supreme Court later overturned that order in 2013 but imposed a substantial environmental penalty. A further closure order followed a 2013 gas-leak incident. Opposition intensified in 2018 when the company sought to expand the smelting complex. Protests in May 2018 culminated in police firing during the Thoothukudi violence, in which 14 people were killed and many others were injured. The Tamil Nadu government ordered permanent closure of the plant on 28 May 2018. The closure became a major issue in India's copper market. It reduced domestic refined-copper production, affected employees and downstream businesses, and contributed to India becoming a net importer of refined copper from 2018–19. Vedanta has continued to contest the closure and has denied wrongdoing. The National Green Tribunal set aside the state closure decision in December 2018, but the Supreme Court overturned that direction in February 2019, holding that the tribunal lacked jurisdiction over the matter while leaving routes through the Madras High Court open. The Thoothukudi smelter has not resumed normal production according to the referenced material. During the COVID-19 crisis, the Tamil Nadu government gave the closed facility temporary permission in 2021 to produce medical oxygen. The company reported supplying liquid and gaseous oxygen to hospitals and contributing to the state's relief fund. Sterlite Copper has also promoted community programs involving drinking water, vocational training, girls' education, scholarships and proposed social infrastructure. These initiatives have operated alongside continuing public controversy over the plant's environmental record and future. Sterlite Copper should therefore be understood both as a major Indian copper-processing brand and as the name most closely identified with the Thoothukudi smelter dispute. Its corporate history is linked to the evolution of Sterlite Industries and later Vedanta-related restructuring, while its current operational status is uncertain because the principal Thoothukudi facility has remained closed since 2018.
History
Sterlite Copper's corporate lineage is connected to the company that became Sterlite Industries. The enterprise was incorporated as Rainbow Investments in 1975, renamed Sterlite Cables in 1976 and later renamed Sterlite Industries in 1986. A restructuring in July 2000 left the company focused on metal activities, including copper and aluminium. Sterlite later became part of the corporate structure associated with Vedanta and its related metals businesses. The copper project initially encountered opposition outside Tamil Nadu. A proposed industrial site in Maharashtra's Ratnagiri district was allocated in the early 1990s, but residents protested and damaged construction-related structures in December 1993. The project was subsequently relocated to Thoothukudi in Tamil Nadu. Gujarat, Goa and Maharashtra had reportedly declined permission for a large smelter before the company obtained approval to develop the Tamil Nadu facility. A refinery at Silvassa was completed in February 1996, with a smelter commissioned later that year. The Thoothukudi smelter began operations in the late 1990s and operated until production was halted in March 2018. The integrated complex included a copper smelter, refinery, copper-rod production, sulfuric-acid facilities and a phosphoric-acid plant. It became India's largest copper smelting operation and an important source of refined copper for domestic industrial users. The business's expansion took place alongside broader Sterlite corporate acquisitions. These included Madras Aluminium Company in 1994, Copper Mines of Tasmania in 1999 and the Lisheen zinc mine in Ireland in 2011. Sterlite Industries was listed on the New York Stock Exchange in 2007. In 2013, Sesa Goa, Sterlite Industries and Vedanta Aluminium were merged into Sesa Sterlite Limited, later known as Vedanta Limited. These transactions provide the wider corporate context for Sterlite Copper, although the Thoothukudi brand remained associated with copper processing. Environmental conflict became central to the plant's history. Local residents and activists repeatedly alleged that emissions and effluents harmed air, water and soil and contributed to health problems. Investigations and regulatory proceedings referred to pollution-control breaches and consent issues. In 2010 the Madras High Court ordered closure, but the Supreme Court reversed that order in April 2013 while imposing a ₹100 crore environmental penalty. The Tamil Nadu Pollution Control Board issued another closure order in March 2013 after a reported gas leak. The company consistently denied the allegations of wrongdoing. In 2018, opposition intensified over plans for a second smelting complex. A large protest movement developed in March and April, and on 22 May police firing during the Thoothukudi violence killed 14 people and injured others. The state government imposed restrictions on public assembly and ordered permanent closure on 28 May 2018. The National Green Tribunal later set aside the closure decision in December 2018 and directed fresh regulatory consideration. In February 2019, the Supreme Court overturned that direction on jurisdictional grounds, leaving further legal avenues in the Madras High Court. The plant has remained shut according to the referenced material. The closure had economic and industrial consequences. It affected direct employment, downstream users and chemical-linked businesses, while India's refined-copper output fell sharply after the shutdown. In 2021, the state granted temporary permission for medical-oxygen production during the COVID-19 emergency. Sterlite reported supplying more than 542 metric tonnes of liquid medical oxygen and gaseous oxygen in cylinders. The company has also publicized water distribution, vocational training, girls' education, scholarships and proposed social-infrastructure programs in the Thoothukudi region. These activities have not resolved the fundamental dispute over environmental compliance, local consent and whether the smelter should reopen.
- 2021
Temporary medical-oxygen production
[1]The closed facility received special permission to produce medical oxygen during the COVID-19 emergency.
- 2018
Thoothukudi plant permanently closed by Tamil Nadu
[1]Following deadly protests, the state government ordered permanent closure of the smelter on 28 May.
- 2013
Supreme Court reverses closure order
[1]The Supreme Court overturned the High Court closure order but imposed an environmental penalty.
- 2010
High Court orders plant closure
[1]The Madras High Court ordered closure over environmental and regulatory concerns.
- 1998
Thoothukudi smelter becomes operational
[1]The large integrated copper smelter at Thoothukudi operated from the late 1990s.
- 1996
Silvassa refinery and smelting operations developed
[1]The Silvassa refinery was completed and the associated smelter was commissioned during 1996.
- 1986
Renamed Sterlite Industries
[1]The business adopted the Sterlite Industries name.
- 1976
Renamed Sterlite Cables
[1]The company changed its name to Sterlite Cables.
- 1975
Enterprise incorporated as Rainbow Investments
[1]The corporate predecessor was incorporated under the name Rainbow Investments.
Products and positioning
A large Indian copper-processing business supplying refined copper and related industrial chemicals, with its public identity strongly shaped by the Thoothukudi environmental and regulatory dispute.
Refined copper
Copper cathodes
Copper cathodes were the principal refined-metal output of the Thoothukudi integrated smelting and refining complex. They serve as feedstock for downstream copper products and industrial manufacturing.
Copper semifinished products
Copper rod
Sterlite Copper operated copper-rod plants, including facilities at Silvassa. Rod is a major intermediate product used by wire, cable and electrical-component manufacturers.
Industrial chemicals
Sulfuric acid
Sulfuric acid was produced as an associated chemical output of the copper-smelting process at Thoothukudi and supplied for industrial applications.
Industrial chemicals
Phosphoric acid
The Thoothukudi complex also included a phosphoric-acid plant, making the operation more integrated than a standalone copper smelter.
Controversies
2018
Thoothukudi environmental dispute and deadly protests
Long-running allegations over pollution and environmental compliance culminated in mass protests against the plant and proposed expansion. Police firing on 22 May killed 14 people and led to permanent state-ordered closure.
2001
SEBI share-price manipulation finding
SEBI found Sterlite Industries, BPL and Videocon guilty of collusion with Harshad Mehta and brokers in an alleged effort to corner shares and manipulate prices. The company was barred from accessing capital markets for two years.
Marketing campaigns
- 2021COVID-19 medical oxygen response
Tamil Nadu · India
After receiving special state permission, the company used the closed Thoothukudi facility to produce oxygen for medical use.
Outcome. The company reported dispatching more than 542 metric tonnes of liquid oxygen and supplying gaseous oxygen in cylinders.
- 2019Muthucharam–Tamira Surabhi Project
Thoothukudi district
Sterlite Copper reported supplying reverse-osmosis purified water to families in villages during a local water crisis.
Outcome. The company reported water distribution to approximately 1,400 families across 12 villages.
Brand decisions
2021
Temporary authorization for medical-oxygen productionOtherBackground
India faced acute oxygen shortages during the COVID-19 pandemic while the Thoothukudi plant remained closed.
Action taken
The Tamil Nadu government granted special permission for oxygen production at the facility.
Aftermath
Sterlite reported supplying liquid and gaseous oxygen to medical facilities and contributing to the state relief fund.
2018
State orders permanent closure of Thoothukudi smelterStrategyBackground
The decision followed renewed opposition to the facility and proposed expansion, along with deadly protests and continuing environmental allegations.
Action taken
Tamil Nadu directed that the Sterlite Copper plant be permanently closed on 28 May 2018.
Aftermath
The National Green Tribunal later challenged the closure decision, but the Supreme Court overturned that direction on jurisdictional grounds. Normal production did not resume in the referenced material.
Sources1 sources
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