The energy sector in Tamil Nadu is represented by a mix of large, established groups and mid-sized firms. These companies are primarily involved in power generation, transmission, and distribution, as well as the manufacturing of related equipment and components. The list includes conglomerates with diverse interests, specialized engineering firms, and companies focused on renewable energy.
Notable companies include Murugappa Group, a conglomerate with businesses in engineering and manufacturing; BGR Energy Systems, which provides end-to-end utility industry solutions; Fuji Electric India, a provider of energy and automation solutions; and Siemens Gamesa Renewable Power Private Limited, a manufacturer of wind energy generators. A clear pattern is the strong concentration of headquarters in Chennai, indicating the city's role as a central hub for the energy industry in the region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Murugappa Groupmurugappa.com
Conglomerate with businesses in agriculture, engineering, financial services, manufacturing abrasives, ceramics, electric vehicles, auto components, fertilizers, sugar, tea, and more. |
33,648 | |||
| 2 |
BGR Energy Systemsbgrcorp.com
Provides end-to-end utility industry solutions including product manufacturing and turnkey EPC contracts for complete power plant projects. |
2,145 | |||
| 3 |
EID Parry India Ltdeidparry.com
A company in the sugar industry with interests in nutraceuticals Also involved in farm inputs business through a subsidiary |
1,686 | |||
| 4 |
Voltech Groupvoltechgroup.com
A professional Electrical Engineering firm with extensive experience in Testing and Commissioning of medium and heavy duty electrical systems in power and transmission sector |
1,586 | |||
| 5 |
Fuji Electric Indiaindia.fujielectric.com
Provider of a wide range of energy and automation solutions including UPS, drives, inverters, stabilizers, automation systems, and power semiconductors |
1,555 | |||
| 6 | 1,093 | ||||
| 7 |
NUMERIC INDIA - A Group Brand Legrandnumericups.com
Numeric provides top-notch power back-up solutions with a controlled environmental footprint since 1984, serving various industries with world-class manufacturing and support services |
995 | |||
| 8 |
Operational Energy Group India Ltdoegglobal.com
A global technology company offering comprehensive solutions in Power, Process, and Water industries through engineering, project management, EPC, and operations & maintenance services |
945 | |||
| 9 |
Aban Offshore Limitedabanoffshore.com
Leading Indian offshore drilling contractor offering world-class services for oil exploration and production globally with innovative, cost-effective solutions and a highly qualified team |
894 | |||
| 10 |
Bonfiglioli Indiabonfiglioli.in
Global leader in power transmission industry, specializing in gearboxes, drive systems, solar inverters, and tailored solutions for industrial automation, mobile energy, and wind energy applications |
846 | |||
| 11 |
Siemens Gamesa Renewable Power Private Limitedindiamart.com
Manufacturer of wind energy generators, services, and systems for renewable power generation |
834 | |||
| 12 | 
Chennai Petroleum Corp Limited (CPCL), formerly known as Madras Refineries Limited (MRL)cpcl.co.in
An utilities organization based in Chennai, India, specializing in petroleum refining and related operations |
827 | |||
| 13 |
VESTAS WIND TECHNOLOGY INDIA PRIVATE LIMITED
A utility based in Tamil Nadu, India, specializing in wind technology solutions on Old Mahabalipuram Road in Chennai |
811 | |||
| 14 |
ABI-SHOWATECH (INDIA) PRIVATE LIMITEDabishowatech.co.in
Global leader in automotive component manufacturing, specializing in investment casting and machining of turbo charger and safety critical parts with industry accreditations and NADCAP approved special processes |
703 | |||
| 15 |
ReGen Powertechregenpowertech.com
A leading wind energy company in India, offering turnkey solutions for wind power projects, with a focus on clean, green, sustainable energy production |
658 | |||
| 16 |
TMTL Engines - Eicher Enginestmtl.in
A division of a leading conglomerate in India, TMTL Engines manufactures air and water cooled engines for automotive, stationary, and industrial applications with a focus on power generation |
652 | |||
| 17 |
Fenice Energyfeniceenergy.com
Specializing in clean energy solutions for homes, Fenice Energy offers solar, backup power, and eV charging services with over 20 years of experience |
561 | |||
| 18 |
Toshiba JSW Power Systems Pvt.Ltd.toshiba-tjps.in
A joint venture offering high-quality maintenance services and advanced digital solutions for thermal power plants in India to drive efficiency and reduce environmental impact |
561 | |||
| 19 |
R.K.M. Powergen Pvt. Ltd.
A joint venture company focused on setting up coal-based power projects in Chhattisgarh, with a strong presence in civil contracting and construction |
535 | |||
| 20 |
BANNARI AMMAN SUGARS LTDbannari.com
A food production company based in India, specializing in sugar products and located on Trichy Road in Coimbatore |
520 | |||
| 21 |
ANDRITZ Technologies - Indiaandritz.com
Specializes in providing technologies for various industries including metals, pulp and paper, feed, biofuel, and separation, with operational presence in multiple Indian regions |
520 | |||
| 22 |
Indira Gandhi Centre for Atomic Research (IGCAR)igcar.ernet.in
A research organization located in Kalpakkam, Chennai, India, focusing on atomic research and technological advancements in the field |
511 | |||
| 23 |
Refex Grouprefex.group
A diversified group based in India with interests in chemicals, energy, pharma, medical tech, sustainable mobility, and airport operations, focused on enhancing ESG practices |
472 | |||
| 24 |
Ganges Internationale Pvt. LTD.gangesintl.com
A leading manufacturer of fabricated structures for various industries with a strong global presence and extensive experience in executing solar PV projects |
453 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 25 |
CREW(P)Ltd.crewpl.com
Specializing in Bulk Material Handling systems for Thermal Power Plants & Ports, offering Engineering services, operation & maintenance in multiple states across India |
452 | |||
| 26 |
NISSI Engineering Solution Pvt. Ltd.nissi.co.in
Specializing in electrical engineering, NISSI provides high-quality solutions for power transmission, distribution, and automation, focusing on innovation, reliability, and customer success |
448 | |||
| 27 |
ZF WIND POWER COIMBATORE LIMITED
Manufacturer of machinery in Coimbatore, Tamil Nadu, India specializing in wind power technology and services |
435 | |||
| 28 |
VOLTECH O AND M SERVICES PVT LTDvoltechgroup.com
Professional services in Operation and Maintenance for Oil & Gas, Power, and Industrial sectors, offering total O&M services and project lifecycle support |
404 | |||
| 29 |
NRP Projects Private Limitednrpprojects.in
A leading engineering construction provider in India, specializing in design, engineering, procurement, and project management services for the oil and gas industry |
399 | |||
| 30 |
Nippo (Indo National Ltd)nippo.in
A leading manufacturer and marketer of dry cell batteries, consumer battery products, LED lights, and electrical accessories in India Also distributes razors and blades |
399 | |||
| 31 |
Sepco Shandong Tiejun Electric Power Company Limitedsepco3.com
A subsidiary of Power Construction Corporation of China specializing in various power plant construction services, including thermal, solar, wind, and more |
389 | |||
| 32 |
Lakshmi Electrical Control Systems (LECS)lecsindia.com
Established in 1981, manufacturing control gear, panels, plastic components, and toolroom moulds Committed to producing high-quality products with ISO accreditations |
385 | |||
| 33 |
Everreneweverrenew.com
Everrenew provides project management solutions for wind, solar, and hybrid projects, along with asset management, to help organizations move towards a sustainable future |
384 | |||
| 34 |
Kshema Powerkshemapower.com
A specialized Indian EPC service company in the Renewable energy industry, with expertise in Wind projects and land development for solar projects |
345 | |||
| 35 |
Rajshree Sugars & Chemicals Ltdrajshreesugars.com
A food production company based in India, specializing in sugar and chemicals manufacturing |
345 | |||
| 36 |
Tamilnadu Electricity Boardtangedco.gov.in
A government-owned power generation and distribution company based in Tamil Nadu, India |
341 | |||
| 37 |
SWELECT Energy Systems Ltdswelectes.com
Public listed manufacturer of solar panels and balance systems providing high efficiency mono perc modules and electrical accessories for global power projects. |
337 | |||
| 38 |
IndianOil LNG Private Limitedindianoillng.com
Specializes in building and operating a world-class liquefied natural gas import terminal with a capacity of 5 MMTPA in Chennai, India |
326 | |||
| 39 |
Atandra Energy Private Limitedatandra.in
The company specializes in power and energy management solutions, offering a range of products to measure, protect, conserve energy, and provide service support across India |
317 | |||
| 40 |
OPG POWER GENERATION PRIVATE LIMITEDopgpower.com
A power generation business situated in Chennai, Tamil Nadu, India, specializing in the production and supply of electricity |
311 | |||
| 41 |
INDOCOOL Composites Private Limitedindocool.in
A customer-centric manufacturer of polymer composite products with expertise in FRP composites for wind turbines and various other sectors |
309 | |||
| 42 |
TAG Corporationtagcorporation.net
An India-based company specializing in electrical/electronic manufacturing services |
236 | |||
| 43 |
SHREE ABIRAMI ENGGINEERING WORKSabiramiengg.com
A leading Indian company specializing in re-manufacturing transformers, motors, and generators, with a strong presence in both domestic and international markets |
212 | |||
| 44 |
Leap Green Energy Pvt. Ltd.leapgreenenergy.com
A rapidly expanding renewable energy platform based in India, specializing in various sustainable energy solutions |
199 | |||
| 45 |
Bhartiya Nabhikiya Vidyut Nigam Ltd. ( BHAVINI )bhavini.nic.in
A government company under DAE focused on constructing and operating Fast Breeder Reactors for electricity generation in India |
199 | |||
| 46 |
Cryolorcryolor.com
Specializes in manufacturing high-quality cryogenic storage and distribution equipment, recognized for optimized total cost of ownership. |
199 | |||
| 47 |
Evolve Energy Groupevolveenergygroup.com
A premium provider of solar power and solar water heating solutions, emphasizing quality components for sustainable and renewable energy projects |
181 | |||
| 48 |
AVR Energies - An O&M Companyavrenergies.com
A leading Asset Management Service Provider in India, offering a wide range of services including project management, operation & maintenance, and shutdown services across various industries |
75 | |||
| 49 |
FENFEO AUTOMATION PRIVATE LIMITEDrapidevcharge.com
An innovative enterprise focusing on evolving technology for renewable energy, particularly in creating faster and safer electric vehicle charging stations |
6 | |||
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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
More company lists in Tamil Nadu
- The largest companies in Tamil Nadu 1,609
- Manufacturers in Tamil Nadu 303
- Multinational companies in Tamil Nadu 285
- Education providers in Tamil Nadu 258
- Companies with in-house R&D in Tamil Nadu 226
- Higher Education companies in Tamil Nadu 168
- IT Services and IT Consulting companies in Tamil Nadu 152
- IT services companies in Tamil Nadu 140
- Hardware manufacturers in Tamil Nadu 128
- Retail chains in Tamil Nadu 96
- Automotive manufacturers and suppliers in Tamil Nadu 95
- Education Administration Programs companies in Tamil Nadu 91
- Publicly traded companies in Tamil Nadu 83
- Professional services firms in Tamil Nadu 82
- Financial services firms in Tamil Nadu 77
- Corporate groups and holding companies in Tamil Nadu 77
- Critical infrastructure operators in Tamil Nadu 76
- Companies with a mobile app in Tamil Nadu 75
- Financial Services companies in Tamil Nadu 75
- Healthcare providers in Tamil Nadu 74
- Hospitals and Health Care companies in Tamil Nadu 70
- Motor Vehicle Manufacturing companies in Tamil Nadu 68
- Consulting firms in Tamil Nadu 61
- Software Development companies in Tamil Nadu 58
The same list elsewhere in India
- Energy companies in India 631
- Energy companies in Maharashtra 154
- Energy companies in Gujarat 64
- Energy companies in Haryana 51
- Energy companies in Uttar Pradesh 45
- Energy companies in Karnataka 44
- Energy companies in West Bengal 36
- Energy companies in Rajasthan 25
- Energy companies in Mumbai 92
- Energy companies in New Delhi 72
- Energy companies in Gurugram 44
- Energy companies in Chennai 38
- Energy companies in Bengaluru 35
- Energy companies in Kolkata 34
- Energy companies in Ahmedabad 33
- Energy companies in Pune 31
- Energy companies in Noida 28