| # | Company | Employees |
|---|---|---|
| 1 |
Indian Oil Corp Limitediocl.com
Leading energy company specializing in oil refining, distribution, and marketing, ranked among the world's largest corporations globally. |
41,695 |
| 2 |
NTPC Limitedntpc.co.in
India's largest power generation utility, operating across fossil fuels, hydro, nuclear, and renewable energy sources, with a diversified portfolio including consultancy and training services |
26,494 |
| 3 |
Bharat Heavy Electricals Limitedbhel.com
A leading engineering and manufacturing enterprise specializing in power equipment, serving various sectors globally with a focus on sustainable business solutions and nation building initiatives |
21,861 |
| 4 |
Jindal Steel & Power Ltd.jindalsteel.in
A leading integrated steel manufacturer producing economical steel and power, with a diverse product portfolio, technological leadership, and global recognition for growth |
21,000 |
| 5 |
GMR Groupgmrgroup.in
operates airports, generates energy, develops urban infrastructure, manages transportation, and owns sports teams, all while committing to community development. |
18,287 |
| 6 |
Oil and Natural Gas Corporation Ltdongcindia.com
Largest Indian crude oil, natural gas producer. Integrated energy company with exploration, production, refining, petrochemicals, renewables, and global oil and gas properties. |
16,674 |
| 7 |
GAIL (India) Limitedgailonline.com
Largest natural gas company in India with operations in transmission, marketing, processing, LPG, petrochemicals, city gas, and exploration. |
9,153 |
| 8 |
Vedanta Aluminium Metal Limitedvedantaaluminium.com
India's leading producer of aluminum and value-added products, driving innovation in key industries for a greener future with global technology |
5,522 |
| 9 |
Indian Oil Corporation Limited (Iocl)iocl.com
A state-owned oil and gas company in India with headquarters in New Delhi and a registered office in Mumbai |
4,926 |
| 10 |
DCM Shriram LTDdcmshriram.com
A diversified conglomerate with business interests in agriculture, chemicals, and value-added products, led by a professional executive team |
3,679 |
| 11 |
Oil & Natural Gas Corporation Limited (Ongc)ongcindia.com
Leading Indian company in crude oil and natural gas production, supplying significant portion of domestic market Raw material for downstream petroleum production |
3,382 |
| 12 |
Oil and Natural Gas Corporation Limited (ONGC)ongcindia.com
A leading Indian government-owned oil and gas explorer and producer, responsible for a significant portion of India's domestic production |
3,040 |
| 13 |
BSES Delhibsesdelhi.com
Delhi-based power distribution entities serving over 28 lakh customers in two thirds of the city, with separate coverage areas and customer bases |
2,404 |
| 14 |
Tata Power-DDLtatapower-ddl.com
Delivering electricity and implementing power distribution reforms, including smart metering and solar projects, while empowering underprivileged communities through social initiatives |
2,131 |
| 15 |
Microtek International Pvt Ltd.microtek.in
A technology innovator in the power back-up industry, specializing in reliable and latest technology products for household and industrial consumers globally |
1,935 |
| 16 | 1,911 | |
| 17 |
Sterlite Electricsterliteelectric.com
Global leader in power transmission infrastructure development, offering innovative solutions for energy delivery challenges through talent, technology, and social impact |
1,909 |
| 18 |
HPCL North Zone Allied Retail Businesshindustanpetroleum.com
A Fortune 500 entity in the petroleum industry with a vast retail network offering various commercial activities at its outlets |
1,869 |
| 19 |
UTLupsinverter.com
A leading brand in power back-up and generation, offering a wide range of quality products including UPS, inverters, batteries, and solar solutions |
1,466 |
| 20 |
THINK Gasthink-gas.com
An environmentally conscious company supplying clean fuel through City Gas Distribution in multiple districts across India for various sectors |
1,342 |
| 21 |
Okaya Power Groupokaya.in
A trusted pioneer in battery manufacturing, producing diverse and eco-friendly batteries for various applications like inverters, solar power, and e-rickshaws |
1,208 |
| 22 |
PTC India Limitedptcindia.com
A government-backed initiative focused on promoting power trading, attracting investments in the power sector, and establishing a power market in India and neighboring countries |
1,201 |
| 23 |
ONGC Videsh Ltdongcvidesh.com
Specializing in running exploration and production projects internationally, focusing on operations in the oil and gas industry |
1,073 |
| 24 |
ANDRITZ HYDRO Pvt. Ltd.andritz.com
A subsidiary of a global group, specializing in manufacturing for hydro power projects in India and South East Asia Offers tailor-made solutions |
960 |
| 25 |
Petronet LNG Limitedpetronetlng.in
Leading player in India's energy security drive, importing LNG and setting up terminals with prominent oil and gas industry partners |
851 |
| 26 |
Tata Power Delhi Distribution Limitedtatapower-ddl.com
An utilities company in Delhi, India that focuses on power distribution, specifically providing electricity services to residents and businesses |
831 |
| 27 |
Prakash Industries Limitedprakash.com
A diversified Indian business with operations in Mining, Steel, and Power, manufacturing various Iron & Steel products, supported by captive power plants and a wind farm |
802 |
| 28 |
BSESbsesdelhi.com
A leading electricity distributor in Delhi, supplying power to two-thirds of the capital with a focus on technology, sustainability, and customer satisfaction |
778 |
| 29 | 738 | |
| 30 |
Doosan Power System India Private Limiteddoosanpowersystemsindia.com
Manufacturer of efficient Coal Fired Steam Generators for power plants, executing projects, supplying equipment, and providing renovation and modernization services in India |
724 |
| 31 | 680 | |
| 32 |
DCM Shriram Chemicalsdcmshriramchemicals.com
A leading chemical company creating top quality products for various industries, committed to success through innovation, sustainability, and customer empowerment |
679 |
| 33 |
Hero Future Energiesherofutureenergies.com
A global renewable energy company with 45 GW of assets across multiple countries, focusing on advanced projects and working with hard-to-abate sectors on their net-zero journey |
630 |
| 34 |
Shiv-Vani Oil & Gas Exploration Services Ltd.shiv-vani.com
The company offers onshore and offshore activities, natural gas compression services, and drilling services with a focus on quality, safety, and environmental protection |
562 |
| 35 |
Dhampur Bio Organics Ltd.dhampur.com
A leading sugarcane processing company with a focus on sustainability, producing sugar, renewable power, bio-fuels, and related products |
427 |
| 36 |
MMGmmginda.in
A diversified conglomerate with interests in soft drink manufacturing, oil & gas, hospitality, and real estate, focusing on innovation and customer satisfaction |
118 |
| 37 |
Oorja Development Solutions Limitedoorjasolutions.org
A Farming-as-a-Service company providing solar-powered irrigation, milling, and cooling services to smallholder farmers on a Pay-Per-Use basis in India |
67 |
| 38 |
EVERTAeverta.com
Develops reliable, high-performance DC charging solutions for electric vehicles in India, supporting fleets, businesses, and charge point operators with robust, scalable chargers. |
19 |
| 39 |
HORIZENhorizen.energy
Specializes in infrastructure for producing and distributing high-quality hydrogen fuel to facilitate the adoption of fuel cell electric vehicles in transportation |
15 |
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How this list is built
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 Oct 24, 2026.
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