Our Vision
"To make TANGEDCO synonymous with availability of quality and reliable power at competitive rates."
Tamil Nadu at a Glance
Tamil Nadu lies at the south-eastern end of the Indian peninsula, between latitude 8°5'N and 13°35'N and longitude 76°15'E and 80°20'E. It is bordered by Andhra Pradesh and Karnataka to the north and Kerala to the west. Kanyakumari is the southern tip, where the Bay of Bengal, Arabian Sea and Indian Ocean meet.
Tamil Nadu has a tropical climate with a normal annual rainfall of 911.6 mm. The South West Monsoon runs from June to September and the North East Monsoon from October to December. Plains temperatures range from 20°C to 38°C.
Tamil is the official language. The state is known for its rich cultural heritage, ancient temples with towering gopurams, classical dance and music traditions, and the Thirukkural, dating to before 500 BC. It has an eastern coastline of nearly 1,000 km along the Coromandel Coast.
Tamil Nadu is one of India's most industrialised states with a high Human Development Index. Chennai, the capital, is the gateway of South India. Other major cities include Coimbatore, Madurai, Tiruchirappalli, Salem and Tirunelveli. Key sectors include Electronic Hardware, Automobiles and Components, Textiles & Garments, Leather, and Information Technology.
History of TNEB and TANGEDCO
Before about 1908, electricity generation in Tamil Nadu consisted of a few small tea-estate water-power plants and the Kattery hydro station near Coonoor. The Government Electricity Department was created in 1927.
The Pykara hydro station was commissioned in 1933 with 70 MW capacity, built by Sir John G. Henry Howard. The Tamil Nadu Electricity Board (TNEB) was constituted on 1 July 1957 as the "Madras State Electricity Board", with V.P. Appadurai as Chief Engineer.
The first thermal plant at Ennore was commissioned in 1971 with 60 MW. The Narimanam naphtha gas station with 10 MW was added in 1991-92. Wind energy began with 120 units totalling 19.355 MW between 1986-93. In 1992, the power sector was opened to private participation, with the first IPP being GMR Vasavi at Basin Bridge, Chennai.
Restructuring of TNEB
TNEB was restructured on 1 November 2010 under Section 131 of the Electricity Act 2003, based on G.O. Ms No. 114 dated 08.10.2008, into three entities:
- TNEB Limited — Holding company
- TANGEDCO — Tamil Nadu Generation and Distribution Corporation Limited
- TANTRANSCO — Tamil Nadu Transmission Corporation Limited
All three companies are fully owned by the Government of Tamil Nadu.
Note: In June 2024, TANGEDCO was further trifurcated into TNPGCL (Power Generation), TNPDCL (Power Distribution), and TNGECL (Green Energy).
Generation Capacity
| Source | Installed Capacity |
|---|---|
| TANGEDCO Hydro | 2,307.90 MW |
| Thermal | 4,320 MW |
| Gas Turbine | 516.08 MW |
| Central Generating Stations (Share) | 6,037.50 MW |
| Private Power Projects | 5,551.30 MW |
| Total Conventional | 18,732.78 MW |
Non-Conventional Energy Sources
| Source | Capacity |
|---|---|
| Wind | 7,854.81 MW |
| Solar | 1,702.40 MW |
| Biomass | 230 MW |
| Co-generation | 692.40 MW |
| Total Non-Conventional | 10,479.61 MW |
Distribution Network
TANGEDCO serves over 336.55 lakh consumers across Tamil Nadu through an extensive distribution network comprising 1,949 sub-stations and 4,05,528 distribution transformers. The all-time high peak demand met stands at 20,701 MW.
Generation Performance (2022-23)
| Parameter | Value |
|---|---|
| Thermal Generation | 22,689 MU |
| Hydro Generation | 6,174 MU |
| Gas Turbine Generation | 1,777 MU |
| Peak Demand Met (16.03.2023) | 18,053 MW |
Distribution Statistics (as on 31.03.2023)
| Parameter | Value |
|---|---|
| Total Consumers | 331.16 Lakhs |
| LT Line Length | 6.31 Lakh km |
| Per Capita Consumption | 1,640 Units |
| Distribution Transformers | 3,88,982 |
TNEB's Many Firsts
- Kundah Cascading Hydro Scheme — 5 power houses in the Nilgiris, with Canadian aid, 1957-64
- First Barrage-Type Power Houses — Four of 2x15 MW on the Cauvery between Mettur and Bhavani, 1987-89
- Kadamparai Pumped Storage — 4x100 MW, Coimbatore, 1986
- First 230 kV Gas-Insulated Substation — Mylapore, Chennai, 1998 (Merlin Gerin)
- First 230 kV Line — Kundah to Salem, 173 km, 1960
- First SCADA — Distribution control centre, Chennai
- 100% Village Electrification — First state to achieve this, 1992
- PSC Pole Yard — Samayanallur, near Madurai, 1970
- PLCC Grid Communication — 1960 (Brown Boveri)
Board of Directors
Chairman cum Managing Director
Director / Generation
Director / Distribution
Director / Projects
Director / Finance
Part-Time Directors
- Managing Director / TANTRANSCO
- Principal Secretary, Finance Department, Govt. of Tamil Nadu
- Principal Secretary, Energy Department, Govt. of Tamil Nadu
- Principal Secretary, Industries Department, Govt. of Tamil Nadu
Organizational Structure
TANGEDCO is headed by the Chairman cum Managing Director, supported by:
- Director General of Police / Vigilance
- Joint Managing Director / Finance
- Director Distribution — Overseeing 12 Chief Engineer circles across Tamil Nadu (Chennai North, Kanchipuram, Coimbatore, Erode, Madurai, Tirunelveli, Trichy, Vellore, Villupuram, Thanjavur, Thiruvannamalai, Karur) plus Chief Engineers for Planning, Personnel, Commercial, IT-RAPDRP, and Material Management
- Director Generation — Overseeing thermal, hydro, gas turbine, and non-conventional energy stations
- Director Projects — Managing ongoing and new power projects
- Director Finance — Chief Financial Controller General cum Company Secretary, CFC/Revenue, CFC/Regulatory Cell
- Secretary and Legal Advisor