Power Generation in Assam: Hydro and Thermal
Electricity is the quiet engine behind every farm, factory and household in Assam, and the state produces it from two main sources. On the one hand there is hydropower, drawn from the fast-flowing rivers of the hills; on the other hand there is thermal power, produced by burning natural gas and coal from the state's own oil and coal fields. Assam's rivers carry an enormous theoretical potential for hydel power, but the state still depends heavily on thermal stations and on its share of central projects. This topic brings together the main power stations, their rivers, districts and capacities, and the agencies that generate and distribute electricity.
The power sector at a glance
Assam's own generation comes from the Assam Power Generation Corporation Limited (APGCL), while electricity is distributed by the Assam Power Distribution Company Limited (APDCL). The total installed capacity from state sources is about 600 to 700 megawatts, and the state receives an additional share from central projects. Assam is connected to the North-East grid of the national power grid, which allows power to be drawn from outside the state when local generation falls short. The main consumers are the domestic sector and the tea industry.
Hydropower in Assam
The largest hydroelectric project of Assam is the Karbi Langpi project, with an installed capacity of about 100 megawatts. It is built on the Karbi Langpi river, a tributary of the Kopili river, in West Karbi Anglong district. The first hydroelectric power station of the state was the Umtru station on the Umtru river, commissioned in 1960. Several rivers of the state have potential for small and micro-hydel projects, notably the Kopili, the Diyung and the Barak. The waters of the hill rivers are thus a major, though still under-used, source of clean power.
Thermal power
The largest thermal power plant of Assam is the Bongaigaon Thermal Power Plant, located at Salakati in Kokrajhar district and the largest power plant of the North-East operated by NTPC. The Namrup Thermal Power Station is at Namrup in Dibrugarh district and runs mainly on natural gas, with an installed capacity of about 226 megawatts. The Chandrapur Thermal Power Project is at Chandrapur in Kamrup district, and coal-based units such as the Margherita thermal plant use coal from the Makum coalfield. The main fuels of thermal power in Assam are therefore natural gas and coal, both produced within the state.
Transmission, distribution and the grid
Power is transmitted and distributed through the state's grid, which is part of the North-East grid of the national system. The North Eastern Electric Power Corporation (NEEPCO) develops major hydroelectric projects in the North-East, including projects in Assam, and the state's main hydropower comes as its share from NEEPCO projects such as Kopili and Khandong. The main problems of the power system are transmission losses, the disruption caused by floods and a shortage of funds for new projects.
Renewable energy and future projects
Assam is now giving more attention to renewable energy. Solar power has growing potential and the state is promoting solar parks and rooftop solar installations, while small hydro projects on the hill streams add further clean capacity. On the Brahmaputra's tributaries, projects such as the proposed schemes on the Dihing river and in the Dehing-Patkai area are under study. Renewable and small-hydro development is important because it can reach remote hill areas where extending the main grid is difficult and costly.
How to prepare this topic
- Learn the largest projects first: Karbi Langpi for hydro and Bongaigaon for thermal.
- Link each station to its river or place: Karbi Langpi on the Karbi Langpi river in West Karbi Anglong, Umtru on the Umtru river, Bongaigaon at Salakati in Kokrajhar, Namrup in Dibrugarh, Chandrapur in Kamrup.
- Remember the two agencies: APGCL generates and APDCL distributes.
- Fix the fuels: Namrup and most thermal units run on natural gas, while Margherita uses Makum coal.
- Note the figures and firsts: Karbi Langpi about 100 MW, Namrup about 226 MW, Umtru the first hydel station in 1960.
Common exam traps
- The largest hydroelectric project is Karbi Langpi, but the first hydroelectric station was Umtru - largest and first are different.
- Bongaigaon is the largest thermal plant of Assam and is located at Salakati in Kokrajhar district, not in Bongaigaon town itself.
- APGCL generates power and APDCL distributes it; the two are often mixed up.
- Namrup's main fuel is natural gas, while Margherita uses coal from the Makum coalfield.
Frequently Asked Questions
Which is the largest hydroelectric project of Assam and where is it?
The largest hydroelectric project of Assam is the Karbi Langpi project in West Karbi Anglong district, with an installed capacity of about 100 megawatts. It is built on the Karbi Langpi river, which is a tributary of the Kopili river. The first hydroelectric station of the state, however, was the Umtru station on the Umtru river, which was commissioned in 1960.
Which is the largest thermal power plant of Assam and what fuel does it use?
The largest thermal power plant of Assam is the Bongaigaon Thermal Power Plant, located at Salakati in Kokrajhar district. It is the largest power plant of the North-East operated by NTPC. The other important station, the Namrup Thermal Power Station in Dibrugarh district, runs mainly on natural gas and has a capacity of about 226 megawatts, while coal-based units such as Margherita use coal from the Makum coalfield.
Which agencies generate and distribute electricity in Assam?
Electricity in Assam is generated by the Assam Power Generation Corporation Limited (APGCL) and distributed by the Assam Power Distribution Company Limited (APDCL). The state also receives a share of power from central projects, and the North Eastern Electric Power Corporation (NEEPCO) develops major hydroelectric projects in the region. The state's grid is connected to the North-East grid of the national power grid.
What is the total installed power capacity of Assam from state sources?
The total installed capacity of Assam from state sources is about 600 to 700 megawatts, to which an additional share from central projects is added. The largest single hydro source within the state is the Karbi Langpi project at about 100 megawatts, and the largest thermal source is the Bongaigaon plant. Assam is connected to the North-East grid, which helps meet demand when local generation is short.
What are the main problems and future prospects of the power sector in Assam?
The main problems are transmission losses, disruption caused by floods and a shortage of funds for new projects. On the future side, Assam is promoting renewable energy, especially solar power through solar parks and rooftop installations, and studying small hydro projects on the hill streams and the proposed schemes on the Dihing river. Renewables are important because they can reach remote hill areas where extending the main grid is difficult and costly.