Environmental Impact Assessment studies are increasingly undertaken before a project is cleared by the Government. Discuss the environmental impacts of coal-fired thermal plants located at coal pitheads.
Subtopic: Environmental Impact Assessment · Thermal power & coal mining
How to structure your answer
Introduction: Define EIA as a pre-clearance appraisal under the EIA Notification, 2006, then set up the pithead plant — a coal-fired station built at the mine mouth to cut transport cost.
Body: Cover three impact clusters — (1) air pollution from combustion, (2) land and water stress from ash and cooling, (3) compounded mining-cum-power burden on local communities.
Conclusion: A balancing line on the energy-security rationale plus a forward look on super-critical units, FGD and ash utilisation.
Written within the word limit
225 words · target 250 words · 11 min
Introduction: An Environmental Impact Assessment (EIA) is the pre-clearance study, mandated by the EIA Notification, 2006, that predicts a project's effect on air, water, land and people. A pithead thermal plant sits right at the coal mine mouth, saving rail haulage but concentrating mining and combustion pollution in one airshed, which is why its impacts deserve close scrutiny.
Body:
- Air pollution: Burning low-grade, high-ash Indian coal emits sulphur dioxide, oxides of nitrogen, particulate matter and trace mercury. In the Singrauli belt these plants drive a large share of regional SO2 and NOx, worsening PM2.5, acid deposition and respiratory disease among nearby populations.
- Land and water: Plants generate huge fly-ash volumes stored in ash ponds; breaches, such as the 2020 Sasan ash-pond failure, bury farmland and leach arsenic and heavy metals into soil and groundwater. Once-through cooling withdraws large volumes from rivers and raises thermal discharge that harms aquatic life.
- Cumulative mining burden: Co-located open-cast mining adds overburden dumps, fugitive dust, land subsidence and forest loss, so a single airshed carries both extraction and combustion stress at once. Displacement, noise and loss of farmland fall heaviest on tribal and rural residents living near the complex.
Conclusion: Pithead siting serves energy security but multiplies local damage, so clearances must enforce super-critical efficiency, flue-gas desulphurisation, 100% fly-ash utilisation and robust ash-pond design rather than treat the appraisal as a mere formality.
What an examiner expects to see
- EIA Notification, 2006 mandates prior environmental clearance with screening, scoping, public consultation and appraisal
- Pithead plants are sited at the mine mouth to cut coal transport cost and rail load
- Indian coal is high-ash, low-sulphur but volume of fly ash is very large
- Key air pollutants: SO2, NOx, particulate matter (PM10/PM2.5), CO and trace mercury
- Fly ash stored in ash ponds; breaches contaminate land and water with arsenic and heavy metals
- Thermal power is a major source of SO2 and NOx emissions in regional airsheds
- Once-through cooling causes high water withdrawal and thermal pollution of rivers
- MoEFCC emission norms (2015) require SO2, NOx and mercury control and flue-gas desulphurisation
- Fly Ash Notification targets 100% ash utilisation in cement, bricks and mine backfill
Concrete cases, schemes and judgments
- Singrauli–Sonbhadra thermal cluster, a notified critically polluted area
- Sasan Ultra Mega Power Project ash-pond breach, 2020
- NTPC Vindhyachal and Rihand pithead super thermal stations
- Korba thermal-cum-mining belt in Chhattisgarh