What Happened
- The Expert Appraisal Committee (EAC) under the Ministry of Environment, Forest and Climate Change (MoEFCC) granted an 11-year extension of Environmental Clearance (EC) to the 1,750 MW Demwe Lower Hydroelectric Project on the Lohit River in Arunachal Pradesh
- The extension was granted in January 2026, allowing the project's clearance to remain valid until 2037
- The extension was justified on the basis of "zero period" — a legal doctrine that excludes time lost due to litigation from the validity period of an environmental clearance
- The project had been embroiled in litigation before the National Green Tribunal (NGT) since 2017, when the NGT suspended its wildlife clearance citing procedural deficiencies
Static Topic Bridges
Environmental Clearance Process and EAC Under the EIA Notification, 2006
Environmental clearance in India is governed by the Environment Impact Assessment (EIA) Notification, 2006, issued under Section 3 of the Environment (Protection) Act, 1986. Large infrastructure projects (Category A) require clearance from the central MoEFCC, while smaller projects (Category B) are cleared at the state level by the State Environment Impact Assessment Authority (SEIAA).
- The Expert Appraisal Committee (EAC) is a technical body that appraises Category A projects and recommends clearance conditions to MoEFCC
- EC is typically valid for 5-7 years for river valley and hydroelectric projects; extensions are granted in exceptional circumstances
- The "zero period" doctrine: time during which a project cannot proceed due to court-ordered stay or litigation is excluded from EC validity — preventing developers from losing clearances through no fault of their own
- The EIA notification requires public hearing, submission of EIA report, and compliance with conditions post-clearance
- Demwe Lower falls under Category A (>25 MW, river valley project) requiring central clearance
Connection to this news: The 11-year extension using the zero period doctrine reflects the contested legal landscape of large hydropower projects and raises questions about accountability for ecological harm during prolonged approvals.
National Green Tribunal (NGT) and Wildlife Clearances
The National Green Tribunal Act, 2010 established the NGT as a specialized judicial body for fast-track adjudication of environmental disputes. The NGT has jurisdiction over "substantial questions relating to environment" under the Environment (Protection) Act, 1986, the Forest (Conservation) Act, 1980, and the Wildlife (Protection) Act, 1972 among others.
- NGT Act, 2010: Section 14 grants NGT jurisdiction over environmental disputes; Section 16 enables appeals against environmental clearances
- In 2017, NGT set aside Demwe Lower's wildlife clearance, directing the National Board for Wildlife (NBWL) to reconsider
- NBWL is chaired by the Prime Minister and is the apex body under the Wildlife (Protection) Act, 1972 for approving projects within protected areas and eco-sensitive zones
- The NGT can suspend, modify, or cancel environmental clearances — its orders are binding and appeal lies before the Supreme Court
- Wildlife clearance under Section 29 of the Wildlife (Protection) Act, 1972 is mandatory for projects affecting protected areas
Connection to this news: The decade-long NGT litigation that delayed Demwe Lower is precisely why the zero period extension was needed — but it also shows how wildlife clearances remain a key battleground for large infrastructure projects.
Lohit River Basin and Ecological Sensitivity
The Lohit is a major tributary of the Brahmaputra, originating in Tibet and flowing through Arunachal Pradesh before joining the Brahmaputra in Assam. The river basin is ecologically rich and tectonically active.
- Demwe Lower project location: On River Lohit, upstream of Parasuram Kund (a Hindu pilgrimage site)
- Dam height: 162.12 metres; Installed capacity: 1,750 MW
- Forest diversion: 1,416 hectares; Reservoir submergence: 1,589.97 hectares
- Proximity to Kamlang Tiger Reserve — risks fragmentation of wildlife corridors
- The Lohit basin hosts river dolphins and is part of the Eastern Himalayan Biodiversity Hotspot
- Large dams in tectonically active northeastern India raise seismic vulnerability concerns
- The Brahmaputra basin has one of the world's highest concentrations of proposed hydropower dams (~168 dams planned in Arunachal Pradesh alone)
Connection to this news: The ecological stakes of Demwe Lower extend beyond the dam site — cumulative impacts on the Brahmaputra hydrology, sediment flow, and downstream fisheries in Assam and Bangladesh are significant Mains-level concerns.
Hydropower in India's Energy Policy and Northeast Strategy
Hydropower is classified as a renewable energy source under India's energy policy and counts toward renewable energy targets. Arunachal Pradesh has an estimated hydropower potential of 57,000 MW — the highest of any Indian state — and the Central government views it as critical to India's clean energy transition and border area development.
- India's total installed hydropower capacity: ~47 GW (as of 2025), target to add 10 GW/year
- Hydropower counts toward India's Paris Agreement NDC target of 500 GW non-fossil fuel capacity by 2030
- Northeast hydropower projects carry strategic significance — they power border areas and are linked to India's Act East policy
- Demwe Lower is a run-of-river project — less water storage than reservoir dams but still involves significant diversion
- NHPC (National Hydroelectric Power Corporation) and private developers operate in Arunachal
- The Forest (Conservation) Act, 1980 (as amended in 2023) governs forest diversion for hydropower projects
Connection to this news: The tension between Arunachal's hydropower potential and its ecological sensitivity is a recurring Mains theme — development vs. environment, federal relations, and border area security all intersect.
Key Facts & Data
- Project: 1,750 MW Demwe Lower Hydroelectric Project, River Lohit, Arunachal Pradesh
- EC extension: 11 years (to 2037), granted by EAC under MoEFCC in January 2026
- Legal doctrine used: "Zero period" — excludes litigation time from EC validity
- NGT action (2017): Suspended wildlife clearance, directed NBWL to reconsider
- Dam height: 162.12 metres
- Forest diversion: 1,416 hectares; Submergence: 1,589.97 hectares
- Proximity: Near Kamlang Tiger Reserve, upstream of Parasuram Kund
- Governing law: EIA Notification 2006 (under Environment Protection Act 1986), Wildlife (Protection) Act 1972
- Arunachal Pradesh's total hydropower potential: ~57,000 MW
- Nodal authority: MoEFCC (central clearance, Category A project)