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Arunachal’s Etalin hydel project | UPSC
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“Why Arunachal’s Etalin hydel project can be a worry“
SOURCES: DOWNTOEARTH
HEADLINES:
Floods, earthquakes, landslides: Why Arunachal’s Etalin hydel project can be a worry
CENTRAL THEME:
Formation of glacial lakes driven by climate change and sesimic risks pose threat to nature and life; project’s environmental clearance needs review, say experts
SYLLABUS COVERED: GS 1:3:Dams :Earthquakes : Seismic activity : Arunachal’s Etalin hydel project
MAINS QUESTION:
Why Arunachal’s Etalin hydel project can be a worry . Discuss -(GS 3)
LEARNING:
We have integrated all the consequences of this issue divided in four parts :
- Seismic hazards
- Glacial hazards
- Flooding events
- Landslides
Let us dive in !
INTRODUCTION:
The contentious 3,097-megawatt Etalin Hydroelectric Project (EHEP) — proposed to be developed as a joint venture between Jindal Power Ltd and the Hydropower Development Corporation of Arunachal Pradesh Ltd — in the state’s Dibang Valley has again sparked concerns over damage to ecology and threat of natural disasters.
- AMBITIOUS PROJECT :It is a combination of two run-of-the-river schemes with limited storage requiring concrete gravity dams on rivers Tangon and Dri
BODY:
“The region is a high-mountain watershed prone to natural hazards because of its unique and complex geological, ecosystem, weather and climatic conditions,”
FOUR SPECIFIC RISKS:
- Seismic hazards
- Glacial hazards such as glacial lake outburst floods
- Flooding due to extreme precipitation events
- Landslides
CLIMATE CHANGE-DRIVEN GLACIAL RISKS
- NEAREST GLACIER : The rivers on which the two mega dams have been proposed are located 80 kilometres from the closest glacier.
- GLACIAL LAKES :The Dibang watershed has approximately 350 glacial lakes with a cumulative area of 50 square kilometres.
CLIMATE CHANGE AND GLACIAL LAKES :
- LOST MASSES : These glaciers have lost mass and retreated due to climate change.
- LESS VOLUME : They are set to lose up to 40 per cent of their current volume by 2030 and 60 per cent by 2050.
- SUPRAGLACIAL LAKES : One of the consequences of glacial thinning is the emergence of lakes on the surface of glaciers (supraglacial lakes).
- GLOFs entail heavy costs to human life and livelihood. Ex: Kedarnath floods and landslides that claimed 5,500 lives.
CONCERNS ON STEADY FLOW :
Regular glacial melt — climate change will further aggravate these risks.
- Supraglacial lakes have already formed and ice chunks broken off glaciers.
- Climate change-driven glacial melts have severe impact on electricity generation capacity of dams .
- Predictable summer glacial melt of Dibang river will be likely replaced by far less predictable rainfall events and snow-melt runoffs.
STABLE STREAM FLOW ?
- This puts the feasibility of hydroelectric projects such as Dibang Multipurpose Project (DMP) in severe jeopardy, for the electricity generation of these projects depends on predictable and stable stream flow.
SEISMIC RISKS
- TECTONIC BELT : “This is a tectonically active, geologically unstable part of the Himalayas.
- AGGRAVATE THE INSTABILITIES: In fact, the entire Himalayas are unstable because they are still rising from the Indian plate by pushing against the Eurasian plate.
- TOTAL EARTHQUAKES : Since the 1900s, 34 earthquakes have occurred in Dibang Valley district.
LANDSLIDE RISKS
- HAZARDOUS ACTIVITIES : The rate of increase in landslide activity is expected to be greatest over areas covered by current glaciers .
- HEAVY RAINFALLS : “Incidences of heavy rainfall will increase with climate change exaggerate landslides .
IASbhai Windup:
IS LARGE HYDEL REALLY RENEWABLE?
- NAMING DILEMMA : Projects of more than 25 MW, should be classified as a renewable source of energy.
- RISKS : The multiple risks and uncertainties mentioned above, however, make this move questionable.
- ACCOUNTABILITY : The ‘renewable’ status is given to grant certain incentives to generators of renewable sources of energy.
Once these lands are used for construction of dams, they’re not usable again.
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