Discuss the geological basis of geothermal provinces in India. How can direct-use geothermal applications support livelihoods in high-altitude regions like Ladakh?

Geothermal energy is heat from the Earth's interior. It comes mainly from the radioactive decay of uranium, thorium and potassium [1]. The Geological Survey of India (GSI) has mapped 381 hot springs across 10 geothermal provinces [1][2]. Most sites suit direct heat use better than large power plants, which helps cold regions like Ladakh.

Geological basis of geothermal provinces

• Common mechanism: mantle convection drives tectonic activity. Faults and fractures let heat rise and trap hot water in permeable rock [1].
• Collision zone, Himalayan Province (Puga, Chumathang, Manikaran): the collision of the Indian and Eurasian plates created deep faults. Temperatures of up to 135°C have been recorded beneath Puga [1].
• Rift zones, Son-Narmada-Tapi (Tattapani), Cambay Graben, Mahanadi, Godavari: stretching and faulting of the crust carry heat upward. PIB notes that rift basins hold "strong scope" [1].
• Plate-margin and coastal belts, Andaman & Nicobar, Naga-Lusai, West Coast: these edges are active or faulted and host warm springs.
• Stable shields, Aravalli, South Indian Craton: heat flow is low, and springs follow old fault lines.
• Limit: most fluids are low-temperature. At Gandhinagar, wells give 70–80°C water and only 50–90 kW of power [1]. So the 42 promising sites are listed for both power and direct heat [2].

Mantle heat → convection → collision / rifting → faults → hot-water reservoir → hot springs

Fig: How tectonics creates India's geothermal provinces

Direct-use applications for Ladakh's livelihoods

• Greenhouse farming: hothouses heated by spring water grew cauliflower and strawberries in snow-bound Ladakh as early as 1976 [3]. This makes the growing season longer.
• Space heating: the 2025 policy supports Ground Source Heat Pumps for heating and cooling [1]. These can warm homes, schools and clinics and cut fuel bills.
• Cold storage: spring heat has run refrigeration plants without electricity [3]. This helps farmers store produce that spoils quickly.
• Aquaculture and geo-tourism: PIB names both as uses of geothermal heat [1]. Springs at Puga and Chumathang can support fish ponds, homestays and guiding.
• Reliable power: geothermal energy does not depend on the weather [1]. The Puga wells, at over 14,000 ft, lead to a 1 MW demonstration plant [1].

India's geothermal provinces follow its tectonic map: plate collision in the Himalaya and rifting in the Peninsula. Since most sites are low-temperature, the way forward is heat first, power later. MNRE's RE-RTD programme can fund direct-use pilots, and a national geothermal data repository can share results openly [1]. This would turn a 50-year-old idea into steady, clean livelihoods, in line with SDG 7 and Net Zero 2070 [1].