India's Water Stress and the Water-Energy Nexus

A real question on this chapter rarely stops at "India is water-stressed". It tests something sharper: what exact per-capita figure crosses the water-stress threshold, which state actually tops the country in groundwater over-extraction (it is not always the state an aspirant assumes), and how a scheme's real numbers, districts, states, budget, differ from a vaguely remembered version. This note works through three clusters: India's water stress in hard numbers, groundwater depletion and the Atal Bhujal Yojana's verified details, and the water-energy nexus, the two-way dependency where generating power needs water and moving or treating water needs power, each anchored to a primary government or research figure.

India's water stress

India's water availability is measured against a fixed international yardstick: annual per-capita availability below 1,700 cubic metres is classified as a water-stressed condition, and below 1,000 cubic metres as water scarcity. Based on the Central Water Commission's own study, "Reassessment of Water Availability in India using Space Inputs, 2019", India's average annual per-capita water availability was assessed at 1,486 cubic metres for 2021, falling further to a projected 1,367 cubic metres by 2031. Both figures sit below the 1,700 cubic metre threshold, which is the exam-relevant point: India crossed into water stress some time ago, it is not a future risk being projected for the first time, and the CWC's own reassessment shows the number falling further, not stabilising.

This is a quantity problem, distinct from the quality problem of contaminated groundwater (arsenic, fluoride, CPCB's river-quality classes) covered elsewhere in this reference. A river can meet every CPCB water-class standard for a stretch and India can still be short of water, because per- capita availability is a function of total renewable water resources divided by a growing population, not of how clean any given source is. Water being a State subject under the Constitution, the Central Government's role here is technical and financial support, through schemes like Jal Jeevan Mission (rural tap-water coverage), AMRUT 2.0 (urban water security) and Pradhan Mantri Krishi Sinchayee Yojana (irrigation efficiency), rather than direct water management, which is why almost every water scheme question also tests this Centre-State division of responsibility.

Groundwater depletion and management

Groundwater is not a minor share of India's water use, it is the backbone of it: per the government's own background note to the Atal Bhujal Yojana cabinet approval, groundwater supplies nearly 65% of India's total irrigated area and nearly 85% of rural drinking water. That concentration is exactly why groundwater over-extraction is a food-and- drinking-water security question, not just an environmental one.

The Central Ground Water Board (CGWB), jointly with State governments, publishes an annual Dynamic Ground Water Resource Assessment, and its most recent published state-wise figures (2025 assessment) contain a trap worth knowing precisely: Punjab's Stage of Ground Water Extraction stood at 156.36%, the highest of any State, ahead of Rajasthan at 147.11% and Haryana at 136.75%, with Delhi at 92.10% as an urban outlier worth noting separately. A "Stage of Extraction" above 100% means a State is extracting more groundwater annually than is naturally replenishing, and Punjab, not Haryana, currently carries the country's worst ratio, a detail that reverses the assumption that Haryana or Rajasthan must lead simply because Punjab is thought of as India's post-Green- Revolution breadbasket rather than its most extraction-stressed State. Nationally, the 2025 assessment recorded total annual groundwater recharge of 448.52 Billion Cubic Metres (BCM), an annual extractable resource of 407.75 BCM, and annual extraction for all uses of 247.22 BCM, giving the country's average Stage of Extraction as 60.63%, with 730 of 6,762 assessment units (10.80%) categorised "Over-exploited", alongside 201 units "Critical", 758 "Semi-critical" and 127 "Saline". The immediately preceding 2024 assessment had recorded a near-identical national average of 60.47% and over-exploited units at 11.1% of 6,746 units, itself down from 17.24% over-exploited in 2017, a genuine national improvement driven mainly by rising recharge from tanks, ponds and water conservation structures (up from 13.98 BCM in 2017 to 25.34 BCM in 2024), the direct product of the Jal Shakti Abhiyan: Catch the Rain campaign's annual, mission-mode water-body rejuvenation drive. That national improvement coexists with Punjab, Haryana and Rajasthan remaining individually critical, a reminder that an aggregate "improving" trend can mask worsening conditions in specific States, a favourite examiner contrast. Independent of India's own assessment, a 2015 NASA-funded study led by UC Irvine, using data from the GRACE satellites, found the Indus Basin aquifer, which underlies Punjab, Haryana and Rajasthan as well as Pakistan, to be the world's second-most overstressed aquifer, behind only the Arabian Aquifer System, independent confirmation from satellite gravimetry of what CGWB's own ground-based assessment shows.

The Centre's flagship response is the Atal Bhujal Yojana (ATAL JAL), approved by the Union Cabinet on 24 December 2019 as a Central Sector Scheme under the Department of Water Resources, River Development and Ganga Rejuvenation, Ministry of Jal Shakti, with a total outlay of Rs 6,000 crore over five years (2020-21 to 2024-25). Its funding structure is a specific, testable detail: 50% is a World Bank loan, repaid by the Central Government, and the remaining 50% is Central Assistance from budgetary support, with both components passed to States entirely as grants. The scheme was implemented in identified water-stressed blocks across seven States: Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan and Uttar Pradesh, eventually covering 8,203 Gram Panchayats across 229 blocks in 80 districts. Its defining design choice, and the one most likely to be tested conceptually, is that ATAL JAL is built around demand-side management, panchayat-led water budgeting, crop diversification, micro-irrigation and behavioural change at the community level, rather than the supply-side approach (building more recharge structures) that had dominated earlier groundwater schemes; supply- side works were still funded (more than 83,000 recharge structures such as check dams, ponds and shafts were built or renovated under the scheme), but the incentive structure explicitly rewarded States for demand-side outcomes. The Centre also operates the Central Ground Water Authority (CGWA), which regulates extraction nationally through Guidelines notified on 24 September 2020, including penalties, mandatory No Objection Certificates and bans on new large-scale industry in over-exploited areas, a regulatory backstop distinct from ATAL JAL's participatory, State-specific model.

The water-energy nexus

Water and energy production depend on each other in both directions, and UPSC increasingly tests this as a standalone linkage rather than as two separate facts about power and water. The first direction, water needed for energy, is best evidenced by thermal power. Coal, gas and nuclear-based thermal plants require large volumes of water for cooling; per NITI Aayog- backed research, a coal plant using conventional cooling towers consumes roughly 5 to 7 cubic metres of water per megawatt-hour generated, whereas dry (air) cooling systems can cut this to as little as 0.5 to 1 cubic metre per megawatt-hour, at some cost to plant efficiency. The scale of this dependency was quantified by the World Resources Institute (WRI) in its 2018 study "Parched Power": at the time of that study, thermal plants supplied roughly 83% of India's electricity, nearly 90% of that thermal generation depended on freshwater for cooling, and 40% of India's thermal power plants were located in areas of high water stress. The consequence was not hypothetical: WRI found that 14 of India's 20 largest thermal utilities experienced at least one shutdown due to water shortages between 2013 and 2016, at a combined cost of $1.4 billion, and projected that 70% of India's thermal plants would face high water stress by 2030. This is the exam-relevant mechanism: water scarcity does not just threaten drinking supply, it directly threatens electricity generation capacity, which is why India's 2015 emission notification for thermal plants (covered in this reference's pollution chapter) also carries water-consumption limits for new plants, water and emissions regulation moving together. Hydropower carries a related but distinct exposure: its output is not cooling-water demand but a direct function of river flow and reservoir storage, so the same monsoon variability that threatens agriculture also makes hydropower generation uneven across the year and across drought years, which is why hydropower is normally paired with thermal or other dispatchable capacity rather than relied upon as a stand-alone baseload source.

The second direction, energy needed for water, is the less obvious half of the nexus and the one most directly tied to the groundwater depletion above. Extracting, treating, pumping and transporting water all consume electricity, and where that electricity is free or heavily subsidised, extraction stops responding to scarcity. Punjab's farm-power tariff has been free since 1997, and peer-reviewed research comparing Punjab with neighbouring Haryana has linked that policy directly to a measurably faster rate of groundwater decline in Punjab, an illustration of how an energy subsidy, not a water policy at all, can be the actual driver of a water resource crisis. The Punjab government's "Paani Bachao, Paisa Kamao" ("save water, earn money") pilot, launched in 2018 with World Bank support, tests the inverse mechanism deliberately: it offers farmers a direct monetary payment for consuming less power on their agricultural feeders, converting an energy incentive into a water-saving one. Desalination and long-distance water transfer, both energy-intensive water supply solutions, extend the same logic further, water security increasingly depends on the availability and price of energy, not just on rainfall or aquifer recharge.

Exam angle

This chapter rewards knowing which specific figure a question is quoting and from which year's assessment, because the underlying numbers move annually and older figures are common distractor material. A statement naming Haryana as India's most groundwater-stressed State, for instance, is usually testing whether an aspirant knows Punjab actually carries the highest Stage of Extraction (156.36% against Haryana's 136.75% in the most recent state-wise assessment), a correction against the intuitive assumption that Punjab's Green Revolution success implies sustainable water use. Similarly, a question may quote India's per-capita water availability without specifying it is a 2021 assessed figure from a 2019 CWC study, or conflate the 1,700 cubic metre water-stress threshold with the 1,000 cubic metre water-scarcity threshold, two numbers that are easy to transpose. Atal Bhujal Yojana questions are frequently tested on its funding split (50% World Bank loan, 50% Central Assistance) and its demand-side design philosophy rather than its topline budget figure alone, since "Rs 6,000 crore" without context reveals little about how the scheme actually works. Finally, the water-energy nexus is tested as a mechanism, not a list of facts: know that thermal plants can be forced offline by water shortage (a real, costed event per WRI) and that subsidised electricity can itself cause groundwater depletion (Punjab's tariff policy) before memorising any individual number in isolation.

Quick revision points

• Water stress threshold: below 1,700 cubic metres per capita annually. Water scarcity threshold: below 1,000 cubic metres. India's assessed per-capita availability: 1,486 cubic metres (2021), projected 1,367 cubic metres (2031), per CWC's 2019 reassessment study.
• Groundwater supplies about 65% of India's irrigated area and about 85% of rural drinking water.
• Stage of Ground Water Extraction (2025 CGWB assessment): Punjab 156.36% (highest in India), Rajasthan 147.11%, Haryana 136.75%; national average 60.63%, with 10.80% of assessment units over-exploited.
• Indus Basin aquifer (Punjab, Haryana, Rajasthan, Pakistan): world's second-most overstressed aquifer, per a 2015 NASA GRACE satellite study led by UC Irvine, behind only the Arabian Aquifer System.
• Atal Bhujal Yojana: Cabinet-approved 24 December 2019; Rs 6,000 crore over 2020-21 to 2024-25; 50% World Bank loan, 50% Central Assistance; seven States (Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, Uttar Pradesh); final coverage 8,203 Gram Panchayats, 229 blocks, 80 districts; built around demand-side management led by panchayats, not primarily supply-side construction.
• Water-energy nexus: thermal plants need water for cooling (WRI: roughly 83% of India's electricity was thermal, 90% of that freshwater-cooled, 40% of plants in high water-stress areas, 14 of the 20 largest utilities suffered shutdowns in 2013-16 costing $1.4 billion). Conversely, subsidised farm electricity (for example, Punjab's free power since 1997) drives excess groundwater pumping, energy policy shaping water outcomes, not the other way round.

Try a few questions now to see whether it is the year, the State, or the funding split that the question is quietly testing.