If solar irrigation is over-drawing groundwater, you’re doing it wrong

Environment & Agriculture · 3 September 2026 · Based on The Hindu (original report)

2-minute summary

India's PM-KUSUM scheme has successfully deployed over 2.5 million subsidized solar irrigation pumps to support smallholder farmers. However, as the government prepares for PM-KUSUM 2.0, concerns persist that free solar power will accelerate groundwater depletion. This article argues that solar irrigation is not a monolith; its impact depends on policy design and local conditions. Grid-connected models, such as Gujarat's Suryashakti Kisan Yojana (SKY), offer feed-in tariffs (e.g., Rs 7/unit) that incentivize farmers to conserve water and sell surplus energy back to the grid. Similarly, fee-for-service models promote efficient water use. Furthermore, the impact of solar pumps is shaped by local hydrogeology and cropping patterns. In water-stressed, hard-rock aquifer regions, solarization must be carefully managed, whereas in water-abundant Eastern India, it can sustainably boost productivity. Ultimately, PM-KUSUM 2.0 must move away from a one-size-fits-all approach, tailoring incentives to regional ecological realities to balance clean energy transition with groundwater sustainability.

Why it's in the news

As India prepares to transition to PM-KUSUM 2.0 after installing over 2.5 million subsidized solar pumps, policymakers are focusing on how to prevent the clean energy transition from inadvertently accelerating groundwater depletion.

Background and context

For decades, Indian agriculture has relied on heavily subsidized or free grid electricity and diesel pumps for irrigation. While this boosted crop yields, it led to severe groundwater depletion, high carbon emissions, and a massive fiscal burden on state power distribution companies (DISCOMs). To address these challenges, the Ministry of New and Renewable Energy (MNRE) launched the PM-KUSUM scheme in 2019. The scheme aims to provide energy security to farmers, de-dieselize the farm sector, and solarize agricultural feeders. However, because solar power has zero marginal operating costs, critics argue that standalone solar pumps give farmers unlimited access to free water, risking rapid aquifer depletion. The debate has now shifted toward designing smart, grid-connected solar models that incentivize water conservation by allowing farmers to sell surplus power.

Constitutional provisions

• Article 48A — Directive Principle of State Policy directing the State to protect and improve the environment and safeguard water resources.
• Article 21 — The Right to Life, which has been judicially interpreted by the Supreme Court to include the right to clean and sufficient water.
• Seventh Schedule (List II, Entry 17) — Water is primarily a State subject, which means state-level implementation and customized regional models are crucial for groundwater management.

Committees and reports

• Mihir Shah Committee on Water Reforms — Recommended a shift from water-resource development to integrated water-resource management, emphasizing demand-side management and crop diversification.

Government schemes

• Pradhan Mantri Kisan Urja Suraksha evam Utthan Mahabhiyan (PM-KUSUM) — Aims to add solar and other renewable capacity of 34,800 MW by 2026 through solarization of pumps and feeders.
• Suryashakti Kisan Yojana (SKY) — An innovative feeder-level solarization scheme that provides feed-in tariffs to farmers for exporting surplus solar power, encouraging water conservation.

Previous UPSC questions on this theme

• Mains GS-3 2016 — What is water-use efficiency? Describe the role of micro-irrigation in increasing the water-use efficiency.

Mains practice: The transition to solar-powered irrigation under PM-KUSUM presents a classic policy paradox of solving the energy crisis while potentially worsening the groundwater crisis. Critically analyze this statement and suggest policy measures to resolve this conflict.

The PM-KUSUM scheme, by deploying over 2.5 million solar pumps, has advanced India's clean energy goals and reduced diesel dependency. However, it creates a policy paradox: providing free, zero-marginal-cost solar power eliminates the financial constraints of pumping, risking accelerated groundwater depletion in water-stressed aquifers.

• **The Groundwater Threat of Standalone Solar**: Unlike diesel or erratic grid power, solar energy is free and available during peak daytime hours. Without pricing signals or limits, farmers have no financial incentive to conserve water, which can lead to over-extraction.

• **Model-Dependent Outcomes**: The impact is not uniform. Standalone off-grid pumps pose the highest risk. Conversely, grid-connected models, such as Gujarat's Suryashakti Kisan Yojana (SKY), turn farmers into energy producers by offering feed-in tariffs (e.g., Rs 7/unit) for surplus power, incentivizing them to conserve water and sell electricity instead.

• **Hydrogeological & Agricultural Variations**: In hard-rock aquifer zones (e.g., Peninsular India) with limited water storage, extraction is naturally constrained. In alluvial plains (e.g., Punjab), where water-intensive crops dominate, solarization reduces subsidy burdens but requires strict demand-side management. In water-abundant Eastern India, solar pumps can sustainably boost cropping intensity.

**Way Forward for PM-KUSUM 2.0**:

• **Grid Integration**: Transition standalone pumps to net-metered grid-connected systems to monetize surplus power.

• **Technology Coupling**: Mandate the integration of solar pumps with micro-irrigation systems (drip/sprinkler) through combined subsidies.

• **Local Customization**: Tailor pump capacities and subsidies based on regional aquifer mapping and water-table depths.

In conclusion, PM-KUSUM 2.0 must shift from a technology-centric approach to a resource-centric one, integrating energy subsidies with groundwater governance to ensure sustainable agriculture.

Prelims practice questions

Q1. With reference to the PM-KUSUM scheme, consider the following statements: 1. It is implemented by the Ministry of Agriculture and Farmers Welfare. 2. Component-C of the scheme involves the solarisation of grid-connected agricultural pumps. 3. The scheme allows farmers to sell surplus solar power back to the grid. Which of the statements given above are correct?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

Answer: B. Statement 1 is incorrect because PM-KUSUM is implemented by the Ministry of New and Renewable Energy (MNRE). Statements 2 and 3 are correct as Component-C focuses on solarising grid-connected pumps, enabling net-metering and the sale of surplus power.

Q2. In the context of agricultural resource management, how does a 'feed-in tariff' model, such as Gujarat's Suryashakti Kisan Yojana (SKY), help in conserving groundwater?

1. By legally restricting the hours of groundwater extraction
2. By providing financial incentives to sell surplus solar power back to the grid instead of pumping water
3. By charging farmers a high tariff for solar power consumption
4. By mandating the cultivation of low-water-intensity crops

Answer: B. Feed-in tariffs allow farmers to sell surplus solar electricity back to the grid at an attractive rate. This opportunity cost of using power for pumping incentivizes them to conserve water and maximize energy sales.

Q3. Which of the following hydrogeological regions in India is characterized by hard-rock aquifers with low storage capacity, where solar pump utilization must be carefully managed to prevent rapid localized depletion?

1. Brahmaputra Valley
2. Peninsular India
3. Indo-Gangetic Alluvial Plains
4. Coastal Alluvial Belts

Answer: B. Peninsular India is dominated by hard-rock aquifers (crystalline and basaltic) which have low primary porosity and storage capacity, making them highly vulnerable to rapid localized depletion if over-pumped.

Revision flashcards

• What is the primary objective of Component-C of the PM-KUSUM scheme? Feeder-level solarization and the solarization of existing grid-connected agricultural pumps to enable farmers to sell surplus power to DISCOMs.
• How does Gujarat's Suryashakti Kisan Yojana (SKY) incentivize water conservation? It offers a feed-in tariff (approx. Rs 7/unit) for surplus solar energy exported to the grid, creating an opportunity cost for over-pumping groundwater.
• Why does the impact of solar irrigation on groundwater depletion vary in Eastern India compared to Northwest India? Eastern India has high groundwater recharge and low current utilization (room for sustainable expansion), whereas Northwest India has over-exploited aquifers and water-intensive cropping (requiring strict conservation).
• Which Ministry administers the PM-KUSUM scheme? The Ministry of New and Renewable Energy (MNRE).
• What is the 'water-energy-food nexus' in the context of Indian agriculture? The interdependent relationship where subsidized energy drives groundwater extraction for food production, meaning policy changes in one sector directly impact the other two.