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Relevance: GS-III (Environment, Agriculture, Energy Security, Water Resources) Source: Environment & Agriculture Policy Updates, 2026

1 · Context

Over the past five years, India has installed over 2.5 million solar pumps under the PM-KUSUM scheme, successfully helping farmers move away from expensive and polluting diesel. However, a major environmental dilemma has emerged.
Since solar energy is practically free after the panels are installed, experts fear farmers will have no reason to switch off their pumps, leading to the reckless extraction of groundwater. But by allowing farmers to sell extra solar electricity back to the grid for cash, they become “prosumers” who actively save water to earn more money, rather than pumping it endlessly.

2 · The Solar-Water Dilemma

Step 1: The Solar Revolution
Through PM-KUSUM, millions of farmers received subsidized solar water pumps, significantly cutting down harmful carbon emissions and diesel costs.
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Step 2: The Groundwater Fear
Because sunlight is free, the “zero marginal cost” of running a solar pump creates a risk: farmers might leave pumps running all day, draining precious underground aquifers.
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Step 3: The ‘Prosumer’ Solution
If these pumps are connected to the power grid, farmers can sell their unused electricity for cash. This gives them a powerful financial reason to use less water and save power.
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Step 4: Smart Regional Policies
Water-scarce states (like Punjab) urgently need this grid-connected buyback model, while energy-poor states (like Eastern India) still need basic standalone pumps to boost farming.

3 · Key Economic & Environmental Concepts

PM-KUSUM Scheme
De-dieseling Agriculture
India’s flagship mission to provide standalone solar pumps and solarize existing grid-connected agricultural pumps, reducing reliance on fossil fuels.
Zero Marginal Cost
The Free Power Trap
An economic concept where the cost of running a machine (like a solar pump) is almost zero, often leading to the tragic overuse of natural resources like water.
The Prosumer
Producer + Consumer
A revolutionary model where farmers not only consume solar electricity but also produce and sell their surplus power back to the state grid for extra income.
Water-Energy Nexus
The Balancing Act
The intricate relationship where smart electricity pricing directly helps in saving groundwater, reducing state subsidies, and cutting national carbon emissions simultaneously.

Prelims Quick Facts: Policies & Solutions
The SKY Scheme Gujarat’s Suryashakti Kisan Yojana (SKY) successfully pioneered the “prosumer” concept, guaranteeing feed-in tariffs to farmers for selling surplus solar power back to the grid.
Eastern India’s Needs In energy-poor zones like Eastern India, farming is limited by a lack of diesel, not water. Here, simple standalone solar pumps critically improve farming without drying aquifers.
PM-KUSUM Components It has 3 parts: (A) Decentralized solar plants, (B) Standalone off-grid solar pumps, and (C) Solarization of existing grid-connected pumps.
Micro-Irrigation Push To maximize “crop per drop,” the massive fiscal savings generated by reducing electricity subsidies must be aggressively reinvested into drip and sprinkler irrigation systems.

MCQ Practice Question
Q. With reference to the PM-KUSUM scheme and solar irrigation in India, consider the following statements:

  1. Component C of the PM-KUSUM scheme focuses exclusively on the solarization of existing grid-connected agricultural pumps.
  2. The “Zero Marginal Cost” nature of off-grid solar pumps provides a strong financial incentive for farmers to reduce groundwater pumping.
  3. The Suryashakti Kisan Yojana (SKY) in Gujarat successfully pioneered the concept of farmers selling surplus solar power back to the grid.

Which of the statements given above is/are correct?
(a) 1 and 2 only    (b) 1 and 3 only    (c) 2 and 3 only    (d) 1, 2 and 3

Answer: (b) 1 and 3 only

  • Statement 1 — Correct: PM-KUSUM Component C specifically deals with solarizing existing grid-connected agriculture pumps.
  • Statement 2 — Incorrect (the trap): The “Zero Marginal Cost” of off-grid solar (free sunlight) actually removes the financial incentive to limit pumping, which often leads to the over-extraction of groundwater unless they are connected to the grid to sell power.
  • Statement 3 — Correct: The SKY scheme in Gujarat was a pioneering model that turned farmers into “prosumers,” allowing them to earn money by feeding surplus electricity into the state grid.
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