Examine how ownership structure and pricing incentives in renewable energy schemes can determine environmental outcomes, using solar irrigation in India as a case study.

Renewable energy is environmentally benign at the point of generation, but its downstream ecological footprint depends on who owns the asset and what price signal the user faces. PM-KUSUM, targeting 34,800 MW of solar capacity by March 2026 with ₹34,422 crore of central support [1], illustrates how design — not technology — decides outcomes.

Ownership structure shapes the incentive to conserve

• Component-B provides 14 lakh standalone off-grid pumps [1]; nearly 2.95 lakh were installed at one reporting stage [2]. The farmer owns an isolated asset whose only output is water — surplus energy has no alternative use, so the rational response is to pump more.
• Component-C solarises 35 lakh grid-connected pumps [1]. Under individual pump solarisation, the farmer can sell surplus solar power to the DISCOM, converting saved water into income [3].
• Under feeder-level solarisation, the DISCOM owns generation and there is no farmer-level surplus sale [3] — reliable day-time power is delivered, but the conservation incentive is weaker than in the buy-back model.

Pricing incentives determine extraction intensity

• Solar pumping has near-zero marginal cost; with free or flat-rate farm power, the price signal restraining extraction disappears, risking aquifer depletion.
• A buy-back tariff restores that signal by giving water saved a positive money value — the environmental gain follows from pricing architecture, not from panels.
• The genuine gains are real where the counterfactual is diesel: 2.09 lakh pumps solarised and 89.45 MW installed cut roughly 0.67 million tonnes of CO₂ and 143 million litres of diesel annually [4].

Regulatory correctives

• New solar pumps are barred in CGWB-notified dark zones; only existing diesel pumps may be replaced there, conditional on micro-irrigation [5], pairing supply-side solarisation with demand-side restraint.

Solar irrigation thus delivers climate benefits automatically but water sustainability only conditionally. Embedding buy-back tariffs, metering and micro-irrigation linkage across all components would align the scheme with SDG-6 and SDG-7 together, ensuring clean energy expansion does not become a groundwater liability.