Indian farmers spend ₹50,000 to ₹2,00,000 per year on diesel and electricity to run irrigation pumps. Solar energy eliminates this cost permanently — and with PM Kusum subsidies covering up to 60% of the system cost, the investment pays back in just 2–4 years.
The Problem Solar Solves for Farmers
Agricultural pump irrigation is India's largest electricity consumer — accounting for roughly 18% of total electricity consumption. Yet farmers face two persistent problems: unreliable grid power (often limited to 6–8 hours per day in many districts) and rising diesel costs for pump sets when grid power is unavailable.
Solar water pumps solve both problems simultaneously. They generate power during daylight hours — exactly when irrigation is most needed — with no fuel cost, no dependence on the grid, and minimal maintenance.
PM Kusum Scheme: The Game-Changer
The Pradhan Mantri Kisan Urja Suraksha evam Utthan Mahabhiyan (PM Kusum) scheme is a ₹34,035 crore programme to solarise 35 lakh agricultural pumps. Under Component-B (standalone solar pumps), farmers receive:
- 30% central government subsidy
- 30% state government subsidy (Karnataka matches the central subsidy)
- Farmer contribution: only 40% of system cost — or less with bank financing
| Pump Size | Full Cost | After 60% PM Kusum Subsidy | Farmer Pays |
|---|---|---|---|
| 3 HP Solar Pump | ₹2.5–3.5 lakh | ₹1.5–2.1 lakh covered | ₹1–1.4 lakh |
| 5 HP Solar Pump | ₹3.5–5 lakh | ₹2.1–3 lakh covered | ₹1.4–2 lakh |
| 7.5 HP Solar Pump | ₹5–7 lakh | ₹3–4.2 lakh covered | ₹2–2.8 lakh |
| 10 HP Solar Pump | ₹7–9.5 lakh | ₹4.2–5.7 lakh covered | ₹2.8–3.8 lakh |
Types of Agricultural Solar Systems
1. Solar Water Pumps (most common)
DC or AC solar pumps powered directly by panels. DC pumps are simpler and cheaper (no inverter needed) but limited to lower HP. AC pumps with solar inverters can run any standard agricultural pump. Both types are available in surface and submersible configurations for open wells, bore wells, and canals.
2. Solar-Wind Hybrid Pump Systems
Combining solar with a small wind turbine ensures irrigation even on partially cloudy days and during early morning/evening when solar output is low. Particularly useful in Karnataka's coastal taluks and plateau regions.
3. Solar-Powered Drip Irrigation
Pairing solar pumps with drip or sprinkler irrigation systems reduces water use by 40–60% while enabling more frequent, precise irrigation cycles. Solar power and drip irrigation together can significantly increase yield and reduce input costs for horticulture farmers.
4. Solar Farm Power Supply
Off-grid solar systems for farm houses, equipment sheds, poultry units, and dairy operations — providing lighting, fans, refrigeration, and power tools without diesel generators.
How Much Can a Farmer Save?
Consider a farmer in Tumkur running a 5 HP diesel pump for 8 hours per day during the growing season (8 months):
- Diesel consumption: ~4 litres/hour × 8 hrs × 240 days = 7,680 litres
- Annual diesel cost at ₹95/litre: ₹7.3 lakh/year
- After installing a 5 HP solar pump (farmer cost after subsidy: ~₹1.7 lakh): Annual saving: ₹7.3 lakh
- Payback period: less than 3 months
Even for farmers on grid power paying ₹1.5–2/unit subsidised agricultural tariff, annual savings of ₹50,000–₹1.5 lakh are common.
Under PM Kusum Component-A, farmers can install ground-mounted solar plants on their land (up to 2 MW) and sell power directly to the DISCOM at a fixed tariff for 25 years — turning farmland into an additional income source alongside traditional crops.