India has a vast network of irrigation canals. What if the canals could also make power, without taking any farmland?
This lesson explains canal-top solar in simple steps. It covers the first plants, the 131 GW estimate, the costs and the new floating solar scheme. For the wider picture, see Solar Energy in India and the National Solar Mission.
- What: solar panels built over canals, or on canal banks.
- Potential: about 131 GW of canal-top plus canal-bank solar, per a 2024 CSTEP-linked assessment.
- First plant: 1 MW near Chandrasan, Mehsana, Gujarat, inaugurated April 2012.
- Top states: Uttar Pradesh, Bihar, Karnataka, Andhra Pradesh, Punjab.
- Trade-off: no extra land, but higher cost than ground plants.
What Is Canal-Top Solar?
What does canal-top solar mean and why is it useful?
Canal-top solar means solar panels held on steel frames over a canal. Canal-bank solar means panels on the land beside it. Canals already exist, so the plant needs no extra farmland. (Source: The Hindu, 23 Sep 2026)
Three benefits follow. Panels shade the water, which cuts evaporation. The water below also keeps the panels cooler. (Source: Mongabay)
Think of a roof over a veranda. The space was already there. You just use the top of it. For how canals are built and used, see Irrigation Systems in India.
Check 1
Canal-top solar needs no extra farmland.
How Did Gujarat Lead the Way?
What was India’s first canal-top plant?
It was a 1 MW plant over a 750 m stretch of a Narmada branch canal. It stands near Chandrasan in Mehsana district, Gujarat. It was inaugurated in April 2012. It saves about 9 million litres of water a year. (Source: Wikipedia)
The Narmada waters come from the Sardar Sarovar project. See Narmada Valley and Dams of India for the background.
What did the study find?
A three-year GERMI study looked at the Chandrasan plant. Its panels ran about 10 deg C cooler than ground-mounted ones. That gave about 2.5% better efficiency. (Source: Mongabay)
Efficiency here means how much sunlight turns into power.
What came next at Vadodara?
A 10 MW plant on the Vadodara branch canal began generating in November 2014. It runs about 3.6 km and has about 33,800 panels. (Source: Scientific American)
It was estimated to prevent about 90 million litres of evaporation a year. (Source: Scientific American)
Check 2
The 10 MW Vadodara plant was India’s first canal-top plant.
What Does the 131 GW Estimate Say?
Where does the 131 GW number come from?
The Hindu reported on 23 September 2026 on a 2024 assessment co-authored by CSTEP. It puts combined canal-top and canal-bank potential at about 131 GW. (Source: The Hindu report)
This is potential, not capacity built. No nationwide canal-length figure is used here, because none has been verified.
What did the study assume?
The study assumed panels over canals up to 30 m wide. For canals wider than 30 m, it assumed vertical bifacial panels. (Source: The Hindu via now.solar)
Bifacial panels catch light on both faces. Standing them upright on the banks leaves the wide canal open.
Which states have the most potential?
The five states with the highest estimated potential are Uttar Pradesh, Bihar, Karnataka, Andhra Pradesh and Punjab. (Source: The Hindu, CSTEP assessment)
For a dry-region canal, compare The Indira Gandhi Canal.
Check 3
The 131 GW figure is potential, not capacity already installed.
How Does It Compare with Other Options?
| Point | Canal-top | Ground-mounted | Floating |
|---|---|---|---|
| Land | No extra farmland | Needs its own land | Sits on water bodies |
| Cooling | Modules about 10 deg C cooler (Chandrasan) | Baseline in the GERMI study | Not covered here |
| Evaporation | Shade cuts it | No effect | Not covered here |
| Cost (Vadodara estimate) | About $2.8 million per MW | About $2.3 million per MW | Not covered here |
| Policy push | 2014-15 MNRE pilot | Not covered here | PM Surya Sarovar Yojana, 2026 |
Cost figures are Reuters estimates reported by (Source: Scientific American). Other cells are drawn from the sources cited in this lesson.
Think it through: A canal-top plant costs more per MW than a ground plant. Why might a state still choose it? Hint: think about land, water and cooling.
What Was the MNRE Pilot Scheme?
What did the 2014-15 pilot aim for?
MNRE’s pilot scheme was run through SECI. It aimed at 50 MW canal-top and 50 MW canal-bank. (Source: SECI)
Sanctioned canal-top projects included Punjab 20 MW, Karnataka 10 MW and Uttar Pradesh 3.5 MW at Lalitpur. A sanction is only an approval. It does not prove a plant is running today. Mongabay confirms about 20 MW installed in Punjab. (Source: Mongabay)
What support did it offer?
Support was Rs 3 crore per MW for canal-top and Rs 1.5 crore per MW for canal-bank. It was capped at 30% of project cost. (Source: SECI)
Check 4
A sanctioned project under the pilot scheme is proof the plant is operating today.
What Are the Costs and Limits?
Why do canal-top plants cost more?
They need elevated steel structures. Mounting is about 40% of capital cost. (Source: Mongabay)
Cleaning and repairs over a working canal are harder. Structures must resist wind. They must also not block canal operations. (Source: The Hindu, 23 September)
The wider environmental effects of large water projects are covered in Environmental Impact of Dams.
Check 5
Elevated steel structures make canal-top plants costlier than ground plants.
How Do Floating Solar and PM-KUSUM Fit In?
What is the PM Surya Sarovar Yojana?
On 31 July 2026, the Cabinet approved the Rs 5,070-crore PM Surya Sarovar Yojana. It targets 5,000 MW of floating solar. That means panels on rafts over reservoirs and lakes. (Source: PIB)
It includes at least two hours of co-located storage, or 10,000 MWh. Central support is Rs 1 crore per MW. Sanctions run from FY2026-27 to FY2030-31. India’s floating capacity is now about 700 MW. (Source: PIB)
This scheme is for floating solar. It is not a canal-top scheme. For storage, see Pumped Storage Hydropower.
Where does PM-KUSUM fit?
PM-KUSUM is a separate scheme. It supports decentralised solar plants and solar farm pumps. (Source: MNRE PM-KUSUM)
Check 6
PM Surya Sarovar Yojana is a canal-top solar scheme.
Current Affairs: Canal Solar and Floating Solar
What is new in 2026?
- [Data] The Hindu on 23 September 2026 reported the 131 GW canal-top and canal-bank estimate. The top five states are UP, Bihar, Karnataka, Andhra Pradesh and Punjab. (Source: The Hindu coverage) So what: it shows how much solar India could add without taking farmland.
- [Policy] On 31 July 2026, the Cabinet approved the Rs 5,070-crore PM Surya Sarovar Yojana for 5,000 MW of floating solar with storage. (Source: PIB) So what: water-surface solar now has a funded national scheme.
Exam Traps
131 GW is estimated potential, not built capacity.
Chandrasan (1 MW, 2012) came first. Vadodara (10 MW, 2014) came later.
Pilot-scheme sanctions are not proof of working plants.
PM Surya Sarovar Yojana is for floating solar. PM-KUSUM is a separate scheme.
MCQ on Canal-Top Solar
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