The maintenance nobody quoted for: what neglect does to a rooftop system

A rooftop solar system is sold on a payback period. That number is calculated from generation, and generation is calculated from equipment operating as designed. What happens if it does not is rarely part of the conversation.

Research published by the Council on Energy, Environment and Water in June 2026, by Debanjan Bagui and Prateek Aggarwal, put numbers to the question. The findings are uncomfortable.

What poor maintenance costs

The report models scenarios in which maintenance is irregular. In the worst of them:

• Lifetime savings may decline to zero.
• Payback periods extend beyond 25 years — longer than the period over which the system was expected to pay for itself.
• Up to 80 per cent of capital subsidies could be ineffectively utilised.

That last figure is the one with national consequences. Public money is paid out per system on the expectation that the system generates. A subsidised system producing well below its capacity has consumed the subsidy without delivering the outcome it was paid for.

Why cleaning specifically

Solar modules lose output when their surface is obstructed. Dust, bird droppings, pollen and construction debris all reduce the light reaching the cells, and in much of India dust accumulation is continuous rather than seasonal.

The CEEW work treats cleaning as a distinct service from broader maintenance, and it identifies a specific gap: cleaning services are typically not included in free AMC provisions. A household with an annual maintenance contract may reasonably assume cleaning is covered. Frequently it is not.

That is the practical trap. The system comes with a warranty, possibly a free AMC for some years, and neither necessarily includes the one task that most directly determines whether it keeps generating.

The market this implies

CEEW sizes the opportunity rather than only the risk. Against India's residential rooftop base — over 3 million households and more than 10 GW as of April 2026 — the report estimates:

• ₹1,900 crore for cleaning services at current capacity, rising to ₹5,400 crore at 30 GW
• ₹5,000 crore for bundled operations and maintenance services currently, reaching ₹14,400 crore by 2027
• Around 3.3 lakh jobs in the O&M sector

More than 70 per cent of that opportunity is concentrated in five states — the same concentration that characterises installation itself.

The employment finding is echoed in separate CEEW–NRDC work published in June 2026, which estimated that India's clean energy targets could create over 44 lakh full-time-equivalent jobs by 2030, with rooftop solar the single largest contributor at roughly 43 per cent, and about 13 lakh FTE jobs in operations, maintenance and manufacturing roles sustained over the lifetime of assets.

Reactive is the current default

The report characterises service delivery as predominantly reactive: attention arrives after a visible failure, not before a gradual decline. This matters because rooftop solar fails gradually far more often than it fails suddenly. Nothing switches off. Output simply drifts down, and a household with no baseline has no way to notice.

CEEW's recommendations follow from that: a national data platform for real-time monitoring of rooftop performance, consumer awareness efforts, and digital alerts. Two business models are proposed — a private platform-led marketplace, and a pay-per-use service anchored by distribution companies or state agencies.

What this means for a household

Ask what the AMC actually includes, line by line. Specifically: is panel cleaning included, how many times a year, and what happens if you need more in a dusty season?

Budget for cleaning as a running cost. It belongs in your payback calculation the way fuel belongs in the cost of a car. A payback figure that assumes no maintenance spending is not describing your system.

Do not clean panels in a way that voids anything or endangers anyone. Rooftop work is the leading physical risk in owning one of these systems. Establish with your installer who does this, from where, and with what.

Watch generation, not the roof. The panels will look fine long after output has fallen materially. Your monitoring app, checked monthly against your own baseline, is the instrument that actually detects the problem.

Sources and references

Independent research.

• Council on Energy, Environment and Water — "How Big Is India's Residential Rooftop Solar Maintenance Market?", report by Debanjan Bagui and Prateek Aggarwal, 4 June 2026, ceew.in. Full report: ceew.in PDF. Source for the market size figures, the 3.3 lakh jobs estimate, the 30 GW by 2027 target, the payback and lifetime savings modelling, the 80 per cent subsidy utilisation finding, the AMC cleaning gap, the reactive service finding and the five-state concentration. Accessed 23 August 2026.
• Council on Energy, Environment and Water and Natural Resources Defense Council — "India's clean energy targets could create over 44 lakh jobs by 2030, rooftop solar emerges as biggest employment driver", June 2026, ceew.in. Source for the 44 lakh FTE, 43 per cent rooftop share and 13 lakh O&M and manufacturing figures. Accessed 23 August 2026.

A note on the modelling. The payback, lifetime savings and subsidy utilisation figures above are outputs of CEEW's scenario modelling under stated maintenance assumptions, not measurements of installed systems. They describe what the model produces under poor maintenance, which is the point being made — they are not a claim about the average Indian rooftop system today.

ISB interpretation. The framing of gradual versus sudden failure, the rooftop safety point, and the guidance in the final section are Indian Solar Bazar's own analysis.