Mono PERC dominated the Indian solar market for the better part of a decade. It was efficient enough, affordable enough, and backed by a manufacturing ecosystem mature enough to supply projects at any scale. For a long time, it was the obvious default.
That default is changing and faster than most people expected.
According to the Fraunhofer ISE Photovoltaics Report 2025, TOPCon technology accounted for approximately 65% of global silicon solar cell production in 2024, up from roughly 20% in 2022. Over the same period, PERC’s share fell from 80% to under 25%. That isn’t a gradual shift. It’s a technology transition already well underway and the reasons behind it have direct implications for anyone making procurement decisions in 2026.
What Makes These Technologies Different
Both Mono PERC and TOPCon are built on monocrystalline silicon, so the fundamental starting point is the same. The difference is in how each handles the physics of energy conversion.
Mono PERC adds a passivation layer to the rear of the cell, reducing electron recombination and improving light absorption. It was a meaningful efficiency leap over earlier polycrystalline technology, and it remains a reliable, well-understood option.
TOPCon goes further. It deposits an ultra-thin tunnel oxide layer and a doped polysilicon film on the cell’s rear surface, reducing recombination losses more aggressively and improving open-circuit voltage. Also, TOPCon uses N-type silicon rather than P-type which means it has no sensitivity to Light-Induced Degradation (LID) or Light and Elevated Temperature Induced Degradation (LeTID), both of which affect PERC panels to varying degrees.
The result is a technology that starts higher on efficiency and holds that efficiency longer over time.
What the Performance Data Shows
Efficiency and degradation are the two figures that determine long-term project economics and on both, the gap between TOPCon and Mono PERC is measurable.
Mono PERC modules currently operate at 20.5-22% efficiency. TOPCon modules reach 22-23.5% in mass production formats. For large-scale commercial and industrial projects, even that 1-2% difference matters because fewer modules per project means lower balance-of-system costs, reduced land use, and simpler installation logistics.
On degradation, manufacturer warranties place Mono PERC at 0.55% annual degradation and TOPCon at 0.40%. The gap looks small in year one. Over 25 years, it represents a meaningful difference in total energy output and therefore in return on investment.
TOPCon also handles heat better than Mono PERC. For commercial solar installation Gujarat projects where panels operate under sustained high temperatures for much of the year, that performance difference shows up in actual annual yield, not just datasheet specifications.
Upfront Cost vs. Lifetime Value
TOPCon modules currently carry a 5-15% price premium over Mono PERC. That premium is real though it has been narrowing steadily as TOPCon manufacturing scale increases and production processes mature.
The relevant question isn’t whether TOPCon costs more upfront. It’s whether the cost per unit of energy generated over the project’s lifetime justifies the investment. For utility-scale and large industrial projects where a module’s 25-year yield is the core financial variable, the answer is increasingly yes.
For businesses evaluating industrial solar solutions Gujarat and similarly scaled deployments, procurement decisions made on upfront module cost alone without accounting for degradation trajectory and lifetime yield tend to look worse as the asset ages. For cost-sensitive residential installations where upfront budget is the primary constraint, Mono PERC still holds a practical case.
What Investment Patterns Are Saying
Market transitions are often announced before they’ve happened. In this case, manufacturing investment confirms what procurement trends suggest.
Across India, solar panel manufacturers in India have been redirecting capital expenditure toward TOPCon production lines rather than expanding PERC capacity. This reflects where order books and technology roadmaps are pointing, and where buyer specifications for new utility-scale and industrial projects are landing.
GREW Solar, a solar company in Gujarat headquartered in Ahmedabad and backed by the Chiripal Group, is among the manufacturers that have built their strategy around N-type TOPCon technology. Its facility in Dudu, Rajasthan, manufactures N-type bifacial TOPCon modules at 6.5 GW of capacity, expanding to 11.0 GW with solar PV cell manufacturing in Narmadapuram, Madhya Pradesh providing upstream integration. That commitment reflects a manufacturing view of where the market is heading, one supported by the global production data.
Does Mono PERC Still Have a Future?
Mono PERC still has a defensible position in residential rooftop projects where upfront cost is the dominant consideration, in weight-constrained installations, and in repowering of existing PERC-based systems. The technology is mature, the supply chain is established, and for standard applications it continues to perform reliably.
But the trajectory is clear. For new utility-scale procurement, for industrial projects where long-term yield drives ROI, and for any application where sustained output over 25 years is the primary measure of value, TOPCon is increasingly the specification of choice, not the premium alternative.
The debate between the two technologies has largely been settled by the market. The more useful question in 2026 is which manufacturer’s TOPCon modules are built with the process control and supply chain integration to deliver on what the technology is actually capable of consistently, across a full project lifetime.
