India’s rapid build-out of solar cell manufacturing capacity is pushing the industry into its next phase, where the focus is shifting from installed gigawatts to commercial output, production yields and the ability to manufacture high-efficiency cells consistently at scale.
Domestic cell manufacturing capacity has expanded from roughly 13 GW in July 2025 to around 36 GW in 2026. Capacity enlisted under the Approved List of Models and Manufacturers (ALMM) List-II has also crossed 35 GW, reflecting the speed at which manufacturers are commissioning new facilities.
But nameplate capacity does not necessarily represent commercially available output.
New cell lines typically undergo commissioning, equipment stabilisation, qualification, process optimisation and yield improvement before reaching steady-state production. With several Indian facilities still moving through this ramp-up cycle, actual utilisation varies considerably across manufacturers.
Plant-level production and utilisation data are also not disclosed consistently, making it difficult to establish a reliable industry-wide utilisation rate.
Industry data for August showed production of around 2.9 GW against approximately 35.5 GW of ALMM-listed cell capacity. Annualising a single month would suggest production approaching the industry's listed capacity, but such an extrapolation does not establish sustained annual utilisation, particularly as newly commissioned lines continue to stabilise.
Yield Becomes The Next Benchmark
The expansion of capacity is also putting greater attention on production yield — the proportion of cells coming off a manufacturing line that meet the required efficiency and quality specifications.
There is currently no consistently disclosed industry-wide figure for Indian cell manufacturing yields. Performance differs according to technology, equipment configuration, process maturity and how long individual plants have been operating.
For manufacturers, achieving a target efficiency during qualification is only the first step. Commercial competitiveness depends on reproducing that performance across millions of cells while limiting breakage, rejection and material losses.
“A manufacturer may achieve the targeted cell efficiency or yield during qualification, but sustaining it across millions of cells and over continuous production cycles is a different challenge,” said Setul Shah, Director, Mecpower Solutions Limited.
That distinction becomes particularly important as Indian manufacturers attempt to compete with established global production bases that have spent years refining process controls, automation, material utilisation and manufacturing yields.
Efficiency alone, therefore, provides an incomplete measure of manufacturing performance. Grade-A yield, throughput, equipment uptime, rejection rates, reliability and cost per watt collectively determine whether a cell line is commercially competitive.
TOPCon Push Raises The Complexity
The manufacturing challenge is increasing alongside India’s transition towards newer cell technologies.
TOPCon has emerged as the dominant technology in much of the country's upcoming manufacturing pipeline, while manufacturers are also beginning to develop HJT capabilities.
Both require tighter process control than simply achieving high efficiency during testing.
Wafer quality, deposition uniformity, passivation, metallisation, firing, temperature management and contamination control can influence the efficiency and reliability of the final cell. Small variations across these processes become commercially significant when production runs into millions of cells.
TOPCon is further along in commercial scale-up in India, while HJT remains at an earlier stage of manufacturing development. As production expands, manufacturers will need to improve equipment integration, throughput and process stability while simultaneously bringing down costs.
The critical benchmark will consequently be repeatability rather than peak efficiency: whether factories can maintain high median efficiencies and Grade-A yields across sustained production.
For downstream developers, this consistency also has implications beyond manufacturing economics. Cells ultimately go into solar projects expected to generate electricity for more than two decades, making degradation, reliability and long-term performance important alongside headline conversion efficiency.
India’s Upstream Gap Remains
India’s manufacturing expansion is also heavily skewed towards the downstream end of the solar value chain.
Module manufacturing capacity stood at roughly 262 GW by September 2026, compared with around 36.6 GW of cell capacity. Domestic wafer manufacturing remains much smaller, while the country continues to depend substantially on imported wafers, manufacturing equipment, materials and process expertise.
This imbalance means adding cell capacity alone will not create a fully integrated domestic manufacturing ecosystem.
The next phase of localisation will have to extend into ingots, wafers, equipment, consumables and eventually polysilicon, while domestic manufacturers simultaneously develop greater process-engineering capabilities.
The government is already pushing localisation further upstream. Ingots and wafers are set to come under ALMM List-III from June 2028, creating another policy incentive for companies to invest beyond modules and cells.
Several manufacturers are consequently looking at integrated cell, ingot and wafer capacity as the industry prepares for the new requirements.
Cost Competitiveness Is The Harder Test
Building upstream capacity, however, addresses only one part of the competitiveness challenge.
Manufacturing costs in India remain higher than in established global manufacturing hubs such as China, where producers benefit from enormous scale, mature supply chains, extensive upstream integration and years of accumulated process expertise.
Closing that gap will depend on higher factory utilisation, automation, better yields, lower material consumption and localisation of equipment and inputs.
Process knowledge will be particularly important. Imported manufacturing equipment can accelerate capacity creation, but sustained competitiveness requires manufacturers to develop the engineering capability to optimise those machines, improve yields and adapt production processes independently.
That will require greater investment in R&D and skilled technical manpower, alongside collaboration between manufacturers, equipment suppliers, research institutions and academia.
Affordable financing and reliable power will also influence manufacturing economics as the industry moves towards increasingly capital-intensive cell technologies.
India’s solar manufacturing push has so far been defined largely by the speed at which new capacity has been announced and commissioned. The next stage will be harder to capture through headline gigawatt numbers.
The metrics that increasingly matter will be how much of that capacity operates consistently, how many cells meet Grade-A specifications, how efficiently manufacturers use materials and equipment, and how close their cost per watt comes to established global competitors.
India has built manufacturing scale. Turning that scale into manufacturing depth is now the bigger test.
Keywords: India solar manufacturing, solar cells, ALMM List-II, solar cell capacity, TOPCon, HJT, solar cell yields, manufacturing utilisation, solar manufacturing India, ingots, wafers, ALMM List-III, solar manufacturing costs