Indian solar manufacturer Websol Energy System has started upgrading one of its existing monocrystalline PERC cell lines to TOPCon technology, with the project expected to be completed by March 2027.
The company is converting a 600 MW mono PERC line into a 750 MW TOPCon line at its existing facility. The upgrade will increase Websol’s total cell manufacturing capacity from 1.2 GW to approximately 1.35 GW. Once completed, TOPCon will account for around 55% of the company’s cell capacity.
The upgraded line is expected to achieve a cell efficiency of around 25%.
Websol is also targeting further reductions in silver consumption as it transitions to TOPCon technology. TOPCon cells, which currently dominate global crystalline silicon production, consume more silver than earlier technologies such as PERC, making them particularly sensitive to price volatility.
The company said it reduced silver consumption by 20% in the 2025-26 financial year and is targeting a further 10% reduction. Over the longer term, Websol is evaluating alternative metallization pathways to reduce its reliance on silver.
The company is also planning a 4 GW integrated cell and module manufacturing facility, to be developed in phases to mitigate the risk of technology changes as the solar industry evolves.
The company plans to locate the expansion close to its existing operations in West Bengal, to benefit from easy access to an established supply base and skilled workforce and potentially shorten the time required to bring new capacity online.
“Recent direction of the state [West Bengal] towards greater industrialization, including the proposed new industrial policy, simpler access to industrial land and a stronger focus on attracting manufacturing investment is encouraging for companies like ours, which already have an operating base here. So, we look at West Bengal not merely as the location of our existing plant but as a natural place to consider for the capacity we build next,” stated the company.
Websol has partnered with Linton Crystal Technologies for equipment and technology support for its planned greenfield ingot and wafer manufacturing facility.
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