⚡ Quick Read
Websol Energy System, a key player in the Indian solar manufacturing landscape, has announced a strategic transition toward advanced photovoltaic technologies. The company is currently upgrading its existing monocrystalline PERC cell production lines to high-efficiency TOPCon (Tunnel Oxide Passivated Contact) technology. This move aligns with the global industry shift toward TOPCon as the new standard for crystalline silicon solar cells, driven by the need for higher conversion efficiencies in utility-scale and commercial solar projects.
The upgrade project involves converting a 600 MW mono PERC line into a 750 MW TOPCon line at the company’s existing manufacturing facility. This expansion will boost Websol’s total cell manufacturing capacity from 1.2 GW to approximately 1.35 GW, with TOPCon technology expected to account for 55% of the total output upon completion in March 2027. The upgraded lines are projected to achieve cell efficiency levels of approximately 25%.
A critical component of this transition is the optimization of material costs. TOPCon cells traditionally require higher silver consumption compared to PERC, making manufacturers vulnerable to price fluctuations. Websol reported a 20% reduction in silver consumption during the 2025-26 financial year and is targeting an additional 10% reduction. Furthermore, the company is exploring alternative metallization pathways to minimize long-term reliance on silver.
Beyond the current upgrade, Websol is planning a significant 4 GW integrated cell and module manufacturing facility. The company intends to develop this project in phases to mitigate risks associated with rapid technological evolution. Websol has identified West Bengal as the preferred location, citing the state’s improving industrial policy and the benefits of leveraging an established supply base and skilled workforce near its existing operations. Additionally, the company has secured a partnership with Linton Crystal Technologies to support its greenfield ingot and wafer manufacturing ambitions.
For EPC contractors and solar developers in India, the domestic availability of high-efficiency TOPCon cells is a positive development. As project developers face increasing pressure to maximize energy yield within limited land footprints, the adoption of 25% efficiency cells allows for higher power density. Furthermore, Websol’s focus on reducing silver consumption suggests a commitment to cost-competitiveness, which may translate into more stable module pricing for large-scale procurement contracts.
The successful execution of the 750 MW TOPCon upgrade by March 2027 will serve as a benchmark for Websol’s larger 4 GW integrated manufacturing roadmap. As the Indian renewable energy sector continues to scale toward ambitious capacity targets, the localization of the upstream supply chain—specifically ingot and wafer manufacturing—remains a vital pillar for ensuring energy security and reducing dependence on imported components.
Aditya Pathre is the Founder of MVApulse and covers India’s renewable energy sector, including solar, wind, battery energy storage systems (BESS), green hydrogen, transmission infrastructure, renewable energy policy and competitive bidding. His reporting focuses on project developments, market trends, government policies and energy transition across India.
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