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Websol Plans 600 MW Mono-PERC-to-TOPCon Cell Line Transition by FY27 Photograph: (AI)
Websol Energy System plans to upgrade one of its existing 600 MW Mono-PERC solar cell production lines to TOPCon technology, as the company looks to scale up high-efficiency cell manufacturing and strengthen its position in India’s domestic solar market.
The company, in its Q1 FY27 investor presentation, said the brownfield upgrade will add 150 MW of capacity, taking the upgraded line to 750 MW and total cell manufacturing capacity to 1.35 GW. The upgraded line is expected to achieve around 25% cell efficiency. 
Websol has scheduled commercial operation of the upgraded TOPCon line for March 2027. The project involves an estimated investment of about ₹270 crore. Civil work began in March 2026, while equipment ordering and installation commenced in June. Trial runs and validation are scheduled for February-March 2027. 
The transition comes as Websol seeks to move beyond its existing Mono-PERC manufacturing base. Its current 1.2 GW cell capacity operates at more than 90% utilisation, with average cell efficiency of over 23%. The company expects the shift to TOPCon to raise efficiency to around 25%. 
The company also has a 550 MW solar module manufacturing capacity. Websol says its module business is forward-integrated to cater to domestic content requirement (DCR) schemes, including PM-KUSUM and PM Surya Ghar.
The 600 MW line conversion is only the first stage of Websol’s larger technology and capacity expansion strategy. The company is also progressing with a 4 GW greenfield integrated TOPCon cell and module manufacturing facility, which is planned to be developed in phases.
The company has described the expansion as a three-part programme comprising the brownfield TOPCon upgrade, a phased greenfield integrated cell-and-module facility and eventual backward integration into ingot and wafer manufacturing. Websol has said the integrated facility is intended to benefit from economies of scale and reduce production costs, while localising more of the supply chain. 
Websol is also exploring an ingot and wafer facility through a partnership with Linton Crystal for equipment and technology support. The company said greater backward integration would reduce dependence on imported wafers and strengthen control over the domestic value chain. 
The company’s technology roadmap envisages a rapid increase in the share of TOPCon in its manufacturing base. According to its investor presentation, TOPCon is expected to account for about 88% of Websol’s cell capacity by FY28. 
Websol’s production numbers also indicate stronger utilisation of its existing manufacturing assets. Cell production increased from 126 MW in Q1 FY26 to 259 MW in Q1 FY27, while cell capacity utilisation stood at 92%. Module production rose from 50 MW to 103 MW over the same period, with module capacity utilisation increasing from 39% to 81%. 
The company closed Q1 FY27 with an order book of ₹1,278 crore, up from ₹1,161 crore at the end of Q4 FY26. During the quarter, Websol executed orders worth ₹373 crore and received new orders worth ₹490 crore. Solar cells accounted for ₹665 crore, or 52%, of the closing order book, while modules accounted for ₹613 crore, or 48%. 
This provides visibility for both sides of Websol’s manufacturing business as it transitions toward higher-efficiency technology.
Websol’s expansion is being positioned around the growing domestic market for high-efficiency and domestically manufactured solar products. The company is an ALMM-approved solar cell manufacturer and says it is supplying cells for schemes including PM Surya Ghar and PM-KUSUM. 
Alongside its core cell and module operations, Websol is also developing flexible modules and has launched solar kits for different applications, which it expects to expand its addressable market and customer base. 
Managing Director Sohan Lal Agarwal said the company’s focus for FY27 is on technology-led scaling, with high-efficiency TOPCon integration forming a key part of its strategy. He also pointed to the company’s order book and alignment with government schemes as drivers for the next phase of growth. 
With the planned 600 MW Mono-PERC-to-TOPCon conversion, a 4 GW integrated TOPCon pipeline and growing cell and module utilisation, Websol is positioning FY27 as a transition year from capacity expansion based on its existing technology towards a larger high-efficiency manufacturing platform.
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