Vikram Solar Says Its 9 GW TOPCon Cell Plant at Gangaikondan Will Make Its First Cells in December

Vikram Solar says its 9 GW N-type TOPCon solar cell factory at the SIPCOT industrial park in Gangaikondan, Tamil Nadu, is on schedule to produce its first cells in December 2026. The update, published on 23 October, marks a key point in the company's plan to move from assembling modules to making the photovoltaic cells inside them. That is the step where Indian manufacturing has so far depended most on imports.

What the company announced

• Plant: a 9 GW N-type TOPCon (Tunnel Oxide Passivated Contact) cell line at SIPCOT Gangaikondan.
• Timeline: first cells in December 2026, with the full 9 GW to be commissioned in phases after that.
• Developer: the plant is being built by VSL Green Power Private Limited, a wholly owned subsidiary, on an integrated campus of nearly 200 acres.
• Expansion: cell capacity at the site is planned to grow to 12 GW.
• Certification: Vikram Solar says it will apply, "in due course", for the cells to be listed under List-II of the Approved List of Models and Manufacturers (ALMM), the government's register of approved domestic cell makers.
• Use: at full capacity the plant will supply high-efficiency TOPCon cells for most of Vikram Solar's own module production.

Chairman and Managing Director Gyanesh Chaudhary said cells are where the value, the technology and the risk in a module sit, "and in December we start making them here." He called it the most important step in the company's integration journey, "and not the last."

Three phases on one campus

The cell plant is the second of three planned phases at Gangaikondan:

1. Modules (done): a 6 GW module plant, opened by the Tamil Nadu Chief Minister in August 2026.
2. Cells (under way): the 9 GW TOPCon line, with first output in December.
3. Ingots and wafers (approved): a 9 GW ingot and wafer facility that has board approval and is targeted for FY29.

When all three are complete, the campus would make most of the solar value chain, from silicon ingot to finished panel, on one site. Polysilicon would still come from outside.

Why cells matter so much

India has added solar module capacity quickly over the past few years, encouraged by the ALMM, import duties and the production-linked incentive (PLI) scheme for high-efficiency modules. But the module is the simplest part of the chain. Cells are where most of the technology and the efficiency gains are, and until recently most Indian module makers imported them, mainly from China.

Policy is now targeting that gap. ALMM List-II, which covers cells, is intended to require domestically made cells in government-backed projects, just as List-I did for modules. Programmes such as PM Surya Ghar (rooftop solar) and PM-KUSUM (farm solar) already require domestic content. Vikram Solar says its cells will support supply to these programmes, which is why List-II enlistment matters commercially.

The technology choice also matters. N-type TOPCon has replaced older p-type PERC as the main mass-market cell architecture worldwide because it converts more sunlight into electricity and loses less performance over time. A new Indian line built on TOPCon starts with the current mainstream technology rather than one that is being phased out.

What TOPCon actually changes

A solar cell is a thin wafer of silicon treated so that sunlight knocks electrons loose and metal contacts collect them as current. Much of a cell's efficiency is lost at those contacts, where electrons and holes recombine before they can be collected. TOPCon tackles this by adding an ultra-thin layer of silicon oxide, only a nanometre or two thick, topped with doped polysilicon at the rear of the cell. The layer lets current pass while "passivating" the surface so fewer charge carriers are lost. Built on n-type wafers, which degrade less in sunlight than the older p-type wafers, TOPCon cells convert a larger share of sunlight and hold their output better over a panel's 25–30-year life.

Making TOPCon cells means running high-temperature diffusion furnaces, deposition tools and precise screen-printing lines with tight process control. These are skills Indian industry has only recently started to build at gigawatt scale, so each new line also adds to the country's manufacturing know-how.

Where this fits in India's solar push

Vikram Solar is one of several Indian manufacturers racing to add cell capacity. Premier Energies, Avaada, Tata Power's TP Solar and others have commissioned or ramped up TOPCon and other cell lines this year, and the Finance Ministry has cleared a support scheme for polysilicon in principle. Together these moves aim to make India's solar supply chain resilient against trade disruptions and less dependent on a single foreign supplier for its energy transition.

Vikram Solar has also set up a separate subsidiary, VSL PowerHive, for battery-energy-storage manufacturing near Chennai. That is a sign that the company sees solar generation and storage as linked businesses.

Caveats

December is a target. The announcement is a company statement, and no independent party has yet confirmed that the line is producing cells. Cell factories are harder to start up than module lines. The first months after start-up usually involve tuning production yields and efficiency, and a plant's nameplate capacity is not the same as its actual output. ALMM List-II enlistment has not yet been sought. The ingot-and-wafer stage, which would add the most value, is still about three years away.

Why it matters beyond India

If Indian manufacturers can make TOPCon cells at scale and at competitive cost, India becomes a credible alternative supplier for buyers in the US, Europe and elsewhere who want solar supply chains that do not depend entirely on China. Vikram Solar's December milestone is one company's contribution to that, but it is a necessary step towards India making its own solar cells rather than only assembling panels from imported ones.

Sources

• https://www.equitybulls.com/news/377534/vikram-solar-readies-9-gw-topcon-cell-plant-at-gangaikondan-first-made-in-india
• https://www.dailyexcelsior.com/vikram-solar-to-roll-out-first-cells-from-9-gw-tamil-nadu-facility-in-dec-2026
• https://powerpeakdigest.com/vikram-solar-9gw-topcon-cell-plant-tamil-nadu/
• https://www.indianweb2.com/2026/10/vikram-solar-set-to-produce-first-made.html
• https://startuptalky.com/news/vikram-solar-set-to-launch-cell-production/
• https://www.vikramsolar.com/press-releases/honble-chief-minister-of-tamil-nadu-thiru-c-joseph-vijay-inaugurated-vikram-solars-6-gw-solar-pv-module-manufacturing-plant-at-gangaikondan/