India Moves Up the Solar Stack: Two New TOPCon Cell Lines Fire Up in a Week

From assembling modules to making cells

India has plenty of solar-module assembly capacity, but it has long depended on imports — overwhelmingly from China — for the solar cells that go inside those modules. That is the harder, more capital-intensive step, and it is where the technology actually lives. In the space of a single week in late June 2026, two Indian manufacturers brought new high-efficiency cell lines online, and one of them placed one of the largest cell-equipment orders the country has seen.

EMMVEE's 1.4 GW line — and a 6 GW follow-on

Bengaluru-based EMMVEE has ramped up a 1.4 GW TOPCon solar cell production line, reporting cell efficiencies of up to 25.4% on M10 wafers, according to reporting on June 24, 2026. TOPCon — Tunnel Oxide Passivated Contact — is the cell architecture that has largely displaced the older PERC design because it converts more sunlight per cell.

The line was equipped by German suppliers centrotherm, RENA Technologies and halm, with process integration and technology transfer from Germany's ISC Konstanz. On the back of the ramp-up, EMMVEE Energy placed a follow-up order with RENA Technologies for equipment to build a further 6 GW of TOPCon cell capacity in India — including RENA's wet-process and texturing systems — in what trade press called one of the largest domestic solar cell-equipment deals to date.

Jupiter International doubles its cell base

Days earlier, on June 23, 2026, Kolkata-headquartered Jupiter International began production at a new 1.25 GW TOPCon solar cell line at its Baddi campus in Himachal Pradesh. The commissioning lifts the company's total cell capacity from 2 GW to 3.25 GW; the same site already houses 2 GW of monocrystalline PERC cell manufacturing. Jupiter has also said it is developing a larger 3 GW cell and 1.5 GW module facility in Nagpur, Maharashtra.

Why cells, not modules, are the real test

A module is mostly assembly — laminating cells, wiring and framing. A cell line is a semiconductor-adjacent process: wafers are textured, diffused, passivated and metallised in tightly controlled wet and thermal steps, and small process gains translate directly into efficiency and yield. The reliance on imported equipment in both of this week's announcements — German texturing, etching and metrology tools — is a reminder that India is still buying the front-end technology even as it builds the capacity at home.

That is the usual path up a manufacturing value chain: install the lines, learn the process, localise the equipment and materials later. Policy is pushing in the same direction. India's Approved List of Models and Manufacturers and its production-linked incentives have been steering demand toward domestically made cells, and high-efficiency TOPCon is where that demand is heading.

The takeaway

Neither EMMVEE's 1.4 GW line nor Jupiter's 1.25 GW unit is, on its own, a national turning point. Taken together — alongside EMMVEE's 6 GW equipment order — they mark a busy week in a structural shift: India trying to make the cells, and not just the modules, behind its fast-growing solar fleet, and edging toward the higher-efficiency TOPCon technology that now defines the global market.

Sources

• https://www.pv-magazine-india.com/2026/06/24/emmvee-ramps-up-1-4-gw-topcon-solar-cell-line-with-german-equipment-places-multi-gw-follow-up-order/
• https://www.pv-magazine.com/2026/06/23/jupiter-international-starts-production-at-1-25-gw-topcon-solar-cell-line-in-himachal-pradesh/
• https://www.rena.com/en/news-events/news/news-details/rena-technologies-secures-major-order-for-6-gw-topcon-solar-cell-production-equipment-in-india-from-emmvee-energy
• https://www.mercomindia.com/rena-secures-6-gw-solar-cell-manufacturing-equipment-order-from-emmvee