Holosolis secures over US$250 million, plans to build French module factory next year

November 18, 2025
Facebook
Twitter
LinkedIn
Reddit
Email
A render of the Holosolis factory.
The Holosolis factory is set to be Europe’s largest solar module plant when it begins operations. Image: Holosolis.

French solar PV module manufacturer Holosolis has secured €220 million (US$255.2 million) in public and private funding to support its construction of a 5GW module manufacturing facility in France.

The latest round of funding comes from French industrial firm Calés Technologie and Swiss cold forming company Forming. These investors join the Armor Group, Groupe IDEC, Heraeus, InnoEnergy and TSE in supporting the manufacturing plant, at which Holosolis expects to begin commercial operations by 2030.

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

Holosolis noted that the latest round of funding would be used to finalise the design of the factory, support recruitment and “supply chain setup” and install tunnel oxide passivated contact (TOPCon) manufacturing equipment.

Building a European solar PV supply chain has been much discussed European solar circles in recent years, and Holosolis CEO Bertrand Lecacheux expressed optimism at the conclusion of the latest fundraising round.

“I am very proud that new partners are joining us! We will be able to benefit from their expertise to build the largest TOPCon cell and module gigafactory in Europe,” Lecacheux said. “Several photovoltaic developers have chosen to invest in the project and we have a total of more than 20GW of customer letters of intent, which demonstrates the strength of our business model.”

Over the summer, Lecacheux was one of several industry experts to speak on a PV Tech panel, hosted at the Intersolar Europe event in Germany, at which he discussed the importance of securing the “strategic segments” of the global solar supply chain in Europe, to reduce reliance on multi-national supply chains. Earlier this year, China’s top four solar manufacturers announced losses of over US$1.5 billion in the first half of this year, and China’s dominance of the global solar supply chain is such that hardships endured by these companies has a knock-on effect on the prices and availability of modules elsewhere in the world.

Holosolis also announced that it has now secured “all the permits” necessary to launch construction of the module factory next year in Sarreguemines-Hambach, eastern France, having secured a building permit in January of this year and signed a TOPCon patent licence agreement with leading Chinese manufacturer Trinasolar in September.

The advancement of Holosolis’ factory is a positive development for European solar as a whole, which has seen a wave of policy support for new manufacturing facilities this year. These include the launch of the International Solar Manufacturing Initiative (ISMI) in March, to accelerate demand for European-made solar products, and the inclusion of support for solar PV manufacturing in the EU’s Net Zero Industry Act (NZIA) in May.

PV Tech publisher Solar Media will host the PV ModuleTech Europe event in Málaga, Spain on 2-3 December. Speakers will discuss trends in European solar, including changes in module technologies, changes in the existing manufacturing process, and ESG compliance. For full details and booking options click here.

25 November 2025
Warsaw, Poland
Large Scale Solar Central and Eastern Europe continues to be the place to leverage a network that has been made over more than 10 years, to build critical partnerships to develop solar projects throughout the region.
2 December 2025
Málaga, Spain
Understanding PV module supply to the European market in 2026. PV ModuleTech Europe 2025 is a two-day conference that tackles these challenges directly, with an agenda that addresses all aspects of module supplier selection; product availability, technology offerings, traceability of supply-chain, factory auditing, module testing and reliability, and company bankability.
9 March 2027
Location To Be Confirmed
PV CellTech Global will gather the key stakeholders from PV manufacturing, equipment/materials, policy-making and strategy, capital equipment investment and all interested downstream channels and third-party entities. Join us in Q1 of 2027

Read Next

November 18, 2025
TOPCon solar modules show signs of accelerated degradation, which undermines the long warranties promised by many manufacturers, according to new findings from German researchers.
November 18, 2025
JinkoSolar shipped just over 20GW of solar PV modules in the third quarter of this year, down sequentially from the previous quarter.
Premium
November 18, 2025
PV Talk: George Touloupas of Intertek CEA explains how the regulatory environment is ratcheting up for the solar supply chain.
November 17, 2025
Spain has allocated up to €200 million (US$232 million) to fund “innovative” renewable energy and energy storage projects.
November 14, 2025
Lightsource bp has started construction on its 330MWp Valle 3 and 4 project in Wamba, Valladolid, in the Castilla y Leon region of Spain. 
November 14, 2025
International solar manufacturer Canadian Solar has posted stable financials in Q3 2025, as its solar module and battery energy storage system (BESS) sales shift.

Upcoming Events

Solar Media Events
November 25, 2025
Warsaw, Poland
Solar Media Events
December 2, 2025
Málaga, Spain
Solar Media Events
February 3, 2026
London, UK
Solar Media Events
March 24, 2026
Lisbon, Portugal
Solar Media Events
June 16, 2026
Napa, USA