🏆 Deal of the Week · CW 47/2025
HoloSolis raised EUR 220 million in a venture funding round; the company's valuation remains undisclosed. The round was backed by new investors Calés Technologie and Forming, alongside a strong base of existing investors. The capital will support the construction of one of Europe's largest solar manufacturing plants.
HoloSolis — key deal facts
| Company | HoloSolis |
| Founded | 2023 |
| Headquarters | Grenoble, France |
| Amount raised | EUR 220m |
| Valuation | Valuation Remains Undisclosed |
| Round | Venture – Series Unknown |
| Investors | Backed by Calés Technologie and Forming, and a solid base of long-standing investors including InnoEnergy, TSE, Groupe IDEC, Armor Group, and Heraeus |
| Sectors | Renewable Energy |
Who invested in HoloSolis?
The round was backed by Calés Technologie and Forming as new entrants, with continued support from long-standing investors InnoEnergy, TSE, Groupe IDEC, Armor Group, and Heraeus. The investor mix is notable for combining deep cleantech institutional backing — anchored by EIT InnoEnergy, an EU-supported entity — with industrial and materials-sector players such as Heraeus and Armor Group. This breadth of strategic capital reflects both the scale of the manufacturing ambition and the broader European push for sovereign solar supply chains.
What does HoloSolis do?
HoloSolis is a French renewable energy company founded in 2023, headquartered in Grenoble, France. The company manufactures low-carbon n-type TOPCon photovoltaic solar cells and modules targeting residential, commercial, and agrivoltaic applications. Its planned production facility is designed to reach 5 GW of annual capacity, equivalent to approximately 10 million modules per year, positioning it as one of the largest solar manufacturing operations in Europe. The company was incubated within the EIT InnoEnergy ecosystem and is led by CEO Jan Jacob Boom-Wichers.
HoloSolis valuation & multiples
No verified multiples data was provided for this transaction. Once revenue and EBITDA figures become publicly available, EV/Sales and EV/EBITDA benchmarks can be applied against comparable European solar manufacturing peers. Explore current sector valuation ranges on the Venionaire DealMatrix Renewable Energy multiples pages.
Frequently asked questions
How much did HoloSolis raise in its Venture – Series Unknown?
HoloSolis raised EUR 220 million in a Venture – Series Unknown funding round; the precise closing month has not been publicly confirmed.
What is HoloSolis's valuation?
HoloSolis's valuation remains undisclosed in connection with this funding round.
Who invested in HoloSolis?
The round was backed by Calés Technologie and Forming as new investors, alongside existing investors InnoEnergy, TSE, Groupe IDEC, Armor Group, and Heraeus.
When was HoloSolis founded and where is it based?
HoloSolis was founded in 2023 and is headquartered in Grenoble, France.
Source: original announcement — read the full report.