By Razvan Toma · Founder & CEO, Ampervia · Last checked 2026-10-13 · Sources linked below
German developer Aventos bought the former OSRAM glassworks in Berlin-Siemensstadt in 2021 in a sale-leaseback, secured the power supply contract for a data center with an on-site substation planned, and in December 2025 sold the data center plot to Tristan Capital Partners’ EPISO 6 fund. The plot is planned for up to 63 MW across three buildings. Terms were not disclosed. 
DCD
Timeline
| When | What happened |
|---|---|
| 1927 | Glassworks built for OSRAM light-bulb production. |
| 2021 | Aventos acquires the site in a sale-leaseback; plans the Luxwerk business park. |
| 2025 | Power supply contract secured for the data center part; on-site substation planned. |
| Dec 2025 | Data center plot sold to Tristan Capital Partners (EPISO 6); terms not disclosed. |
What changed between entry and exit
- Split the data center plot from a wider redevelopment.
- Secured the power contract, described by the seller as the crucial milestone in the value chain.
- Sold to an institutional fund rather than building.
Capital and counterparties
Aventos (developer) to the power milestone; Tristan Capital Partners’ opportunistic fund for the next stage.
Economics: confirmed and not disclosed
| Item | Figure | Note |
|---|---|---|
| Entry price (2021) | Not disclosed | Sale-leaseback |
| Exit price (2025) | Not disclosed | |
| Planned capacity | Up to 63 MW | Three three-storey buildings |
Risks and limitations
- No prices are public.
- Berlin allocates large connections through an annual procedure; a contract already in hand is what made the plot sellable.
Relevance to Ampervia
In a rationed grid like Berlin’s, the power contract is the asset. An institutional fund bought at that milestone, before any building.
Sources
Last checked 2026-10-13. Third-party precedent, not an Ampervia project.