BESS Wetzen
56 MW, 112 MWh (2 hours) in Oldendorf (Luhe), Niedersachsen, registered as operating since 5 August 2026. Everything on this page is read from Germany’s register of power units and the other published records named beside each fact.
What it is
The register holds this battery as one unit.
| Unit | Register number | MW | MWh | Commissioned | Battery | Grid operator check |
|---|---|---|---|---|---|---|
| BESS Wetzen | SEE903925095949 | 56 | 112 | 5 August 2026 | Lithium | under check |
Power is the net power the operator registered, the most the unit may feed into the grid. Energy is the usable capacity of the unit’s installation. A grid operator check marked “checked” means the grid company has confirmed the entry; “under check” means it has not yet. On the large sites we compared, the register’s commissioning date often came months before the owner’s announced start, which suggests it records first energisation.
Who runs it and who owns it
| Operator in the register | Commercial register entry, as the operator gave it | Seat |
|---|---|---|
| BESS Wetzen | Amtsgericht Hamburg HRA 128260 | Hamburg, Hamburg |
Owner. Achmea IM Climate Infrastructure Fund 49 % and One Planet Investment S.à r.l., Luxembourg 51 %; Aquila says a fund it manages owns the plant, through Achmea IM Climate Infrastructure Fund HoldCo 1 B.V., Zeist, Netherlands (liability amount 1,470 euros, 49 %); One Planet Investment S.à r.l., Wecker, Luxembourg (B282970; 1,530 euros, 51 %). Confirmed in the commercial register. Evidence: Current printout (AD) of Amtsgericht Hamburg HRA 128260, retrieved 11 October 2026; last entry 9 December 2024. Limited partners as entered on 9 December 2024 Checked 11 October 2026. Every battery of this family.
The register names the operator, the company that runs the unit. The owner behind it comes from the commercial register (Handelsregister) or the owner’s own publication, as marked. The register number is the one the operator typed in; on 11 October 2026 we found it wrong or missing for 26 of the companies we looked up.
Who trades it and what it is built from
| Owner, as published | A fund managed by Aquila Capital owns the project (Aquila Clean Energy developer) pv magazine Deutschland, 8 June 2026 |
| Trades its output | Entrix, full-stack optimisation (FCR, aFRR, day-ahead, wholesale); term not stated Energy-Storage.News, 20 November 2024 |
| Contract | No toll mentioned; ING Deutschland gave EUR 26 million of fully merchant debt pv magazine Deutschland, 8 June 2026 |
| Built by | H&MV Engineering as BOP contractor (Trina release covering both Strübbel and Wetzen) Trina Storage press release, 21 November 2024 |
| Battery system | Trina Storage supplies and integrates the BESS Energy-Storage.News, 20 November 2024 |
| Battery system | Trina Storage, complete BESS based on Elementa, 18-year service agreement Trina Storage press release, 21 November 2024 |
| Power, as the owner gives it | 56 MW pv magazine Deutschland, 8 June 2026 |
| Energy, as the owner gives it | 112 MWh pv magazine Deutschland, 8 June 2026 |
| In operation, as the owner gives it | Start of 2026 originally planned; at 2026-06-08 still being taken towards commercial operation (register 2026-08-05) pv magazine Deutschland, 8 June 2026 |
From published documents: the owners’, builders’ and optimisers’ own announcements and the trade press, each linked. Where the owner’s power or energy differs from the register’s, both are shown and every figure on this site uses the register’s.
Where it connects
| Grid company | Avacon Netz GmbH |
| Connected at | high voltage (110 kV) |
| Municipality | Oldendorf (Luhe), district of Lüneburg |
| State | Niedersachsen |
| Registered position | 53.1678, 10.2459 |
| Register location | SEL933060465659 |
As registered. The grid company and voltage come from the register’s public unit table; the position is the one the operator registered. See it on the Atlas.
What has changed in the register
First registered on 15 September 2026; last changed in the register on 15 September 2026. No change has shown in our reads since the first, on 10 October 2026.
What this page cannot show
Germany publishes no battery’s metered output. On 11 October 2026 we checked the four public sources that might carry it: the ENTSO-E Transparency Platform, SMARD, the yearly EEG data and the transmission companies’ redispatch records. None gives the output of any German battery, one by one or as a fleet. So this page cannot say what the battery exported, imported or earned, as Britain’s battery pages do.
Sources: Marktstammdatenregister, Bundesnetzagentur, Datenlizenz Deutschland, Namensnennung 2.0: the full export of 15 October 2026 and the public unit table of 15 October 2026. Company details from the register’s market actor table. Owners from the commercial register and the owners’ publications, as marked. Tender awards from the Bundesnetzagentur’s award lists.