BESS Arzberg
101 MW, 198 MWh (2 hours) in Arzberg, Bayern, registered as operating since 7 April 2025. 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 two units.
| Unit | Register number | MW | MWh | Commissioned | Battery | Grid operator check |
|---|---|---|---|---|---|---|
| BESS - DE - ARZBERG - GMRO | SEE909908219982 | 50 | 99 | 7 April 2025 | Lithium | under check |
| BESS - DE - ARZBERG - GMRW | SEE971815239520 | 50 | 99 | 1 December 2025 | 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 |
|---|---|---|
| MW Storage NOB GmbH | Amtsgericht Hof HRB 6769 | Wunsiedel, Bayern |
Owner. MW Storage AG, Switzerland, with its MW Storage Fund and Reichmuth Infrastructure; Bayernwerk and ZukunftsEnergie Nordostbayern also invested. From the owner’s own publication. Evidence: Bayernwerk press release of 10 November 2024 on the Arzberg battery and its investors; shareholder list not read. 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 | MW Storage Fund with majority shareholder Reichmuth Infrastructure as anchor investors; Bayernwerk and ZENOB also invested Bayernwerk press release, 10 November 2024 |
| Owner’s parent | Bayernwerk (minority investor) is a 100% subsidiary of E.ON Bayernwerk press release, 10 November 2024 |
| Owner’s parent | MW Storage Fund is mainly backed by Reichmuth Infrastructure and MW Storage; Bayernwerk and ZENOB are minority investors Energy-Storage.News, 17 March 2025 |
| Trades its output | Entrix commercialises 50 MW / 100 MWh, half the plant; MW Storage has not said who markets the other half; toll or merchant not disclosed Energy-Storage.News, 17 March 2025 |
| Built by | Fluence Energy GmbH selected to deliver the project Fluence press release, 14 February 2024 |
| Battery system | Fluence Fluence press release, 14 February 2024 |
| Power, as the owner gives it | 100 MW Bayernwerk press release, 10 November 2024 |
| Energy, as the owner gives it | 200 MWh Bayernwerk press release, 10 November 2024 |
| In operation, as the owner gives it | 2024-11-08 official inauguration (register first commissioning date is 2025-04-07) Bayernwerk press release, 10 November 2024 |
| In operation, as the owner gives it | Due to be commissioned in April 2025 (2025-04), per Energy-Storage.News in March 2025 Energy-Storage.News, 17 March 2025 |
| In operation, as the owner gives it | 2024-11-08 official inauguration ESS News |
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 | Bayernwerk Netz GmbH |
| Connected at | high voltage (110 kV) |
| Municipality | Arzberg, district of Wunsiedel i. Fichtelgebirge |
| State | Bayern |
| Permit | Landratsamt Wunsiedel im Fichtelgebirge, 41–253/2023; Landratsamt Wunsiedel im Fichtelgebirge, 43-632/00 |
| Registered position | 50.0565, 12.1430 |
| Register location | SEL915834154051, SEL952548315668 |
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 17 November 2025; last changed in the register on 26 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.