Batteriespeicher Westfalen 1
140 MW, 151 MWh (1.1 hours) in Hamm, Nordrhein-Westfalen, registered as operating since 28 December 2024. 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 |
|---|---|---|---|---|---|---|
| Batteriespeicher Westfalen 1 | SEE916532936024 | 140 | 151 | 28 December 2024 | 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 |
|---|---|---|
| RWE Generation SE | Amtsgericht Essen HRB 24353 | Essen, Nordrhein-Westfalen |
Owner. RWE AG, Essen. From the owner’s own publication. Evidence: RWE press release, 14 February 2025: "RWE setzt die Batteriespeicher auf verschiedenen Energiemärkten ein.". Checked 16 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 | RWE (RWE Generation SE) RWE press release, 14 February 2025 |
| Trades its output | Self-marketed: RWE deploys the battery in several energy markets itself RWE press release, 14 February 2025 |
| Built by | RWE in-house: planning, modelling, system integration and commissioning done by RWE itself RWE press release, 31 May 2023 |
| Power, as the owner gives it | 140 MW RWE press release, 14 February 2025 |
| Energy, as the owner gives it | 151 MWh RWE press release, 14 February 2025 |
| In operation, as the owner gives it | In operation since December 2024 (2024-12); RWE announced Hamm and Neurath together as 220 MW / 235 MWh on 2025-02-14 RWE press release, 14 February 2025 |
| Also published | RWE planned about EUR 90 million for Hamm (of about EUR 140 million for Hamm and Neurath); Hamm battery at the Westfalen power station site on 14,000 m2 RWE press release, 31 May 2023 |
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 | Westnetz GmbH |
| Connected at | high voltage (110 kV) |
| Municipality | Hamm |
| State | Nordrhein-Westfalen |
| Permit | Bez.Reg. Arnsberg, Dez.54, 900-0079017-0002/WD-0001 |
| Registered position | 51.6826, 7.9707 |
| Register location | SEL926745834017 |
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 30 December 2024; last changed in the register on 19 February 2025. 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.