Allgäuer Überlandwerk batteries at Au
25 MW, 20 MWh (0.8 hours) in Sulzberg, Bayern, registered as operating since 31 July 2018. 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 three units.
| Unit | Register number | MW | MWh | Commissioned | Battery | Grid operator check |
|---|---|---|---|---|---|---|
| Hybridspeicher AU | SEE900291433160 | 16 | 8.5 | 31 July 2018 | Lithium | checked |
| ECOspeicher Au | SEE906917494423 | 6.9 | 8.0 | 13 December 2022 | Lithium | checked |
| NUKAspeicher | SEE916041421592 | 1.7 | 3.5 | 30 January 2024 | Lithium | checked |
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 |
|---|---|---|
| Allgäuer Überlandwerk GmbH | Amtsgericht Kempten (Allgäu) HRB 435 | Kempten, Bayern |
Owner. Allgäuer Überlandwerk GmbH (its own owners not checked). Reported in the trade press and not yet confirmed by the owner or the commercial register. Evidence: solarserver, 14 June 2019: "auf dem Gelände der Allgäuer Überlandwerk GmbH (AÜW) in Sulzberg bei Kempten". 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 | Allgäuer Überlandwerk (AÜW), on its site in Sulzberg near Kempten solarserver, 14 June 2019 |
| Built by | System supplier Smart Power GmbH & Co. KG (Feldkirchen near Munich) solarserver, 14 June 2019 |
| Battery system | Sungrow Samsung SDI Energy Storage Power Supply Co., Ltd. (battery and inverter) solarserver, 14 June 2019 |
| Power, as the owner gives it | 16 for Hybridspeicher AU (register groups 24.6 MW across three units) solarserver, 14 June 2019 |
| Energy, as the owner gives it | 8.5 for Hybridspeicher AU (register groups 20.1 MWh across three units) solarserver, 14 June 2019 |
| In operation, as the owner gives it | Built and commissioned in August 2018 (2018-08) solarserver, 14 June 2019 |
| Also published | Battery is coupled with a gas turbine as a hybrid plant for primary control reserve solarserver, 14 June 2019 |
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 | AllgäuNetz GmbH ＆ Co. KG |
| Connected at | medium voltage |
| Municipality | Sulzberg, district of Oberallgäu |
| State | Bayern |
| Registered position | 47.6855, 10.3221 |
| Register location | SEL905749208932, SEL922749645680 |
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 16 December 2019; last changed in the register on 1 October 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.