ECO POWER ONE
104 MW, 239 MWh (2.3 hours) in Bollingstedt, Schleswig-Holstein, registered as operating since 13 March 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 |
|---|---|---|---|---|---|---|
| ECO POWER ONE CD | SEE922158261037 | 52 | 119 | 13 March 2025 | Lithium | checked |
| ECO POWER ONE AB | SEE925543621515 | 52 | 119 | 13 March 2025 | 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 |
|---|---|---|
| ECO POWER ONE GmbH | Amtsgericht München HRB 277836 | Kirchheim, Bayern |
Owner. Alpiq Holding AG, Switzerland, through Alpiq Energie Deutschland GmbH, Berlin (Amtsgericht Charlottenburg HRB 199794 B), 100 %. Confirmed in the commercial register. Evidence: Shareholder list of ECO POWER ONE GmbH filed 27 August 2026 (Amtsgericht München HRB 277836); sale reported at solarserver.de. Eco Stor sold the company to Alpiq Energie Deutschland GmbH: notarial deed of 4 August 2026, new shareholder list filed 27 August 2026 (Bollingstedt, 103.5 MW) 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 | Alpiq acquired the battery from ECO STOR; release dated 2026-08-25 Alpiq media release, 25 August 2026 |
| Owner, as published | Alpiq Energie Deutschland GmbH buys Bollingstedt from Eco Stor GmbH; Eco Stor stays responsible for technical and operational management solarserver, 26 August 2026 |
| Owner’s parent | Alpiq (Swiss energy group), via Alpiq Energie Deutschland GmbH solarserver, 26 August 2026 |
| Trades its output | enspired optimises ECO POWER ONE in wholesale and ancillary markets (page still describes ECO STOR as owner); not confirmed after the Alpiq sale enspired case study, 10 September 2026 |
| Built by | Built by Eco Stor with project developer EPW ESS News, 6 June 2025 |
| Built by | Eco Stor acted as EPC and developer Energy-Storage.News, 30 April 2024 |
| Power, as the owner gives it | 103.5 MW Alpiq media release, 25 August 2026 |
| Energy, as the owner gives it | 238 (Alpiq); enspired gives 238.5 Alpiq media release, 25 August 2026 |
| In operation, as the owner gives it | In operation since June 2025 (2025-06) per Alpiq Alpiq media release, 25 August 2026 |
| In operation, as the owner gives it | Online since April 2025, official inauguration on Thursday 2025-06-05 ESS News, 6 June 2025 |
| In operation, as the owner gives it | Brought online in July 2025 (2025-07) per Energy-Storage.News; conflicts with Alpiq (June) and ESS News (April) Energy-Storage.News, 26 August 2026 |
| Also published | Eco Stor remains responsible for technical and operational management after the sale solarserver, 26 August 2026 |
| Also published | Cell maker not published: Cell maker not named; LFP chemistry enspired case study, 10 September 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 | Schleswig-Holstein Netz GmbH |
| Connected at | high voltage (110 kV) |
| Municipality | Bollingstedt, district of Schleswig-Flensburg |
| State | Schleswig-Holstein |
| Land parcel | Gammellund, Flur15: 88 |
| Registered position | 54.5773, 9.4740 |
| Register location | SEL925943845900, SEL993942454935 |
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 25 March 2025; last changed in the register on 20 May 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.