Großbatteriespeicher Alfeld
99 MW, 203 MWh (2 hours) in Alfeld (Leine), Niedersachsen, registered as operating since 1 June 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 |
|---|---|---|---|---|---|---|
| Großbatteriespeicher Alfeld | SEE918385807070 | 99 | 203 | 1 June 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 |
|---|---|---|
| Scale Alfeld GmbH ＆ Co. KG | none given | München, Bayern |
Owner. Scale Storage Alfeld ApS, Denmark (the Scale fund that Kyon names as its partner); Obton still provides the general partner, through Scale Storage Alfeld ApS, Aarhus, Denmark (CVR 43539884), sole limited partner. Confirmed in the commercial register. Evidence: Current printout (AD) of Amtsgericht Flensburg HRA 10959, retrieved 11 October 2026, last entry 7 August 2026; former names Obton Storage 2 GmbH & Co. KG and Obton Alfeld GmbH & Co. KG. Developed by Kyon; bought by Obton in 2023 as Obton Storage 2, then Obton Alfeld GmbH & Co. KG; renamed Scale Alfeld GmbH & Co. KG with a Scale company as limited partner (register entry of 7 August 2026) 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 | Kyon Energy sold the Alfeld project to Danish company Obton in 2023 (with Tangermünde and Karstädt) solarserver, 4 December 2023 |
| Owner, as published | Kyon cooperates with Scale Fund, a Danish fund founded in 2023 that invests only in BESS; Alfeld is the fund main activity pv magazine Deutschland, 29 January 2026 |
| Owner, as published | Obton described as investor in Alfeld enspired press release, 19 December 2024 |
| Trades its output | enspired handles cross-market optimisation; Entelios aggregates and trades flexibility (with Tangermünde and Karstädt) enspired press release, 19 December 2024 |
| Built by | Kyon Energy developed and built Alfeld enspired press release, 19 December 2024 |
| Battery system | Nidec Conversion: engineering, supply and commissioning of its containerised water-cooled ACBox battery system Nidec Conversion press release (pv magazine company news), 19 February 2025 |
| Power, as the owner gives it | 137.5 (register holds 99.3 MW) pv magazine Deutschland, 29 January 2026 |
| Energy, as the owner gives it | 282 (register holds 203.1 MWh) pv magazine Deutschland, 29 January 2026 |
| Energy, as the owner gives it | 282 at the 110 kV point of connection Nidec Conversion press release (pv magazine company news), 19 February 2025 |
| Energy, as the owner gives it | 306 (enspired, December 2024) enspired press release, 19 December 2024 |
| Energy, as the owner gives it | 275 (at the 2023 sale to Obton) solarserver, 4 December 2023 |
| In operation, as the owner gives it | Grid connected to the Avacon 110 kV substation by 2026-01-29; commercial operation planned for August 2026 pv magazine Deutschland, 29 January 2026 |
| Also published | Developer Kyon Energy belongs to TotalEnergies pv magazine Deutschland, 29 January 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 | Alfeld (Leine), district of Hildesheim |
| State | Niedersachsen |
| Registered position | 52.0006, 9.7963 |
| Register location | SEL923389775539 |
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 June 2026; last changed in the register on 6 August 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.