SMAREG4 Wartburgspeicher Eisenach
60 MW, 67 MWh (1.1 hours) in Eisenach, Thüringen, registered as operating since 30 November 2022. 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 |
|---|---|---|---|---|---|---|
| SMAREG4 Wartburgspeicher Eisenach | SEE954649497618 | 60 | 67 | 30 November 2022 | 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 |
|---|---|---|
| SMAREG 4 GmbH ＆ Co. KG | Amtsgericht München HRA 112302 | Feldkirchen, Bayern |
Owner. Infrastructure funds managed by B Capital Partners AG, Zurich (BCP Battery Holding platform), through Battery Holding 1 GmbH & Co. KG, Berlin (Amtsgericht Charlottenburg HRA 59799 B), whose limited partner is BCP Battery Holding S.à r.l., Luxembourg (B265742). Confirmed in the commercial register. Evidence: Current printout (AD) of Amtsgericht München HRA 112302, retrieved 11 October 2026, last entry 11 March 2024; printout of Battery Holding 1 GmbH & Co. KG (Charlottenburg HRA 59799 B); platform described at bakermckenzie.com. Developed by Smart Power, now held by Battery Holding 1 GmbH & Co. KG (register entry of 11 March 2024) 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 | Smart Power named as developer and operator in 2022 pv magazine Deutschland, 26 September 2022 |
| Battery system | SMA: 20 turnkey system solutions with Sunny Central Storage battery inverters and medium-voltage equipment pv magazine Deutschland, 26 September 2022 |
| Cells | Samsung lithium-ion batteries pv magazine Deutschland, 26 September 2022 |
| Power, as the owner gives it | More than 60 MW grid connection pv magazine Deutschland, 26 September 2022 |
| Energy, as the owner gives it | 67 MWh pv magazine Deutschland, 26 September 2022 |
| In operation, as the owner gives it | Completion planned for Q3 2022 pv magazine Deutschland, 26 September 2022 |
| Also published | Developed by ju:niz Energy (named Smart Power as developer and operator in 2022); EQT acquired ju:niz, announced 2024-12-05. Current owner of the SMAREG 4 company not stated ESS News, 6 December 2024 |
| Also published | Inferred: the Dealroom profile for ju:niz Energy carries the legal name Smart Power GmbH & Co. KG and lists an EQT buyout in December 2024, which supports the lead that ju:niz was formerly Smart Power our inference Dealroom company profile |
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 | TEN Thüringer Energienetze GmbH ＆ Co. KG |
| Connected at | high voltage (110 kV) |
| Municipality | Eisenach, district of Wartburgkreis |
| State | Thüringen |
| Land parcel | Stockhausen, Flur 4: 251/4 |
| Permit | Stadtverwaltung Eisenach, 00663-20-66 |
| Registered position | 51.0002, 10.2311 |
| Register location | SEL981509102511 |
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 19 December 2022; last changed in the register on 25 April 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.