Deutsche Bank and Rabobank have underwritten $934.28 million for Return Storage to build batteries in Germany. The facility currently funds three assets, and those three come to 117 MW between them. Divide one figure by the other and the result is nearly ten times what German batteries have been borrowing per megawatt. The arithmetic is not wrong. The facility is simply not sized to the assets drawing on it.
Key takeaways
- Return Storage secured $934.28 million from Deutsche Bank and Rabobank, announced on 4 November 2026, structured as a portfolio debt facility underwritten jointly by both banks for the construction of large-scale battery energy storage in Germany.
- The facility currently encompasses three battery energy storage assets with a combined capacity of 117 MW, all three under construction, with further projects to be added to the facility during 2027.
- The three assets operate at a four-hour duration with two full cycles per day and are expected to generate about 341.64 GWh a year between them.
- From 2027 Return Storage plans to install at least 1 GW of battery storage a year in Germany, investing between $839.17 million and $1.3 billion annually.
- Enerdatics records the facility as the largest disclosed debt package raised for German battery storage since the start of 2024, ahead of the $502.13 million TotalEnergies and Allianz Global Investors raised in July 2026 against an 11-project, 789 MW portfolio.
Why is the facility so much larger than the capacity it funds?
Because it is a framework rather than a project loan. A project loan is sized to one asset's construction cost and drawn down against milestones on that asset. A portfolio facility is sized to a build programme, sets the terms once, and admits new projects as they reach the agreed conditions. Return Storage has said further projects will join during 2027, and the company intends to install at least 1 GW a year from that point at an annual spend of $839.17 million to $1.3 billion.
Read against that programme rather than against the 117 MW, the facility is roughly one year of planned capital expenditure. Read against the three assets, it prices at $7.99 million per MW, a figure that describes nothing about the cost of a German battery. The facility also integrates funding for physical infrastructure with what Return Storage calls a virtual flexibility portfolio, meaning the lenders are underwriting trading and aggregation capability alongside the hardware.
What do German batteries normally borrow per megawatt?
Under a million dollars. GIGA Storage raised $291.29 million from seven banks in October 2026 for the 350 MW and 1,400 MWh Albatross project, which is $0.83 million per MW. TotalEnergies and Allianz Global Investors raised $502.13 million against 789 MW and 1,628 MWh in July 2026, or $0.64 million per MW, with debt covering 70 percent of the project cost. Those are the two largest German battery debt facilities on record before this one, and both land in the same range.
Return Storage's 117 MW at four hours is 468 MWh, which puts the facility at about $2.00 million per MWh of energy capacity. Against the Albatross print of $0.21 million per MWh the gap is the same order of magnitude whichever denominator is used, which confirms that the difference is structural rather than a duration effect. The Albatross financing needed seven lenders to reach that figure. Return Storage needed two to reach three times it.
What does the output figure reveal about the business model?
That these assets are built to arbitrage, not to stand idle. Four-hour duration means a battery can discharge at full power for four hours before it is empty, and two full cycles a day means it charges and discharges twice in every 24 hours. Put 117 MW on that schedule and the annual throughput works out at 341.64 GWh, which is exactly the figure on record. The number is not a forecast of market conditions. It is the physical ceiling of the configuration, assumed to be reached every day of the year.
An asset dispatched that hard earns from the spread between cheap and expensive hours, and it degrades on a schedule set by cycling rather than by age. That is what the virtual flexibility portfolio is for, and it is why the advisory list runs to eight firms including Baringa on commercial matters and DNV on technical. Lenders underwriting twice-daily cycling want an independent view of both the price spread and the cell chemistry.
Enerdatics records 21 battery storage financings in Germany since the start of 2024. Eight of them disclose an amount against a debt facility, and Return Storage's $934.28 million is the largest of the eight by a factor of more than three. Only one German battery financing of any type on record is larger: the $1.03 billion hybrid package green flexibility raised in January 2025, which included equity from Partners Group rather than being debt alone.
What does the deal signal for German battery storage?
That the German battery market has reached the stage where lenders will underwrite a pipeline rather than a project. Two banks taking $934.28 million jointly, with no syndicate, is a different proposition from seven banks sharing $291.29 million against one asset. It implies a credit view formed on the sponsor and its build programme, which is the structure solar and onshore wind reached years ago and batteries have not.
The second signal is the gearing question nobody has answered yet. Debt packages have been running ahead of disclosed build costs elsewhere this year, and in Germany the capital stacks behind batteries remain largely private. Greenvolt financed 400 MW of Polish batteries and sold them two months later, a sequence that only works if the debt is portable. If facilities of this shape become the norm, the interesting disclosure will stop being the headline amount and start being how much of the programme it is actually expected to cover.
Frequently asked questions
How much has Return Storage raised and from whom?$934.28 million, announced on 4 November 2026, from Deutsche Bank and Rabobank as a jointly underwritten portfolio debt facility. Rabobank also acted as financial adviser, with Hogan Lovells and Cadwalader advising Return Storage.
How much battery capacity does the facility fund?Three assets totalling 117 MW at present, all under construction, with additional projects to be added during 2027. At four-hour duration and two cycles a day the three are expected to produce about 341.64 GWh a year.
Is this the largest German battery financing on record?It is the largest disclosed debt facility Enerdatics records for German battery storage since the start of 2024. One larger financing exists in the market: green flexibility's $1.03 billion package from January 2025, which was a hybrid of debt and equity rather than a debt facility.
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