Battery Storage Financing: Capcora, Suena Energy Publish Whitepaper on Bankability
Frankfurt am Main — Battery storage systems are emerging as a cornerstone of Europe's energy transition. As the market matures and project pipelines grow, the financing of storage projects is becoming a central concern for developers, investors and lenders. Financial advisory boutique Capcora and trading optimization specialist Suena Energy have published a joint whitepaper on the bankability of such projects.
Marketing Model Matters More to Banks Than Technology
According to the whitepaper, debt providers weight the four assessment areas differently. Technical fundamentals play a minor role in credit assessments, while the regulatory framework carries medium weight. Project economics and the chosen marketing model are weighted most heavily. The reasoning is that technical risks in battery storage are now largely standardized and well understood, while the reliability of revenues from power trading and ancillary services markets is considerably harder to forecast than for conventional assets under Germany's EEG remuneration scheme.
A case study in the whitepaper illustrates this using a constant storage project profile (2h-BESS, commissioning in 2027). Without debt financing and with fully merchant-based marketing, the required initial equity is EUR 550 per kW, at an internal rate of return (IRR) of 15 percent. If the same merchant case is financed with a 60 percent debt share, equity requirements fall to EUR 250 per kW while the IRR rises to 20 percent. With a five-year fixed remuneration structure (full tolling, EUR 120 per kW), the debt share can be increased further to 70 percent — at the cost of some market upside and with a comparatively lower IRR of 16 percent.
"The battery storage market is entering a new phase of maturity. While technology risks continue to decline, financing institutions are placing greater emphasis on commercial structures and the predictability of future revenues. Understanding these requirements is becoming increasingly important for developers seeking to unlock competitive financing solutions," said Alexander Kuhn, Managing Partner at Capcora.
Capcora and Suena Energy Combine Financing and Marketing Expertise
Capcora, founded in 2015, is an independent financial advisory boutique based in Frankfurt am Main specializing in M&A transactions and the structuring of mezzanine, unitranche and senior debt financing for participants in Europe's energy transition. Hamburg-based partner Suena Energy markets battery storage systems and renewable energy assets and describes itself as the first fully algorithm-driven and AI-powered provider of trading optimization in this field. "Battery storage projects have significant potential to support power system flexibility and renewable integration. The way these assets are marketed and optimised will play a decisive role in shaping both their economic performance and their attractiveness to financing partners," said Lennard Wilkening, CEO and Co-Founder of Suena Energy.
Grid Connection, Not Capital, the Bottleneck
In an annex, the authors offer an outlook on current market conditions. In early May 2026, power prices on the exchange briefly fell to around minus EUR 499 per megawatt-hour — close to the statutory floor of minus EUR 500. According to the authors, this alone does not constitute a business case for storage, but it underscores the growing value of temporal flexibility in the power system. Capital and investor interest in the German storage market are currently sufficient, the authors note; the limiting factor instead is the ability to implement projects on the grid, regulatory and financing side — partly due to open questions around grid charges after 2029.
Source: IWR Online, 16 Jul 2026
