Financing a direct investment: bank loan, KfW 270 and the pitfalls

Anyone looking at a direct investment in a solar park or battery storage system for the first time quickly notices: the financing is not an afterthought but a load-bearing part of the structure. A substantial share of the investment project-typically comes from a bank, secured against the asset itself; the equity is the smaller remainder. That puts questions centre stage which never arise in a pure equity investment: Which bank finances something like this? Are there promotional loans? And what must never happen in the wrong order?

How much equity does an energy direct investment need?

Project-typically, energy direct investments are financed with 60 to 75% debt, secured against the asset itself. Together with the tax refund from the investment deduction (IAB), which arrives before or alongside closing, this pushes the effective equity outlay into the single-digit percentage range of the investment volume for investors in the right tax situation; the full calculation is set out in How much equity is actually required?, and the calculator on the homepage gives a first impression. On paper, even more would be possible: the KfW 270 promotional loan finances up to 100% of the investment costs. In practice, however, it is not the programme that decides the ratio but the bank: it examines creditworthiness, collateral and whether the debt service can be carried even in weak revenue years. A high debt ratio is therefore not an entitlement but the result of a robust project and robust creditworthiness.

What is the KfW 270 loan, and who qualifies?

The KfW loan 270 ("Renewable Energies Standard") is the standard promotional programme of Germany's state-owned KfW bank for investments in renewable energy. It finances, among other things, photovoltaics on open land and rooftops, agri-PV, wind power and battery storage; storage systems are explicitly eligible as a standalone measure, not only in combination with a solar installation. Alongside companies, natural persons are eligible if they act commercially or are taking up a commercial activity. That is precisely the structure of the direct investment: the investor operates their unit as their own sole proprietorship, earns commercial income from selling electricity and is themselves the borrower. For a pure battery storage system without its own power generation, the bank confirms the specific classification with the application; that belongs on the list of questions to settle before reserving a unit.

Important for understanding the process: KfW does not lend directly. The application runs through a bank of your choice, which passes the KfW loan through and assesses the credit risk itself. You therefore do not need a new banking relationship with KfW, but you do need a bank that handles such projects; traditional branch banks, cooperative banks and environmental banks do, while smartphone-only banks generally do not pass through KfW loans.

Which terms and maturities does KfW 270 offer?

There is no such thing as a flat "KfW interest rate": the bank assigns the borrower to a price class based on creditworthiness and collateral; each class has a fixed interest cap, and the individual rate can sit below it. KfW publishes the current caps in its terms overview. For direct investments, 10 or 15 years is usually the sensible maturity in practice, with the rate fixed over the full term: the site or land-use contract of the installation has to cover the loan term, and the useful life of the asset sets the frame. Two details that are often misunderstood: repayment-free start-up years sit compulsorily at the beginning of the term and are fixed when the application is filed; they cannot be saved up for a later weak year. Anyone wanting a buffer for poor revenue years plans it as a liquidity reserve, not via the start-up period.

When must the KfW application be filed?

The application must be filed before you conclude a legally binding contract for the project; in a direct investment, that means before signing the purchase contract. Whoever buys first and finances afterwards has triggered the "start of the project" with the purchase contract, and retroactive funding is excluded. The correct sequence therefore looks like this:

1. Non-binding reservation of the unit: it secures the project without triggering a legally binding contract.
2. Meeting with the bank: submit the project documentation package, clarify eligibility and terms.
3. Loan application: the bank files the KfW application before anything is signed.
4. Wait for the commitment from the bank and KfW.
5. Only now: sign the purchase contract.
6. Drawdown of the loan, payment of the purchase price, closing.

Two further timing points: the commitment should not be obtained arbitrarily early, because from a certain point after the commitment a commitment fee accrues on the amount not yet drawn (in programme 270 currently 0.15% per month from the seventh month). And whoever lets a granted commitment lapse only receives a new one for the same project after a six-month blocking period. With an existing banking relationship and complete documents, three to five weeks from the bank enquiry to the commitment is a realistic estimate; how this fits into the overall process from the first conversation to closing is shown in From first enquiry to closing: how a direct investment works step by step.

Does the investment deduction (IAB) work with debt?

Yes. The investment deduction under §7g of the German Income Tax Act is measured against the acquisition costs of the asset, not against where the money comes from: whether you pay for the installation out of equity, with a bank loan or a mix changes nothing about the IAB or the special depreciation. Debt financing and the tax lever are not mutually exclusive; in the typical structure they are in fact combined. The detailed requirements of §7g are set out in Investitionsabzugsbetrag: all §7g EStG requirements, and who can use it.

Two arrangements, however, can destroy the tax lever, and both appear in the market. First, classic leasing: it makes the lessor the beneficial owner of the installation, which eliminates the IAB and depreciation for the investor; the entire tax concept falls away. A hire-purchase arrangement, by contrast, can work, because beneficial ownership sits with the investor from the outset. Anyone offered a "leasing solution" should ask exactly this question: who is the beneficial owner? Second, bundling several investors into a GbR partnership, for instance to save on loan applications: the IAB ceiling of €200,000 and the profit threshold apply per business, and a GbR is one business. Three investors in one GbR share one ceiling, while three separate sole proprietorships have three; on top of that, every partner in a GbR is liable for the entire loan. The clean standard case remains: one investor, one sole proprietorship, one unit, one loan. And one piece of relief for the timeline: if the financing slips, the IAB is not lost, because a three-year window remains for the acquisition; the deadlines in detail are covered in Forming the IAB now: which tax deadlines and time windows count in 2026/2027.

What does the bank require for the financing?

A bank does not finance a promise; it finances a package of robust contracts and evidence. In an energy direct investment, that typically includes:

• Own metering and market location per unit: they prove that the investor operates their own installation rather than holding an economic interest in someone else's. That carries the tax concept as well as the financing.
• A site or land-use contract that covers the full loan term and is secured in rem: no bank finances a 15-year loan against a 10-year right of use.
• An independent revenue appraisal by a third party, not just the provider's own calculation.
• The marketing contract for the electricity sales, with its term and termination rights.
• An insurance concept, usually with the bank as beneficiary; how the assignment of the insurance claims is structured is explained in Insuring a solar park or battery storage asset: which policies belong to a direct investment, and who holds them.
• A collateral concept, typically transfer of the installation by way of security and assignment of the marketing revenues.

From the investor's perspective, this list doubles as a checklist for the provider. Four questions to ask before any reservation: Does the site contract cover the full loan term? Is there an independent revenue appraisal? Who exactly is the purchaser and the borrower? Purchaser and borrower have to match, otherwise tax distortions loom; the details are in Invest through your GmbH or privately? The honest tax comparison. And finally: does the provider earn from the financing, for instance through ongoing commissions from the lending bank? Such trail commissions create conflicts of interest and belong disclosed; what a transparent cost breakdown has to contain is shown in Transparent costs: which fees a direct investment involves, and which ones are hidden.

Which costs get forgotten in the financing?

• VAT on the purchase price: the promotional loan finances the net investment; as a VAT-registered business owner you reclaim the 19% VAT from the tax office, but you have to advance it until the refund arrives. On €300,000 net that is €57,000, which needs to be planned as a separate short-term credit line or liquidity. The mechanics of the refund and the required waiver of the small-business scheme are covered in VAT on PV and storage direct investments: why 19% is charged here, and how it flows back.
• The commitment fee: it accrues after the commitment on the loan amount not yet drawn. Hence: only obtain the commitment once closing is in sight.
• The prepayment penalty: whoever repays the loan before the end of the term, for instance when selling the installation, compensates the bank for the lost interest. The amount depends on the remaining term and the interest rate environment; before any special repayment or an exit, have the bank quantify it.

What are the risks of debt financing?

Debt is a lever, and a lever works in both directions. The debt service of interest and principal is contractually fixed, while the installation's revenues are not: if they come in weaker in a given year, the instalment still has to be paid. That is why banks calculate with a buffer between revenues and debt service (the debt service coverage ratio), and why the maximum debt ratio is rarely the wisest one: whoever maxes out the lever has no room in weak years. A long fixed-rate period takes the interest rate risk out of the equation but does not replace a liquidity reserve. How the financing risk fits in with the other project risks, from power prices to technology, is set out in Risks in BESS direct investments, and how they are structurally addressed. And regardless of any financing: a direct investment remains an entrepreneurial investment with a corresponding risk of loss; the loan has to be serviced even if the installation falls short of expectations.

In practice, we accompany investors through exactly this process: with a bank-ready documentation package for the project, at whose core is the independent yield assessment with its P90 value (see Reading a yield assessment: what P50 and P90 mean for a solar park direct investment), and the right sequence from reservation to commitment. You file the loan application yourself through your bank, and the loan agreement comes about exclusively between you and your bank; we do not broker loans and do not advise on financing. In a no-obligation initial consultation we walk through what a financing could look like for your situation, with disclosed assumptions instead of a marketing figure.