PV Financing with KfW 270: Terms, Process, Pitfalls 2026

The KfW 270 loan (Erneuerbare Energien Standard) is the standard instrument when a company wants to buy its PV system but not pay for it entirely from its own funds. It finances up to 100% of the investment costs. What matters is less the program itself than the path to it: the application runs through the Hausbank, the house bank (the company's principal bank), and that bank wants to see a bankable project.

The terms in 2026

The interest rate follows KfW's risk-adjusted pricing system: the Hausbank assigns the company to a creditworthiness and collateral class, and the rate follows from that. KfW publishes the current terms on an ongoing basis; for your calculation, what counts is your bank's offer, not the advertised minimum rate.

The process: five steps

1. Quantify the project. System size, costs, yield forecast, self-consumption share. Without solid numbers there is no credit conversation; the fundamentals are covered in Is commercial rooftop PV worth it in 2026?
2. Approach the Hausbank before anything is ordered. The KfW application must be submitted before the project starts. A signed purchase order placed before the application costs you the eligibility.
3. Submit the documents. Alongside the annual financial statements, the bank expects the project documentation: yield assessment, profitability calculation, quote, and where applicable the grid connection commitment.
4. The bank passes the application on to KfW. The credit decision is made by the Hausbank; KfW provides the refinancing. Approval times depend on the quality of the documents.
5. Drawdown and proof of use. After approval, the loan is drawn down and the use of funds is documented.

The three pitfalls

Pitfall 1: project start. The most common formal error. Placing an order, even just for the substructure, before submitting the application makes the project ineligible. Planning and consulting before the application are permitted.

Pitfall 2: the documents do not speak the language of banks. Credit officers assess debt service capacity, not module efficiencies. A project without a DSCR analysis (cash flow versus debt service) and without a clean yield forecast moves to the back of the review queue. What banks mean by bankable is answered in our FAQ for capital partners.

Pitfall 3: confusing the rate with the advertised rate. Depending on creditworthiness and collateral, the risk-adjusted pricing system can land well above the advertised minimum rate. Anyone who calculates only with the best-case rate is flattering the project.

Combining it with the tax lever

KfW 270 and tax instruments are not mutually exclusive: the Investitionsabzugsbetrag under § 7g EStG, Germany's investment deduction allowance, deducts up to 50% of the planned investment from profit in advance, while the financing covers the liquidity side. Together, they substantially reduce the effective equity burden in the year of purchase.

What NEXA takes off your plate

NEXA prepares the project bank-ready in NEXA ONE: yield forecast from official data (LoD2, PVGIS), cash flow model, DSCR and LTV in the format credit officers expect, and brings it to KfW on-lending banks and regional institutions. The address is all it takes to start: Start analysis. If you want to buy, the model is described at NEXA Own; the alternatives without a loan are NEXA Lease and NEXA Zero.