KfW study: €290 billion a year for climate neutrality, more than a fifth of it for buildings

What KfW calculated on 12 October

On 12 October 2026, KfW published a study according to which Germany must invest around six trillion euros by 2045 to become climate-neutral. That is €290 billion a year. Compared with fossil reference technologies, the additional requirement is €65 billion annually. Between 2018 and 2023, an average of only €110 billion a year flowed into these areas, leaving a gap of around €180 billion. A large share of the energy investment goes into heat networks, and what new networks cost ends up in the heat price later, as the guide to district heating price increases shows.

Which owners and businesses have to shoulder the investment

Transport accounts for 45 per cent, energy supply for 25 per cent, buildings for 22 per cent and industry for 8 per cent. For buildings, that works out at roughly €64 billion a year. The package is carried overwhelmingly by the private sector: €257 billion a year falls to private players, €33 billion to the public sector. Those affected include landlords and housing companies modernising their stock, businesses with their own halls and offices, and everyone connected to a district heating network. According to KfW, energy suppliers need around €1.3 trillion for power grids, district heating and renewables.

Why the figure matters for every heating decision

Six trillion euros sounds like a budget debate in Berlin, but it is above all a bill for private owners. If almost nine out of ten euros have to be raised privately, progress in the building stock depends on whether a new heating system pays off for the owner and whether they can finance it.

Since 2021 I have seen in heating projects that what is rarely missing is the will; it is the capital at the right moment. On top of that, suppliers' network investments do not arrive as a separate bill; they are refinanced over years through heat and electricity prices. Anyone making a heating decision today is buying into that cost trend.

What to do now

1. For each property, note when the heating system or the heat supply contract expires, and derive an investment plan from that.
2. Compare financing routes: equity, subsidised loan, grant or external heat supply, each calculated over 15 to 20 years.
3. For district heating, compare the price adjustment clause and the price sheets of recent years to see how fast the standing charge and unit price are rising.