KfW study: Germany needs €6 trillion to reach climate neutrality by 2045
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Image credit: KfW Bankengruppe · Public domain · Wikimedia Commons
In brief
A new study by Germany's state development bank KfW, conducted by the consultancy Prognos, puts the total investment needed for Germany to become climate-neutral by 2045 at roughly €6 trillion, or about €290 billion a year. KfW frames the goal as "ambitious but manageable," noting the additional cost compared with continuing fossil-fuel technologies is €65 billion a year — under 2% of GDP.
Germany's state-owned development bank KfW published a new study on 12 October 2026 estimating that the country needs to invest about €6 trillion between now and 2045 to reach its legally binding goal of climate neutrality. The analysis, carried out by the consultancy Prognos on behalf of KfW, was presented four weeks ahead of the COP31 UN Climate Change Conference, due to be held in Antalya, Turkey, in November 2026.
Spread over the period to 2045, the €6 trillion figure translates into roughly €290 billion of investment per year, according to KfW and the climate-policy news outlet Clean Energy Wire, which also reviewed the study.
Where the money would go
According to the breakdown reported by KfW and Clean Energy Wire, transport accounts for the largest share of the needed investment at 45 percent, followed by energy at 25 percent, buildings at 22 percent and industry at 8 percent.
Sector share of Germany's estimated €6 trillion climate-neutrality investment to 2045
Sector
Share of total investment
Transport
45%
Energy
25%
Buildings
22%
Industry
8%
Who pays: public versus private capital
KfW's figures indicate that the public sector would cover only a minority of the costs. Of the roughly €290 billion needed annually, about €33 billion would come from public budgets, while the remaining approximately €257 billion would have to come from private capital, according to KfW's own press release.
KfW notes that current climate-related investment is running well below what is required. Between 2018 and 2023, Germany invested an average of about €110 billion a year in climate-friendly projects — meaning the annual gap to the €290 billion target is roughly €180 billion, based on the KfW and Clean Energy Wire figures.
The cost of inaction, according to KfW
KfW frames part of the €6 trillion as spending that would happen in any case, since replacing ageing infrastructure, vehicles and heating systems involves cost regardless of climate policy. When only the additional cost of choosing low-carbon technology over continued fossil-fuel technology is counted, the extra annual investment need falls to about €65 billion — a figure KfW and Clean Energy Wire both describe as under 2 percent of Germany's gross domestic product.
Germany is facing an ambitious but manageable challenge in the transition to climate neutrality.
— Stefan Wintels, CEO of KfW, cited in the bank's press release on the study
The new estimate updates KfW's previous study from 2021, which had put the total investment requirement at €5 trillion. KfW attributes part of the one-trillion-euro increase to higher prices and investment bottlenecks recorded since that earlier calculation.
Why the timing matters
KfW released the figures shortly before COP31, which is due to be held in Antalya, Turkey, in November 2026, giving the German bank's cost estimate added relevance as governments prepare to discuss how to fund the global energy transition.
Questions
How much will Germany's climate neutrality cost in total, according to KfW?
KfW's study, carried out by Prognos, puts the total investment need at about €6 trillion between now and 2045, equivalent to roughly €290 billion per year.
Which sector needs the most investment?
Transport needs the largest share at 45 percent of the total, followed by energy (25 percent), buildings (22 percent) and industry (8 percent), according to KfW's breakdown.
Who is expected to pay — the government or private companies?
Most of the money has to come from private capital: KfW estimates public budgets would cover about €33 billion of the roughly €290 billion needed each year, with the rest coming from businesses and private investors.
Is €6 trillion more than Germany currently spends on climate action?
Yes. KfW says average annual climate-related investment between 2018 and 2023 was about €110 billion, leaving an annual shortfall of roughly €180 billion compared with the €290 billion the study says is needed.
Why did KfW publish this study now?
KfW presented the figures on 12 October 2026, about four weeks before the COP31 UN Climate Change Conference opens in Antalya, Turkey, where climate finance is expected to be discussed.
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