Global climate technology investment rose sharply during the first half of 2026 as demand for lower carbon power from data centres redirected capital towards energy generation, storage, grids, and related infrastructure.
Figures from Currence show that climate technology companies raised $26.1bn in venture funding during the six month period, an increase of 55% compared with a year earlier and the strongest first half performance since 2022.
The recovery was highly concentrated. Technologies linked to rising data centre electricity demand captured 34% of investment, compared with 3% a year earlier, while the ten largest transactions accounted for more than 40% of all capital raised.
Deal numbers fell by 25%, indicating that investors committed larger sums to a smaller group of companies rather than supporting a broad recovery across the market.
Construction of data centres has accelerated as technology companies expand computing capacity for artificial intelligence, cloud services, and digital infrastructure. These facilities require large and dependable electricity supplies, creating demand for renewable generation, geothermal power, nuclear technology, long duration storage, grid equipment, and energy management systems.
Capital has followed technologies capable of addressing an immediate commercial constraint. Data centre operators need power quickly, yet new generation and grid connections can take years to develop. Companies able to reduce those delays or provide reliable on-site capacity have consequently attracted substantial interest.
Public market activity also increased during the period. Several major listings and acquisitions provided investors with routes to realise returns, including activity involving geothermal developer Fervo Energy and advanced reactor business X-energy.
Exit opportunities are particularly important in climate technology because many companies require large amounts of capital over long development periods. Weak public markets and limited acquisition activity have previously made it difficult for venture funds to return money to their investors.
The headline recovery does not indicate an improvement across every part of the sector. Early stage companies, hardware developers without major customers, and technologies dependent on uncertain policy support may still struggle to raise finance.
Falling deal numbers suggest that investment committees are prioritising scale, proven demand, and credible routes to deployment. Businesses with strategic customers or infrastructure contracts are better placed than those relying principally on future regulation or anticipated consumer behaviour.
AI infrastructure is already increasing the environmental footprint of major technology companies. An examination of Microsoft’s rising emissions during its data centre expansion illustrated the tension between rapid computing growth and corporate climate targets.
That tension now influences investment markets. Technology companies have signed long term power purchase agreements, supported nuclear restarts, invested in grid capacity, and established direct relationships with energy developers. These contracts can give climate technology companies the revenue certainty needed to finance projects.
Dependence on a small group of large technology buyers also creates concentration risk. Funding could slow if data centre construction is delayed, electricity forecasts are revised, or expected returns from AI investment weaken.
Energy projects remain exposed to planning, permitting, supply chain, and connection constraints. Raising venture capital does not ensure that generation assets can be constructed on schedule, particularly where projects depend on transmission upgrades or specialist equipment.
The concentration of capital in large transactions may also leave other areas of climate innovation underfunded. Industrial decarbonisation, sustainable materials, agricultural systems, adaptation, and nature restoration do not always have the same immediate purchasing power behind them as data centre energy.
The first half figures should therefore be read as a selective recovery rather than a universal return of confidence. Capital has increased substantially, but it is clustering around technologies with large customers, visible demand, and a clearer path to commercial deployment.
Established energy and engineering companies may find partnership and acquisition opportunities within that environment. Larger organisations can provide manufacturing capacity, project delivery expertise, regulatory knowledge, and access to customers that venture backed developers often lack.
Government policy will still influence whether investment produces operating infrastructure. Planning reform, grid queues, market design, and long term regulatory stability determine how quickly a technology can progress from demonstration to commercial deployment.
Supply chains will face pressure if several large projects proceed simultaneously. Transformers, turbines, specialist cables, cooling systems, and electrical equipment already have long lead times in some markets, creating another possible constraint on growth.
The recovery demonstrates that climate technology can attract significant private capital when it addresses a clearly priced and urgent commercial need. Data centre power demand currently provides that signal more strongly than many other decarbonisation markets.
Its durability will depend on whether investment broadens beyond a small number of transactions and whether funded companies convert capital into operational assets. Until that occurs, the sector’s stronger funding total will coexist with a more selective and concentrated investment environment.
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