Climate Tech Partners (CTP), a venture capital firm focused on early-stage climate technologies, has secured $50 million in commitments for its first fund close, drawing backing from major institutional and corporate investors.
Established in 2023 by Patrick Sieb and Tom Kline—previously behind Investible’s climate fund—CTP received $15 million each from Australian Ethical Investments (AEI) and the federal government’s Clean Energy Finance Corporation (CEFC). This follows a joint $15 million commitment from Qantas and Airbus earlier this year, earmarked for decarbonisation solutions in aviation, such as sustainable aviation fuel.
CTP aims to invest in sectors central to the energy transition, including energy and power, transport and logistics, and heavy industries. Its strategy is designed to align investments with the needs of corporate partners, who are expected to be key users of the technologies it supports. The fund has attracted 11 corporate partners across energy, transport, industrials, and mining. Among the early backers is billionaire Daniel Besen’s family office, acting as an anchor investor.
Tom Kline noted that policy stability under the Albanese government has strengthened confidence in the cleantech sector, signalling longer-term climate ambition and creating a more favourable environment for innovation and investment.
Malcolm Thornton, head of growth capital at the CEFC, said their involvement aims to support the rapid development and commercialisation of technologies essential to Australia’s net-zero transition. He highlighted the role of venture capital in advancing innovations in prototyping, manufacturing, and market readiness.
The CEFC’s support for CTP follows an expansion of its mandate in January 2025, when the federal government allocated an additional $2 billion to the green bank. The CEFC has also invested in other climate-focused initiatives, including $200 million in a fund managed by Virescent Ventures and direct investments in startups such as rideshare fleet operator Splend and renewables lender Infradebt.
Co-founder Patrick Sieb pointed to growing momentum in areas such as electrification, sustainable fuels, and next-generation grid technologies. “With technology maturity, market demand, and policy support converging, this is a defining moment for climate investment,” he said.
