About Thermaxa

Thermaxa zero carbon steam

Who we are

Thermaxa was founded by experienced renewable energy operators who have built and scaled global energy platforms across PV, solar thermal and energy storage.

Our background spans project development, finance, engineering and asset management. We apply that experience to the heat sector, developing projects designed for operational reliability, commercial viability and long-term performance.

We are focused on execution — bringing projects from concept to operation with discipline and accountability.

What we’re building

Europe’s heat transition won’t be solved in a lab — it will be solved on construction sites.

Half of Europe’s energy demand is heat. If we want real emissions reductions this decade, we have to build repeatable, financeable projects — not wait for breakthrough technologies that may never scale.

Thermaxa builds infrastructure that delivers high-temperature clean heat directly into existing systems — avoiding the billions in network rebuilds and building retrofits required by lower-temperature alternatives. We also deliver grid-free solutions which avoid growing grid delays and connection queues.

We believe building standardized clean heat infrastructure is the best way to unlock institutional capital that can really “move the needle” on heat decarbonization this decade.

Leadership

Steven Geiger Thermaxa Energy clean heat


Steven Geiger

Co-founder, CEO

• Co-founder of Masdar; scaled from 5 people to $15B global renewables platform
• Built €200M German solar manufacturing company
• Former COO of $4B energy & tech development zone (MIT as partner)
• 12 years oil & gas background providing insight into industrial decarbonization
• MIT (BSc), Wharton (MBA)

Joachim Krueger


Dr. Joachim Krueger

Co-founder, CTO

• Founder & CEO of Solarlite (Germany)
• 25 years’ solar thermal project development
• Built 1st CSP plant in East Asia (2009)
• President of ESTELA (European Solar Thermal Electricity Association)
• Humboldt University Berlin (MSc), PhD in Renewable Energy

Alex OCinneade


Dr. Alex OCinneade

Advisor

• Founder & CEO of Gore Street Capital
• Launched London Stock Exchange’s 1st battery fund (2018)
• Scaled Gore Street Battery Storage Fund to 1.2 GW across 3 continents
• ex-Head of Investment at Masdar, managing two cleantech funds totaling $500M
• London Business School (MSc), Trinity College Dublin (PhD)

decarbonized clean heat district heating pipes

Committed to Delivering Clean Heat at Scale

Years of Heat Experience

30

We are leaders in clean heat, with 30 years’ experience delivering clean heat projects.

Projects Delivered

$1Bn

Our team has built and delivered over $1 billion of clean energy projects, including the largest zero-carbon industrial process heat project in EU as of 2026.

Our Climate Target

500Mn tons by 2035

We’re on track to eliminate 500 million tons total GHG emissions reductions by 2035, by replacing fossil heat with our zero emission clean heat service.

Shaping the Future of Heat.

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