Climate VC, San Francisco

Lowercarbon Capital

Venture capital firm · San Francisco · Founded 2018

Quick read

Lowercarbon Capital is a climate-focused VC firm founded by Chris and Crystal Sacca, headquartered in San Francisco (registered in Jackson, WY). It backs companies slashing CO₂ emissions, removing carbon from the atmosphere, and buying time against climate change — with ~$1.2B AUM and a portfolio spanning fusion energy, carbon removal, industrial decarbonization, and beyond. The firm takes a deliberately broad view: if markets can fix the planet faster than activism, Lowercarbon is writing the check.

Key facts

Founded
2018
Founders
Chris Sacca, Crystal Sacca, Clay Dumas
Employees
28
Sectors
climate
Website
lowercarbon.com

Investment thesis

Lowercarbon backs companies across three buckets — slashing new CO₂ emissions, sucking carbon out of the atmosphere, and buying more time against climate change — betting that profitable markets, not shame, will decarbonize the planet. The firm also funds nonprofit research when the science is critical but no business model yet exists.

Recent activity

  • Oct 2025investment
    Lowercarbon co-led a £50m funding round in Fuse Energy alongside Balderton Capital. Fuse operates a vertically integrated renewable energy company targeting lower household energy costs. soapbox.vc
  • 2025investment
    Tracxn recorded one new Lowercarbon investment in the past 12 months as of Feb 2026, with the most recent being a Seed round participation in Emerald Overall. tracxn.com
  • 2024press
    Lowercarbon-backed fusion startups collectively won 70% of a $46m DOE award program supporting eight fusion companies building their first power plants. muskviewer.com
  • 2024leadership
    Lyna Kim joined Lowercarbon as an Associate. She previously co-founded LightbulbML, an AI patent software service acquired in 2024, and built AI weather forecasting systems at WindBorne Systems. lowercarbon.com
  • Nov 2025fundraise
    Lowercarbon Capital announced it's raising a second nuclear fusion fund, disclosed at the SOSV Climate Tech Summit. The new fund is expected to exceed the $250M fusion-focused fund raised in 2022. Fund size was not publicly confirmed. mezha.net
  • Apr 2025investment
    Lowercarbon led the Series B round for Crux, a transferable tax credit marketplace co-founded by Alfred Johnson and Allen Kramer. Lowercarbon had put in the first dollars at seed stage two years prior. lowercarbon.com
  • 2025leadership
    Alexandra Frumar joined Lowercarbon Capital as General Counsel. She previously served as Chief Legal Officer at Lowercarbon portfolio company Remora, and before that co-founded FD Law, a boutique firm serving the Y Combinator community. lowercarbon.com
  • Mar 2025investment
    Lowercarbon participated in Epoch Biodesign's €17M round, backing the biotech startup working to turn plastic waste into a circular resource. tracxn.com
  • Feb 2025investment
    Lowercarbon co-invested in Pendulum's $22M total funding round alongside Cross Border Impact Ventures and Decisive Point. tracxn.com
  • Dec 2024investment
    Lowercarbon participated in a funding round for Flair Systems alongside RectorSeal and SOSV, backing smart HVAC control solutions. tracxn.com
  • Dec 2024investment
    Lowercarbon co-invested in SolarSquare's $40M Series B, India's largest solar startup funding round, alongside Lightspeed and Lightrock. tracxn.com
  • 2024leadership
    Duncan Carlson posted a rare hiring alert for a Technical Lead on Lowercarbon's growth investing team, one of the firm's few public job openings. linkedin.com

Notable investments

Key people

Named individuals at the firm. We don't expose direct email or phone — use their LinkedIn for outreach.

Sources

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Frequently asked

What is Lowercarbon Capital?+

Lowercarbon Capital is a climate-focused VC firm founded by Chris and Crystal Sacca, headquartered in San Francisco (registered in Jackson, WY). It backs companies slashing CO₂ emissions, removing carbon from the atmosphere, and buying time against climate change — with ~$1.

Where is Lowercarbon Capital headquartered?+

Lowercarbon Capital is headquartered in San Francisco, United States.

When was Lowercarbon Capital founded?+

Lowercarbon Capital was founded in 2018 by Chris Sacca, Crystal Sacca, Clay Dumas.

What sectors does Lowercarbon Capital invest in?+

Lowercarbon Capital focuses on climate. They primarily invest in these sectors.

How do I prepare for a meeting with Lowercarbon Capital?+

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Generated by briefthecall.com from public web sources. Last updated July 8, 2026. Each claim is linked to its source above.

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