Khosla Ventures portfolio Climate tech companies

Vinod Khosla's firm - deeptech, climate, healthcare, and contrarian software bets. Filtered to companies in Climate tech.

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Built from a search like: “Khosla Ventures-backed Climate tech companies”

Ranked by current headcount across Khosla Ventures-backed Climate tech companies. Refreshed monthly.

1
Mainspring Energy· Menlo Park, California, United States
Mainspring is a power generator manufacturer redefining how local power is delivered to capacity constrained companies and communities. No other primary power solution can match the flexibility, affordability, and low emissions of a Mainspring Linear Generator. Mainspring customers across key industries — utilities, data centers, enterprise, and industrial — are taking control of their energy futures.
- Series F
- 522 employees
- Founded 2010
2
Brenco
Brenco - Companhia Brasileira de Energia Renovável is a renewable energy company, implementing industrial plants to produce ethanol and electricity from sugar cane in Brazil.Current projects are greenfield sites in the midwest region of Brazil (states of Goiás, Mato Grosso & Mato Grosso do Sul).
- Series unknown
- 109 employees
- Founded 2007
3
Realta Fusion· Madison, Wisconsin, United States
Realta Fusion spun out of a groundbreaking physics experiment at the University of Wisconsin-Madison in 2022 and is developing the lowest capital and least complex path to commercially competitive fusion energy. We are applying advances in super-conducting materials, plasma physics, and computing power to a simple linear fusion machine. These advances allow for a much lower capex power plant, utilizing abundant fuel sources to provide a new, zero-carbon source of heat and power.
- Corporate
- 66 employees
- Founded 2022
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4
Caelux®· Baldwin Park, California, United States
Caelux®'s proprietary technologies improve the performance of any new crystalline silicon module, making solar energy more powerful and cost-effective. Headquartered in Baldwin Park, California, Caelux is at the forefront of the emerging science of perovskites, a special class of nanomaterials. Its flagship product, Caelux® One, is an innovative product that integrates seamlessly into existing PV module manufacturing processes, boosting performance, reducing installed costs, and accelerating the proliferation of solar. For more information, visit www.caelux.com.
- Series A
- 56 employees
- Founded 2014
5
Spiritus
Spiritus is a climate tech company at the forefront of Direct-Air-Capture (DAC) technology. The company's approach combines the Spiritus Sorbent and the Spiritus Carbon Orchard, offering a scalable and modular system for low-cost DAC and sequestration (DAC+S). Spiritus is committed to making carbon removal an accessible and practical tool in the global fight against climate change. For more information, visit Spiritus.com
- Series A
- 56 employees
- Founded 2021

6
Ambri· Marlborough, Massachusetts, United States
Ambri’s Liquid Metal BatteryTM technology solves the world’s biggest energy problems – fundamentally changing the way power grids operate by increasing the contribution from renewable resources and reducing the need to build traditional power plants. Ambri’s long duration energy storage solution is built for daily cycling – even in extreme, harsh environments. With a lifespan of 20+ years with minimal fade, Ambri systems are not only extremely reliable but also safe as Ambri systems do not produce or emit any gases and no possibility for thermal runaway.
- Series unknown
- 55 employees
- Founded 2010
7
Planted· Oakland, California, United States
Planted is the autonomous power deployment company, combining planning software, high-density terrain-following solar arrays, storage, and field robotics into one system that transforms power plants from bespoke construction projects into manufactured products. The system delivers more power on less land in a fraction of the time. Planted provides low-cost generation and firmed power today, and is extending to powered land for customers that cannot wait for the grid.Backed by Khosla Ventures, Breakthrough Energy Ventures, and Piva Capital.
- Series A
- 49 employees
- Founded 2020
8
Infinia Corporation
Stirling-engine Developer Qnergy Acquires US-based InfiniaTEL AVIV, Israel, November 21, 2013 /PRNewswire/"Qnergy, an Israeli-based Stirling engine manufacturer and its U.S affiliate, has acquired the assets of US-based Infinia Corporation Inc. located in Ogden, Utah. Qnergy plans to integrate the core technologies and know-how of both companies in order to commence mass production of Stirling engines for various applications within the coming twelve months.Qnergy (http://www.qnergy.com) was established in 2009 by Ricor Cryogenic and Vacuum Systems, a world leader in the field of miniature Stirling cryogenic coolers. Qnergy's technology enables residential and business customers to generate power and hot water on-site (Distributed Power Generation) with total efficiency of more than 90%.The company develops and manufactures highly efficient, reliable and cost-effective Stirling engines for various applications such as: micro-combined heat and power (mCHP), solar power generation and solar CHP, remote power generation and more.Infinia Corporation is an energy technology company, developing and manufacturing high-efficiency, free piston Stirling generators that convert readily available and low cost heat sources such as solar, biogas and natural gas into reliable on and off grid electricity. Following 40 years of its ultra-high reliability technology for the DOD, NASA and DOE, Infinia has recently launched its solar product - the PowerDishTM. The PowerDish is the world's first Stirling-based solar power generation system suitable for automotive scale manufacturing and deployment, from small distribution scale arrays to multi megawatt utility scale solar plants. Infinia filed for chapter 11 and pursued a going concern sale of its assets this past September."
- Debt
- 40 employees
- Founded 1985
9
TeraWatt Technology Inc.· Santa Clara, California, United States
We provide lithium-ion rechargeable cells with ultra-high energy density
- Series C
- 38 employees
- Founded 2020
10
Mazama Energy· Frisco, Texas, United States
Mazama Energy’s mission is to drive human progress by delivering large-scale, clean geothermal power from Superhot Rocks (SHR). Mazama Energy brings together geothermal expertise and oil and gas engineering knowhow to design robust Engineered Geothermal Systems (EGS) to harness the immense potential of SHR. Mazama Energy’s strong team, deep knowledge base, extensive IP, and robust technology portfolio can redefine geothermal energy to be global and cost competitive with fossil fuels.
- Series A
- 33 employees
- Founded 2023

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Khosla Ventures’s Climate tech portfolio

The list above ranks Khosla Ventures-backed Climate tech companies by current headcount, drawn from public LinkedIn and Crunchbase records. 13 matching companies in Refolk’s index give you a quick read on where Khosla Ventures has gone deepest in the Climate tech space.

Khosla Ventures’s Climate tech bets tend to share a thesis. The engineers, ML researchers, and founders inside these companies are often building the same primitives - and they show up in Climate tech talent pools across the next decade.

Refolk converts this list into a live search. Ask for “Khosla Ventures Climate tech companies hiring senior engineers” or “founders of Khosla Ventures-backed Climate tech companies” and Refolk returns a fresh ranked shortlist.

How this list is built

Refolk pulled Climate tech companies whose disclosed Crunchbase investor list includes Khosla Ventures, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes monthly.

Last refreshed: Fri, 18 Sep 2026 08:00:15 GMT

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