Zero Carbon Capital

Founded in 2019, Zero Carbon Capital is a venture capital firm based in Hampshire, UK. It invests in pre-seed and seed-stage climate tech companies across the UK and Europe, focusing on scientific and hardware innovations that aim to reduce emissions by at least 0.5 gigatons of CO2e per year by 2050.

Alex Gawley

Director

Pippa Gawley

Partner

17 past transactions

Porpoise Power

Pre Seed Round in 2025
Porpoise Power is a company that specializes in developing tidal energy systems. Their innovative technology, inspired by the swimming mechanics of dolphins and whales, uses oscillating hydrofoils to harness the power of tidal streams. This unique approach allows the company to generate sustainable electricity at a relatively low cost and minimal environmental impact, even at medium tidal speeds.

Vema Hydrogen

Seed Round in 2025
Vema Hydrogen is a trailblazing company specializing in clean hydrogen production. It tackles the global challenge of decarbonization by generating hydrogen through geologic stimulation, offering a clean and cost-effective alternative to traditional methods. The company employs advanced numerical simulations, geochemical analysis, and multiphase flow studies to optimize hydrogen production. It also identifies and tests suitable geological locations for pilot projects, obtains necessary permits, and optimizes catalyst use to enhance efficiency.

IONATE

Series A in 2025
IONATE specializes in developing advanced hardware-software systems for smart grids, aiming to enhance power distribution efficiency and stability. The company's flagship product, the Hybrid Intelligent Transformer (HIT), is designed to replace traditional transformers with a smart alternative that integrates data and control for key electrical parameters. This innovative device manages voltage control, harmonic and transient removal, and power factor correction simultaneously. By enabling real-time monitoring and control, the HIT supports effective power distribution across various applications, including power generation, industrial facilities, and data centers, ultimately helping clients reduce energy loss and improve operational efficiency.

Spark e-Fuels

Pre Seed Round in 2025
Spark e-Fuels is a climate tech company that develops carbon-neutral aviation fuels by converting renewable energy, air, and water into sustainable aviation fuel. It uses integrated, modular production systems designed to scale and to connect with the lowest-cost renewable electricity, employing proprietary, load-flexible e-fuels processes to reduce production costs. This approach targets aviation's emissions by enabling widespread availability of scalable, environmentally friendly SAF for the industry.

Exergy3

Pre Seed Round in 2024
Exergy3, a spinout from the University of Edinburgh, specializes in energy storage solutions. It has developed a unique temperature energy storage technology that captures and stores excess green energy from the grid, converting it into ultra-high temperature heat. This heat is then used to displace fossil fuels in various industrial processes, thereby reducing carbon dioxide emissions. The company's solution is more cost-effective than alternatives like hydrogen carbon capture and storage, making it suitable for smaller or more remote processes.

twig bio

Pre Seed Round in 2023
twig bio operates as a bioengineering startup. twig bio using AI and robotics to find sustainable replacements for harmful ingredients.

Nitrofix

Seed Round in 2023
NitroFix is a company focused on producing ammonia through an innovative manufacturing technology that eliminates carbon emissions. By utilizing an electrochemical reaction enhanced by a novel catalyst, NitroFix achieves a zero-carbon footprint in its ammonia generation process. This sustainable production solution not only stabilizes pricing but also facilitates local ammonia production for various applications. NitroFix positions its green ammonia as a renewable energy source, a carrier for hydrogen fuel, and a fundamental component for nitrogen fertilizers, contributing to efforts aimed at reducing the global carbon footprint.

Actuation Lab

Seed Round in 2022
Actuation Lab specializes in manufacturing advanced machine components designed for industries operating in harsh environments such as marine, mining, and offshore sectors. Their innovative products, including the Callimorph technology, offer durability, power efficiency, and reduced maintenance costs.

RepAir

Series A in 2022
RepAir specializes in large-scale carbon removal technology. Its fully electric, zero-heat process efficiently separates CO2 from air using minimal energy, producing no hazardous waste or liquids.

ClimateCrop

Seed Round in 2022
ClimateCrop develops gene editing and related plant technologies to enable crops to store more carbon and energy, with the goal of increasing yields in biomass and fruit. The approach also enhances crop resilience to extreme weather, supporting climate adaptation and more reliable production for agricultural companies. Founded in 2021 and based in Ness Ziona, the company focuses on leveraging plant energy capture to boost productivity.

IONATE

Seed Round in 2022
IONATE specializes in developing advanced hardware-software systems for smart grids, aiming to enhance power distribution efficiency and stability. The company's flagship product, the Hybrid Intelligent Transformer (HIT), is designed to replace traditional transformers with a smart alternative that integrates data and control for key electrical parameters. This innovative device manages voltage control, harmonic and transient removal, and power factor correction simultaneously. By enabling real-time monitoring and control, the HIT supports effective power distribution across various applications, including power generation, industrial facilities, and data centers, ultimately helping clients reduce energy loss and improve operational efficiency.

Anaphite

Seed Round in 2022
Anaphite is a Bristol, United Kingdom-based company that develops graphene-based nanomaterials. Established in 2016, it focuses on graphene-enhanced cathodes for high-power, high-energy, low-cost lithium-ion batteries. Its nanomaterials are produced by incorporating graphene into composite materials through an inexpensive, scalable process, enabling a range of applications. Beyond energy storage, the technology is positioned to support air purification and thermal management, offering materials with advanced properties at low cost.

MicroByre

Venture Round in 2022
MicroByre, Inc. is a biotechnology company founded in 2017 and headquartered in Berkeley, California. It specializes in the genetic engineering of non-model micro-species, particularly bacteria that are challenging to manipulate for industrial applications. MicroByre has developed an innovative platform for bacterial domestication, employing an automated characterization pipeline that identifies underutilized bacteria capable of efficiently converting unrefined biomasses into commodity chemicals. This platform leverages a unique dataset to inform minimally precise genetic modifications, enhancing the bacteria's flexibility, yield, and contamination resistance while reducing the need for nutritional additives. By bridging the gap between promising biological research and practical industrial applications, MicroByre positions itself as a valuable partner for various companies seeking to improve their fermentation processes and compete with traditional petrochemical synthesis.

Multus

Seed Round in 2021
Multus is a London-based company established in 2019 that specializes in providing tailored growth media solutions for the cultivated meat industry. By utilizing a machine learning-based approach, Multus develops completely animal-free growth media designed specifically for the efficient growth of animal cells. This innovative technology enables cultivated meat companies to scale their production affordably and sustainably, allowing them to focus on creating delicious and environmentally friendly meat alternatives. Additionally, Multus optimizes a variety of growth factor proteins produced by genetically engineered microorganisms, thereby eliminating the reliance on traditional animal serum-based media. Through its efforts, Multus aims to address the diverse needs of various animal cell types and tissues, facilitating the growth of the cultivated meat sector while significantly reducing the environmental and economic impacts associated with conventional meat production.

Phycobloom

Pre Seed Round in 2020
Phycobloom is a London-based company developing algae-based oil for carbon-neutral biofuels. It employs synthetic biology to design novel algae strains that utilize atmospheric carbon dioxide to produce affordable, sustainable hydrocarbons, offering an energy source that can serve as an alternative to fossil fuels. Established in 2019, the company focuses on scalable biotechnology-driven production to deliver cleaner fuels for clients seeking greener energy solutions.

Anaphite

Seed Round in 2020
Anaphite is a Bristol, United Kingdom-based company that develops graphene-based nanomaterials. Established in 2016, it focuses on graphene-enhanced cathodes for high-power, high-energy, low-cost lithium-ion batteries. Its nanomaterials are produced by incorporating graphene into composite materials through an inexpensive, scalable process, enabling a range of applications. Beyond energy storage, the technology is positioned to support air purification and thermal management, offering materials with advanced properties at low cost.

MicroByre

Seed Round in 2019
MicroByre, Inc. is a biotechnology company founded in 2017 and headquartered in Berkeley, California. It specializes in the genetic engineering of non-model micro-species, particularly bacteria that are challenging to manipulate for industrial applications. MicroByre has developed an innovative platform for bacterial domestication, employing an automated characterization pipeline that identifies underutilized bacteria capable of efficiently converting unrefined biomasses into commodity chemicals. This platform leverages a unique dataset to inform minimally precise genetic modifications, enhancing the bacteria's flexibility, yield, and contamination resistance while reducing the need for nutritional additives. By bridging the gap between promising biological research and practical industrial applications, MicroByre positions itself as a valuable partner for various companies seeking to improve their fermentation processes and compete with traditional petrochemical synthesis.
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