Participated · Series B · Jun 2026

Captura designs and manufactures a PFAS-free bipolar membrane electrodialysis platform that generates acid and base streams for applications including direct lithium extraction, industrial water treatment, long-duration energy storage, and CO2 management. The platform was originally developed to power Captura’s Direct Ocean Capture (DOC) system, which removes CO2 from seawater for permanent storage or utilization. Captura operates the only U.S.-based production plant that produces complete electrodialysis systems and plans to scale domestic manufacturing capacity following its Series B raise. The company reports that its technology offers greater performance with significantly lower energy consumption and capital costs compared with leading market alternatives. Captura recently secured multiple purchase orders for its first electrodialysis stacks addressing the lithium extraction market, with initial deliveries expected this summer. CEO Steve Oldham says the company is now manufacturing systems for customers while continuing to advance commercial deployment of DOC globally.

Participated · Seed · Mar 2026

Delfos Energy develops applied AI software that ingests live operational data from renewable and other energy infrastructure, detects abnormal behavior, and recommends specific maintenance actions, effectively replicating the judgment of seasoned performance engineers. Its platform already monitors and interprets signals from more than 1,000 energy sites across over 10 countries, providing context, prioritization, and natural-language interfaces such as WhatsApp for easier adoption. Operating since 2017, the company focuses on improving efficiency and reliability of existing energy assets during the energy transition. Unlike conventional monitoring dashboards, Delfos Energy delivers actionable guidance—what to do, when, and why—rather than just alerts. Management plans to use new capital to deepen deployments in key European markets, broaden into adjacent verticals like energy storage, and prepare for eventual U.S. expansion. Delfos Energy has raised €10 million to date, including the latest seed extension.

Participated · Equity · Mar 2025

Mixergy develops grid-connected smart hot water tanks that act as distributed energy storage, optimizing energy use and enabling better integration of renewable power. Its technology is said to cut hot water bills substantially (the article cites reductions up to 60% in one place and up to 40% for its top-down heating approach). The company offers hardware, software and a Mixergy App that uses machine learning to optimise consumption, and has an integrated hot-water heat pump with regulatory approval. Mixergy plans to pivot toward a technology-licensing and strategic-partnership model focused on new builds, social housing retrofits and commercial properties, and to expand R&D capabilities. It has partnerships with energy companies including British Gas and targets social housing providers, property developers, energy utilities and HVAC OEMs. The company positions its tanks to store cheap or excess renewable energy and ease grid pressure during peak demand, supporting UK net-zero goals. Mixergy was founded at Oxford University and emphasizes reducing carbon emissions while cutting household costs. Mixergy is a Cassington, UK-based developer of smart and connected hot water tanks and home energy management technologies. The company holds a suite of IP around hot water heating, heat pump and home energy management, including a patented approach that exploits thermal stratification to heat only what users need. Its smart tanks enable households to save money and reduce their environmental impact. Mixergy also connects a decentralized digital network of tanks that can provide flexibility to the grid and support the clean energy transition. Led by CEO Peter Armstrong, the company plans to use new funds to open an R&D centre at its Oxfordshire headquarters, further develop its technology, and pursue international expansion beginning in Portugal. Mixergy raised £9.2M in the disclosed funding round. Mixergy develops residential smart hot water tanks that use machine learning and engineering to heat only the water a user needs. Its tanks can save residents up to 20% on hot water bills, provide up to 30% more usable hot water, and deliver hot water up to five times faster. The product is the first hot water product certified to deliver grid‑balancing services to the UK National Grid and can be controlled via sensors and software across a national network dubbed the “Internet of Tanks.” Mixergy is a 2014 spin‑out from the University of Oxford’s Energy and Power Group and has partnered with British Gas to launch and roll out products to households. The company says it plans to expand across the UK, Western Europe and North America and to leverage low‑cost manufacturing supply chains to address a global market.

Participated · Series A · Dec 2024

Electrified Thermal Solutions develops the Joule Hive Thermal Battery (JHTB), an MIT-developed system that uses electrically and thermally conductive patented bricks to generate, store, and deliver near-flame temperatures up to 1,800°C. The JHTB is positioned to electrify industrial heat by leveraging renewable electricity to replace fossil-fuel combustion in boilers, dryers, and furnaces. The company emphasizes integration with existing infrastructure and targets sectors including cement, mining, metals, chemicals, power, and food processing. Electrified Thermal says industrial heat processes account for over 20% of global greenhouse gas emissions, making its zero‑carbon heat approach relevant to hard‑to‑abate industries. The company plans a commercial demonstration in 2025, aims to commercialize the JHTB by 2026, and targets deploying 2 GW of thermal power capacity by 2030. It raised $19 million in venture financing to accelerate its commercial demonstration, scale manufacturing, and expand its industrial customer base. Electrified Thermal Solutions builds the Joule Hive — a thermal battery made from electrically conductive 'e-bricks' doped with semiconductor materials. The bricks are heated by running electricity through them like a toaster, can store heat for hours or days, and ETS says over 95% of input electricity can be recovered as heat. A stack can reach temperatures nearing 2,000°C, enabling use in steel, glass, cement and chemical plants, as well as steam generation or power turbines. ETS says its heat is at least three times cheaper than hydrogen and can be competitive with natural gas in regions with low electricity prices or when a $50/metric-ton carbon price is applied. The company has worked with a brick maker to adapt recipes for industrial-scale equipment, is operating a pilot system about the size of an elevator, and is designing a shipping-container-scale commercial unit. ETS plans to sell either heat from the batteries or the complete system; the technology stems from about a decade of work beginning with CEO Dan Stack's graduate research at MIT. Financially, ETS has raised $4.75 million to date, including a $4.5 million seed round led by Clean Energy Ventures.

Participated · Series A · Aug 2024

Power to Hydrogen develops AEM (anion exchange membrane) electrolysis technology that converts renewable electricity and water into high‑pressure hydrogen using earth‑abundant materials. Its core product enables high current density and high‑pressure green hydrogen production while meeting industry durability requirements. The company is completing development of an industrial‑scale electrolysis stack and system for what it calls the largest AEM electrolysis stack installment in the world. Funding will support global expansion of R&D, manufacturing, sales, and marketing and growth of its U.S. team in Columbus, Ohio, plus new offices in Belgium. Rev1 Ventures and corporate partner Worthington Enterprises are backing the company, and Rev1 provides strategic services and customer collaborations alongside capital. To date Power to Hydrogen has secured over $18MM in total funding to advance commercialization of its technology.