The SET100 List 2025

P2H2 simplifies hydrogen with hybrid liquid alkaline/AEM electrolysis, cutting stack costs by ~65% and eliminating expensive metals like iridium and platinum. Producing hydrogen at 250 bar, P2H2 reduces compression and transport costs while integrating with renewable energy. Partnering with NASA, Enel, and Shell, P2H2’s technology addresses production and storage challenges, aiming to cut 2-3% of global CO2 emissions.

Botree advances lithium battery recycling with scalable solutions for pretreatment, hydrometallurgical recycling, and material regeneration. It also innovates in hydrogen fuel cell and solid-state battery recycling, shortens laterite nickel ore separation, and complies with global standards through a life cycle assessment system, supporting sustainable EV battery management.

Cowa Thermal Solutions develops compact thermal storage systems using patented Phase Change Materials (PCMs) that are five times smaller than water-based alternatives. Targeting the growing European heat pump market, Cowa’s scalable technology enhances urban heat pump integration and renewable energy use. Successfully launched in Switzerland, Cowa aims to drive urban energy efficiency.

Cyclize turns plastic waste and CO2 into drop-in syngas, a mix of carbon monoxide and hydrogen, using a patented plasma reactor to replace natural gas. By recycling carbon from mixed plastic waste unsuitable for other methods, Cyclize reduces plastic pollution and greenhouse gas emissions. This innovative technology supports a circular economy, paving the way for a cleaner, more sustainable, and resource-efficient chemical industry.

Founded in Stuttgart in 2020 as a Fraunhofer Institute spin-off, Variolytics is a high-tech start-up revolutionising the wastewater industry. Focused on reducing greenhouse gas emissions, it provides hardware and software solutions that make the invisible measurable, enabling data-driven optimisation in treatment plants. With a team of 13, Variolytics combines cutting-edge technology and innovation to drive sustainability and impactful change.

ROSI transforms photovoltaic (PV) waste into high-value circular materials, including high-purity silicon, silver, copper, glass, and aluminium. Using advanced recycling technology, ROSI reduces reliance on virgin resources, supports decarbonisation in the solar industry, and reintegrates recycled materials into production. Through European partnerships, ROSI sets new standards for sustainability, PV waste management, and material recovery, driving a cleaner, resource-efficient future.

Concular is revolutionizing the construction industry by enabling the reuse and recycling of building materials at scale. Through its innovative software, Concular performs pre-demolition audits to identify reusable materials, increasing reuse rates from 1% to up to 80%. With over 450 buildings assessed and the creation of DIN SPEC 91484, a key industry standard in Germany, Concular is leading the shift toward a circular economy in construction, transforming waste into valuable resources while driving sustainability and cost savings.

PIONIERKRAFT is empowering small and medium-sized apartment buildings to adopt solar energy solutions through its patented technology. Since its 2019 launch, the company has sold over 1,000 units, enabling 200 solar projects that were previously unfeasible. Focused on cost reduction, the upcoming third-generation product will halve production and customer costs. By leveraging a B2B sales strategy through solar installers and housing providers, PIONIERKRAFT is helping decarbonize Germany’s housing sector, which accounts for 40% of its total housing stock.

Urbio accelerates the decarbonization of global buildings through its patentpending generative design software. The platform automates clean energy system designs for individual buildings and entire cities, reducing design times tenfold. By streamlining scattered data sources into cohesive workflows, Urbio enables energy providers and consultants to create efficient and customized solutions. Backed by a $2M pre-seed round and a 2024 seed round, Urbio is expanding its reach across Europe, driving global
energy transitions.

Nyobolt is transforming mobility with its ultra-fast charging battery technology. By developing advanced materials, it enables compact designs, exceptional cycle life, and reduced environmental impact. Ideal for EVs, hybrids, and fuel cells, Nyobolt’s batteries downsize reliance on critical materials for sustainable performance. From personal cars to fleets, Nyobolt drives cleaner, high-performance electrification.

Basquevolt develops polymer-based solid-state batteries to enable massmarket electrification. Safer and easier to produce than liquid electrolytes, their technology addresses energy density and cost challenges. With lightweight, affordable designs, Basquevolt advances sustainable solutions or applications struggling to electrify, driving a breakthrough in battery innovation for wider adoption.

Kazam unifies energy across vehicles, grids, and charge points with smart hardware and software. Its EV chargers enable real-time monitoring, grid optimization, and renewable integration, while fleet management software improves efficiency, cutting CO2 emissions. With 15,000+ chargers and partnerships like Mahindra, Kazam is advancing India’s electric mobility transition for a sustainable future.

Koolboks, based in Paris and focused on Africa, revolutionizes refrigeration with solar-powered, off-grid refrigerators featuring ice battery technology for 24/7 cooling. Affordable and accessible through a Pay-As-You-Go leaseto-own model, Koolboks also integrates USB charging to support SMEs by addressing cooling, lighting, and charging needs, fostering sustainable energy access.

RumiTech converts wind and solar into sustainable energy with its hybrid 5kW system, storing power in 2.4kW batteries for off-grid IoT-enabled solutions. Easily installable on poles in 2 hours without excavation, each unit reduces 10 tons of CO2 annually. Founded in 2023, RumiTech has raised $662,500, won awards, and delivers green energy IoT platforms for a sustainable future.

Instollar bridges Africa’s energy gap and employment challenges with a platform matching green talent to energy projects. By training local workers and facilitating over 1,500 solar projects, Instollar empowers communities with clean power, creating 500+ jobs and onboarding 900 installers. Instollar drives sustainable, inclusive energy solutions and economic growth across the continent.