Cleantech Startups

Sourceful Energy finances, installs, and operates behind-the-meter battery storage and optimization software for commercial property owners and utilities, helping them reduce demand charges and participate in electricity markets. It also offers a white-label real-time energy monitoring platform for utilities, and operates in Sweden with expansion planned across the Nordics and Europe.

3 investors

SparkNano develops spatial atomic layer deposition (ALD) equipment for depositing thin nano-coatings at high speed and precursor efficiency. Its lab and fab tools serve manufacturers in the battery, solar, hydrogen, and display markets to design and mass-produce energy and display devices while reducing the use of scarce materials.

3 investors

Sparxell designs, engineers, and manufactures plant-based colorants using cellulose, including biomimetic pigments, biodegradable glitter, powders, pearls, foils, and specialty shapes such as sequins. Its products are aimed at high-end consumer product applications, offering an alternative to synthetic dyes, mica, and titania.

3 investors

SpecifX provides data enrichment for HVAC assets, turning basic nameplate data into structured, asset-level metadata such as specifications, features, and performance levels for commercial and industrial equipment. Its Decoder product serves HVAC owners, service providers, manufacturers, and technology firms for use cases like maintenance optimization, capital planning, and compliance reporting.

3 investors

Spiritus develops direct air capture (DAC) technology to remove carbon dioxide from the atmosphere and sequester it, providing a scalable and modular system for carbon dioxide removal at lower cost.

3 investors

A casino review and comparison platform that provides independent evaluations of online casinos for US players, with a focus on payment methods, security, user experience, and crypto gambling platforms.

3 investors

SpotLight provides sparse seismic monitoring for carbon capture and storage (CCS/CCUS) projects, using a single seismic source and receiver to detect subsurface changes such as CO2 presence, pressure, and fluid movement. It serves reservoir and production engineers with predictive maintenance and dynamic subsurface detection using standard acquisition equipment.

3 investors

Starlight Engine develops fusion energy technology and aims to demonstrate commercial fusion power generation using advanced superconducting tokamak (FAST) technology. The company integrates research and industry expertise to advance fusion energy toward industrial implementation and societal deployment, with focus on Japan-origin technology for global markets.

3 investors

SteamaCo provides a cloud-based, interoperable IoT smart metering (IoT-AMI) platform and turnkey solution for electricity utilities and grid operators to manage prepaid metering, monitor usage and theft, and improve revenue collection. It uses AI-driven theft detection and technical loss monitoring to help utilities reduce losses and attract investment.

3 investors

Stegra produces green steel using green hydrogen and green iron, targeting a 95% reduction in emissions compared to conventional steel production. The company serves industrial customers in the steel and heavy industry sectors seeking to decarbonize their value chains.

3 investors

StormHarvester provides AI-based, real-time analysis of rainfall and wastewater networks to help water utilities, municipalities, and environmental agencies shift from reactive to proactive network management. Its tools detect inflow and infiltration, blockages, pump station and rising main issues, spills, and support network control.

3 investors

3 investors

Strong by Form develops Woodflow, a biomimetic timber technology combining digital fabrication and computational design to produce lightweight, carbon-negative wood components that substitute for steel, concrete, and aluminum. It targets construction, mobility, mass transit, interior design, and industrial design, with applications such as building slabs, 3D cladding, and vehicle parts.

3 investors

suena energy provides AI-based software, including an "Energy Trading Autopilot" and battery digital twin, to optimize and trade electricity from battery storage systems and renewable energy assets. It serves energy asset operators and utilities, using a multi-market strategy to maximize revenues and extend battery lifespan, with a focus on the German/European electricity markets.

3 investors

Sulapac develops a biodegradable plastic alternative made from biomaterials that breaks down fully without leaving microplastics, designed for use in packaging and consumer products across industries including cosmetics and food service. The material can be processed using existing plastic manufacturing equipment, enabling companies to transition from conventional plastic to sustainable alternatives.

3 investors

Sunfire manufactures alkaline and solid oxide electrolyzers for green hydrogen production, serving industrial customers transitioning away from fossil fuels.

3 investors

Sunswap designs and manufactures electric, zero-emission transport refrigeration units (its "Endurance" product) for logistics fleets and retailers, aiming to replace diesel-based refrigeration in the cold chain. The company serves transport operators and retailers across the UK and Europe, with intelligent connected systems that provide real-time performance data.

3 investors

Supercritical sources, co-develops, and distributes carbon removal supply, including an agreement with biochar project Exomad Green for up to 500,000 tonnes through 2028. It focuses on finding and creating carbon removal projects and providing distribution to buyers.

3 investors

Superlight builds a clean-sheet, aerospace-inspired electric truck for middle-mile cargo transport, using a lightweight aluminium monocoque, software-defined controls, and by-wire architecture to improve payload and operating economics versus diesel. Its platform includes an LLM-driven fleet assistant (ALIS) for predictive maintenance and a modular production system (SPS) with an AI-enabled digital twin of the factory floor.

3 investors

Surrey H2 is developing an advanced thermochemical hydrogen generation process, combining thermochemistry and electrochemistry to produce green hydrogen at low energy cost. It targets industrial-scale and modular applications in ammonia, chemicals, steel, and fuel production.

3 investors

Swedish Algae Factory cultivates diatoms and extracts their silica shells, marketed as Algica®, a material used in high-end oceanic beauty care products and applications such as solar panel efficiency enhancement. The company runs a circular production facility in Kungshamn on the Swedish west coast that captures carbon dioxide, nitrogen, and phosphorus during cultivation.

3 investors

Swift Charge provides fully managed electric vehicle charging for property owners and businesses, handling installation and operation of EV chargers. It offers flexible financing plans ranging from zero upfront cost to full ownership.

3 investors

Swirltex builds a patented tubular membrane wastewater treatment system that uses a buoyancy-based flow pattern to channel contaminants away from the membrane, producing high-quality reusable permeate with lower energy use. Its systems are customized for industrial and agricultural wastewater applications, treating challenging waste streams for water reuse.

3 investors

Switched Source develops medium voltage power electronics devices, such as its Tie Controller and Phase-EQ products, that automate dynamic re-balancing of load across phases and distribution circuits for electric distribution utilities. Its hardware helps power system operators improve grid reliability, power quality, efficiency, and capacity for hosting renewable and distributed energy resources.

3 investors