Energy Startups

South 8 develops lithium-ion battery cells and electrolyte systems using patented liquefied gas electrolyte technology designed for extreme-temperature and defense applications. The company offers both direct-to-customer battery cells and an electrolyte injection system for cell manufacturers.

2 investors

Spark Thermionics is a company based in Berkeley, California working on thermionic energy conversion technology.

2 investors

Sparkz manufactures Cathode Active Material (CAM) for cobalt-free and nickel-free lithium iron phosphate (LFP) batteries in the United States, building a vertically integrated domestic supply chain for lithium-ion batteries. The company operates research, engineering, and manufacturing facilities in California and West Virginia.

2 investors

SPiNE provides digital control interfaces for heat pump manufacturers to meet German federal funding requirements for building efficiency, particularly enabling EEBUS protocol compliance for remote grid-responsive operation.

2 investors

SPINOR Energy develops superconducting power systems for high-power infrastructure, targeting grid, industrial, and AI-era electricity demand. The company positions its technology as a high-efficiency approach to delivering power at scale.

2 investors

Splice N Connect develops sensor hardware and analytics software for power infrastructure monitoring and management, serving the oil & gas and energy sectors. The company combines electrical engineering expertise with applied analytics to address operational challenges in energy infrastructure.

2 investors

Spur Petroleum Ltd. is a privately-owned oil and natural gas company with operations focused on the Clearwater oil play in northern Alberta. It is based in Calgary, Alberta, Canada.

2 investors

STABL Energy builds stationary industrial battery storage systems that reuse second-life electric vehicle batteries, offered as 20 ft outdoor containers and battery-hotel installations. The systems serve industrial and commercial customers for uses such as self-consumption optimization, peak shaving, and electricity trading, with cloud-based monitoring and multi-year performance guarantees.

2 investors

Starke Energy provides an integrated technical and financial platform for local smart energy systems, enabling building owners, tenants, network operators, and energy providers to trade energy and optimize local storage to reduce costs and improve flexibility.

2 investors

Starsight Energy is a clean energy company operating across Africa, backed by Helios Investment Partners and African Infrastructure Investment Managers.

2 investors

Stellaria develops the Stellarium, a molten salt nuclear reactor designed for stable, passive operation with high thermal efficiency (over 45%) and enhanced safety through underground installation and multiple containment barriers. The reactor produces electricity or high-temperature heat for industrial applications including power generation for cities and manufacturing facilities.

2 investors

Storio Energy develops and operates battery energy storage systems (BESS), using battery optimization and algorithms to support grid services such as France's secondary reserve (aFRR). The company focuses on enabling a fully low-carbon powered world and operates primarily in France.

2 investors

Strataphy provides industrial cooling services using geothermal and HVAC technologies, drawing on expertise in geology, geophysics, and mechanical/electrical engineering to serve industrial clients.

2 investors

The Canadian Strategic Missions Corporation (CSMC) is a space and defence company developing dual-use technologies through two subsidiaries: CSMC Nuclear, which builds portable micro-nuclear reactors for remote environments, and CSMC Labs, an R&D division commercializing deep-tech in quantum, robotics, nano-materials, and space systems. Its nuclear reactors serve Canadian defence, Indigenous communities, and space exploration.

2 investors

Streamline Innovations develops technologies that convert hydrogen sulfide and other pollutants from heavy industrial operations into inert, non-toxic products such as elemental sulfur fertilizer. The company serves organizations in oil and gas, renewable fuel, wastewater, and industrial sectors seeking to meet environmental performance goals and reduce emissions.

2 investors

Strobe provides software and grid-edge hardware to design, monitor, and autonomously operate distributed energy assets—batteries, solar, and generators—as a single market-aware power plant. Its platform simulates and right-sizes systems, dispatches assets in real time, and bids them into wholesale energy, capacity, and ancillary markets such as NYISO.

2 investors

Subatomic is focused on restoring domestic uranium supply in the United States.

2 investors

Sundata provides a solar panel management platform that monitors performance and detects faults across residential solar installations. The platform serves housing corporations, solar installers, and energy providers with centralized dashboards for asset management, customer service, and maintenance operations.

2 investors

Sunday Power operates at the intersection of real estate and renewable energy, serving the property sector with expertise in energy solutions. The company brings together developers, engineers, and advisors with backgrounds in technology, renewable energy, and real estate.

2 investors

Sunrock develops and finances solar energy projects across Europe, delivering renewable energy solutions to clients.

2 investors

Sunsave offers a solar subscription service that allows UK households to install solar panels and batteries through fixed monthly payments rather than upfront costs, with immediate savings on energy bills. The company aims to make solar energy more accessible and affordable to UK households.

2 investors

Sunwoda is a Chinese manufacturer of lithium-ion batteries, including consumer battery cells, EV power batteries (cells, modules, packs, and BMS), and energy storage systems. Founded in 1997, it supplies mobile phone and hybrid vehicle batteries and operates production bases in China and internationally including India, Hungary, and Thailand.

2 investors

SRS provides advisory, education, and technical support services for Commercial Property Assessed Clean Energy (C-PACE) financing, helping contractors, building owners, and mortgage holders reach consensus on energy-efficiency retrofit projects. Its offerings include contractor training, technical support tools, and project financial documentation aimed at accelerating C-PACE market adoption.

2 investors

Sustainable Bitcoin Protocol verifies clean energy sources behind Bitcoin mining and creates attestation records (SBP tokens) that enable climate-focused investment funds to hold Bitcoin while meeting ESG disclosure requirements. The company provides cryptographically verified energy data and compliance documentation aligned with SFDR, GHG Protocol, and multi-jurisdiction regulatory standards.

2 investors