Investment into cleantech and alternative energy innovation has surged, with global green tech financing topping over USD 2.1 trillion in 2024. This reflects unprecedented capital flows into renewable power, energy storage, and electrified transport.

Startups across the energy transition – from next-generation solar and wind technologies to hydrogen production and grid optimization – are gaining traction alongside major corporations like Orsted, NextEra Energy, and Tesla’s energy division. These ventures are critical to the global push toward net-zero emissions and expanding renewable capacity over the coming decade.

  1. Spider Green Energy Solutions (India): Smart Portable Electric Vehicle (EV) Charging Solutions
  2. REPS (Austria): Road-integrated Kinetic Energy Generation Systems
  3. Hychor (UK): Seawater-to-Green Hydrogen Production Technology
  4. Polpis Systems (USA): AI-driven Geothermal Resource Simulation Platform
  5. ATSC Solartech (Vietnam): Quartz Crucibles for High-Efficiency Solar Manufacturing
  6. UNDA (France): Wave-powered Autonomous Energy Vessels
  7. Braathens Renavia (Sweden): Green Hydrogen-based Sustainable Aviation Fuel (SAF) Production
  8. Sol Industries (Norway): Modular Micro Wind Turbine Systems
  9. Jungle Power (Australia): Portable Solar & Battery Off-Grid Power Systems
  10. Spiralis Energy (UK): Tidal & River Micro-Hydro Energy Converters

 

 

Top 10 Alternative Energy Startups Advancing Solar, Wind, Hydrogen & Storage

1. Spider Green Energy Solutions – EV Charging Infrastructure

  • Founding Year: 2025
  • Location: Hyderabad, India

Indian startup Spider Green Energy Solutions makes hardware and software products for EV charging. It manufactures a weather-proof, single-phase portable electric car charger. This supports fast charging for residential and commercial users.

Another solution, a smart mobile app, locates stations, reserves charging slots, and supports secure digital payments for drivers. It offers real-time availability and usage analytics. This supports fleet operators deploying EV infrastructure with improved accessibility.

2. REPS – Road Energy Production System

  • Founding Year: 2023
  • Location: Mils, Austria

Austrian startup REPS develops a road-integrated energy production system. The system generates electricity from the movement of vehicles on roads.

It leverages a permanent magnetic bearing energy converter to turn kinetic impulses of vehicles into electrical power. The system stores or feeds the generated electricity into the grid for local power.

Since the solution utilizes existing public roads, it generates carbon-neutral electricity without additional land requirements.

3. Hychor – Green Hydrogen

  • Founding Year: 2024
  • Location: Aberdeen, UK
  • Funding: Secured GBP 27 500 from the Scottish Funding Council

UK-based startup Hychor produces clean hydrogen from seawater. It utilizes a hydrogen seawater electrolysis technology (HySET) that leverages its proprietary seawater flow battery and electrolyzer.

The technology conducts seawater electrolysis without requiring an energy-intensive desalination process. Moreover, selecting seawater over freshwater further reduces energy consumption. The process returns seawater to the ocean without removing salts or introducing additives. This eliminates the generation of corrosive by-products.

This way, the startup reduces water treatment complexity for hydrogen producers, energy companies, plant managers, and industrial consumers.

4. Polpis Systems – Geothermal Energy Production

  • Founding Year: 2023
  • Location: North Port, FL, USA

US-based startup Polpis Systems‘ GeoFusion Energy platform models the extraction of deep geothermal power. The platform identifies geothermal heat by mapping thermal gradients and estimates the cost of extracting the heat efficiently.

Its models accurately select the right site and technology to develop geothermal energy. The platform also uses predictive analysis of thermal gradients and reservoir characteristics to reduce risk before drilling. Moreover, the open-source simulation approach drives research into penetrating hot rock zones and guides methods to harvest high-enthalpy thermal energy.

5. ATSC Solartech – Solar Energy Equipment Manufacturing

  • Founding Year: 2023
  • Location: HungYen, Vietnam

Vietnamese startup ATSC Solartech manufactures quartz cubicles. These are essential for the production of silicon crystals used in photovoltaic (PV) solar cells. The technology uses high-temperature quartz melting and precision electric furnace processes to form purified crucibles.

Automated heating control and uniform material distribution further stabilize the crucibles. Each crucible supports consistent crystal growth. It also withstands high temperature, pressure, and chemical corrosion, thus improving the performance of solar cells.

 

 

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6. UNDA – Autonomous Ship-powered Renewable Energy

  • Founding Year: 2025
  • Location: Saint-Malo, France

French startup UNDA develops an autonomous ship to convert wave energy into electricity. Leveraging artificial intelligence, the ship navigates independently and captures the movements of the sea to generate energy. It stores this energy in batteries and delivers it to the dock upon return.

The solution does not disrupt the seabed or marine biodiversity and also operates without noise and visual pollution. This makes it a sustainable energy source, especially in isolated areas like islands.

7. Braathens Renavia – Sustainable Aviation Fuel

  • Founding Year: 2024
  • Location: Bromma, Sweden

Swedish startup Braathens Renavia produces SAFs for commercial aircraft. The company utilizes carbon atoms from biomass, like wood residuals, via gasification. Another source of carbon is non-recyclable engineered waste.

It uses electrolysis-based green hydrogen to convert waste into jet fuels. This maximizes carbon usage, improving fuel output. The solution also provides a scalable alternative to limited cooking oil feedstocks used in SAFs.

8. Sol Industries – Micro Wind Turbines

  • Founding Year: 2024
  • Location: Orre, Norway

Norwegian startup Sol Industries manufactures T-Vawt micro wind turbines to generate clean wind energy. Using slipstream technology, the turbines capture wind across a wide range of speeds. This ensures consistent energy production irrespective of weather fluctuations.

The turbines feature a transitioning blade system along with neodymium magnets. This design enables the turbines to overcome centrifugal challenges. The turbines are also modular and space-efficient, enabling installation in urban locations.

Further, the startup incorporates new materials and low revolutions per minute (RPM) operation. This ensures optimal performance in strong winds as well as heavy snowfall.

9. Jungle Power – Portable Energy Generation

  • Founding Year: 2024
  • Location: Australia

Australian startup Jungle Power offers portable battery energy storage systems (ESS) for construction, events, utilities, and industrial applications. The products, J5, JKD, and J80, deliver off-grid power.

J5 suits noise-sensitive applications, and is resistant to dust and storms. J80 is an industrial-grade ESS. Its lithium-iron phosphate-based battery increases its safety profile and thermal stability.

In comparison, JKD is a solar-powered marquee made with heat-resistant materials. It uses integrated solar photovoltaic technology to capture renewable energy and power essential equipment. It also provides shelter for outdoor operations.

10. Spiralis Energy – Tidal Energy Production

  • Founding Year: 2023
  • Location: London, UK

UK-based startup Spiralis Energy develops a tidal energy converter, Axial Skelter. It incorporates a bidirectional screw-based design to convert ocean and river currents into electricity. It features embedded sensors for aquatic environment monitoring. It also doesn’t possess any sharp edges or fast-moving parts, making the design harmless to marine organisms.

Another solution, MicroBox, is a micro hydro plant that generates renewable electricity from flowing rivers. It features a plug-and-play single container for rapid setup without heavy construction. It enables power delivery in remote environments by eliminating grid dependence.

Data, Scope, and Definitions

This analysis draws on the StartUs Insights Discovery Platform, which tracks 9M+ companies, 25K+ technologies & trends, and 190M+ patents, news articles, and market reports. We screened a global pool of 27.6K+ alternative energy startups & scaleups and short-listed the companies featured here based on innovation relevance and market momentum.

We also mapped “alternative energy” to solution clusters like renewable generation, green hydrogen, energy storage, grid & infrastructure, and hard-to-abate decarbonization. Prioritized ventures showing stronger market traction signals across technology differentiation, commercial readiness, and ecosystem activity.