The 18 most promising Swiss cleantech startups of 2025, according to investors

The 100 most innovative and promising Swiss startups are picked by a panel of 100 leading investors and industry experts and are revealed at the Top100 Swiss Startup Award. This year, cleantech has 18 representative startups in the Top100. We have also talked with Simone Riedel Riley, partner at Emerald Technology Ventures and managing director of the federal government's Technology Fund. Learn more about these cleantech startups setting new standards in sustainability.

The annual ranking of the Top100 Swiss Startups has become a benchmark in Switzerland’s startup ecosystem—and beyond. Every year, a panel of 100 leading investors and startup experts chooses the 100 most innovative and promising Swiss startups. Each jury member nominates 10 Swiss startups that are fewer than five years old and show the greatest commercial potential. They assign 10 points for the first place and one point for the tenth place. The companies with the most points make it into the Top100 Swiss Startup Ranking.



No reversals in sight



In light of geopolitical challenges and weak growth figures, many governments have readjusted their priorities. “The pace of egulation internationally in terms of sustainability and environmental issues has slowed noticeably,” says Simone Riedel Riley, partner at Emerald Technology Ventures and managing director of the federal government’s Technology Fund.

The cleantech sector is also feeling the effects: investment is declining. On the other hand, energy, raw materials and natural resources such as water remain scarce. “Industrial corporations are continuing to pursue their sustainability goals and are therefore interested in innovations from cleantech startups,” says Riedel Riley.

She cites the automotive industry as an example of an industry with a particularly high need for solutions. The more electric vehicles there are on the roads, the greater the mountain of discarded batteries: “This requires innovative recycling and upcycling concepts.”



Discover the 18 cleantech startups that impressed the Top100 Swiss Startup Award Jury in 2025:

DePoly, #2
DePoly recycles post-consumer PET plastic into raw components at room temperature, without additional heat or pressure.

Voltiris, #4
Voltiris develops solar modules for greenhouses, transmitting light for crops while converting the rest into renewable energy.

Bloom Biorenewables, #5
Bloom provides a sustainable alternative to petroleum, helping companies meet demand for nature-based products and sustainability goals.

Oxyle, #17
Oxyle offers a catalytic destruction technology that removes PFAS from water below detection limits, without generating secondary waste.

Enerdrape, #29 
Enerdrape turns underground structures like parking garages into renewable energy sources with prefabricated geothermal panels.

Exnaton, #33
Exnaton builds a white-label SaaS billing engine that enables utilities to create new revenue streams and support the energy transition.

Divea, #38
Divea, developed at EPFL, has created a material that captures industrial emissions directly at the source before reaching the atmosphere.

Emissium, #40
Emissium develops a granular tracking system for electricity emissions, combining data and science-based models to improve reliability.

LIBREC, #43
LIBREC processes lithium-ion battery materials of all chemistries—scrap, cells, modules, and packs—into black mass for reuse.

Unbound Potential, #45
Unbound Potential designs membrane-free redox flow batteries that enhance ion exchange through 3D optimization of electrolyte interfaces.

INERGIO Technologies, #52
INERGIO creates compact fuel cell generators that provide clean, silent, and autonomous power for off-grid and mission-critical uses.

WattAnyWhere, #64
WattAnyWhere converts ethanol into electricity, CO?, and pure water with a fuel-cell generator to address grid capacity challenges.

Mobyfly, #76
MobyFly develops zero-emission hydrofoil ferries that are fast, quiet, and consume up to 80% less energy than diesel ferries.

Verretex, #80
Verretex produces scalable high-quality fibers by sourcing and upgrading low-quality fibers from emerging recycling companies.

Perovskia Solar, #91
Perovskia Solar designs lightweight perovskite photovoltaics for IoT devices, delivering reliable power across diverse environments.

Composite Recycling, #93 
Composite Recycling transforms composite waste into reclaimed fiber and oil, with a post-treatment process enabling high-value reuse.

Grensol, #94
Grensol recycles mixed waste from cars and appliances into valuable raw materials, contributing to a more circular economy.

CLIMADA Technologies, #98
CLIMADA is an open-source global model that calculates socioeconomic impacts of weather and climate in collaboration with researchers.


Winner of the public voting
The Top100 Public Voting runs parallel to the expert jury rankings and highlights 1 outstanding Swiss startup in cleantech sector. All startups that are no older than five years and listed on startup.ch are eligible to participate. Each person with a LinkedIn profile has one vote, and the company with the most votes win. The Top100 Public Voting cleantech winner 2025 is WattAnyWhere.

The 15th edition of the Top100 Swiss Startup Award 2025 celebrated Switzerland's most promising startups. Discover the cleantech startups and all other startups in the Top100 Swiss Startup Magazine 2025 or follow the hashtag #TOP100SSU on Linkedin, Twitter, and Instagram for insights.