19 Best Energy Nuclear Startups in Helsinki to Watch in 2025

The Definitive Seedtable Ranking of Energy Nuclear Startups in Helsinki

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 19 start-ups with an aggregate funding of $369.3m. The average funding per company in this subset is $19.4m.

Last update to the database: Jun 24, 2025. See changelog.

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3

Funding Rounds

$206.0m

Money raised

Tesseract is a diversified financial services and investment management innovator in digital assets, powered by world-class technology.

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4

Funding Rounds

$48.4m

Money raised

Carbo Culture captures and sequesters carbon from agricultural waste by turning it into biochar, a material that can be used to amend soil and help plant growth.

1

Funding Rounds

$915.0k

Money raised

BroadBit is a technology company that is developing new batteries that use novel sodium-based chemistries to power the future green economy.

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1

Funding Rounds

$2.4m

Money raised

Tespack specializes in generating energy on the go. Tespack Smartpacks are wearable solar backpacks that collect energy from the sun, stores it, and then uses the power to charge devices outside people's homes. The company's goal is to make everyone energy independent and reduce their carbon footprint.

5

Funding Rounds

$22.0m

Money raised

Norsepower is a mechanical sails for large ships founded in 2012 by Tuomas Riski.

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1

Funding Rounds

$130.0k

Money raised

Kapacity.io is a Helsinki-based environmental technology company developing electricity demand response servics to reduce energy costs and emissions in residential areas.

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4

Funding Rounds

$1.5m

Money raised

Nuuka is a Helsinki-based software company developing energy management solutions for commercial and public buildings.

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2

Funding Rounds

$26.1m

Money raised

Small modular reactor (SMR) technology developer for district heating and industrial applications.

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2

Funding Rounds

$31.6m

Money raised

Cactos is a developer of smart energy storage systems founded in 2021 by Olli Nuutila.

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1

Funding Rounds

$1.6m

Money raised

Voltan Energy is a heating systems for large properties founded in 2020.

1

Funding Rounds

$2.2m

Money raised

Smart energy management solutions provider.

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1

Funding Rounds

$770.0k

Money raised

API-First EV Charging Platform integrates payment, business systems, data and electricity management with EV charging service

1

Funding Rounds

$4.7m

Money raised

Pioneering cleantech company in area of cost-effective renewable energy production and nutrient recycling from wet biomass.

1

Funding Rounds

$260.0k

Money raised

Clean energy company transforming kinetic fluid and gas energy into electrical energy.

1

Funding Rounds

$2.4m

Money raised

P2X Solutions is a green hydrogen producer founded in 2020.

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1

Funding Rounds

$2.5m

Money raised

Aeromon is an industrials emission monitoring platform founded in 2014.

1

Funding Rounds

$6.0m

Money raised

We can recover all the metal in slag and turn it into valuable sellable commodities

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1

Funding Rounds

$6.1m

Money raised

Safegrid is a grid-monitoring software founded in 2019.

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1

Funding Rounds

$3.8m

Money raised

Vensum is a power converter technology.

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