Top 16 Green Energy startups in Denmark
Dec 08, 2025
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29
1
Funding: $17B
Ørsted develops, constructs and operates offshore and onshore wind farms, bioenergy plants and innovative waste-to-energy solutions and provides smart energy products to its customers.
Ørsted develops, constructs and operates offshore and onshore wind farms, bioenergy plants and innovative waste-to-energy solutions and provides smart energy products to its customers.
2
Funding: €130M
Monta is a platform for EV owners to charge seemless both at home and when away.
Monta is a platform for EV owners to charge seemless both at home and when away.
3
Aalborg CSP designs and supplies sustainable integrated solar energy systems, including high- and low-temperature energy storage systems, solar panels, heat pumps, boilers, integrated energy systems and customized Power-to-X solutions. The company has earned global leadership in CSP power plant projects. It develops parabolic trough and solar tower technology for industrial CSP applications that are an add-on to an existing energy source and can be applied to a range of applications, all essential for a wide range of industries. It matches individual energy needs with appropriate systems and technologies, integrating and combining solutions to achieve synergies across sectors and technologies.
4
Funding: $60M
Saltfoss develops the Compact Molten Salt Reactor - a smal modular reactor based on molten fluoride salt.
Saltfoss develops the Compact Molten Salt Reactor - a smal modular reactor based on molten fluoride salt.
5
Funding: $45.5M
Green Hydrogen Systems believes that electrolysers have a great potential to become a core technology in green and renewable energy.
Green Hydrogen Systems believes that electrolysers have a great potential to become a core technology in green and renewable energy.
7
Funding: $26.6M
Hyme is maturing a grid-scale thermal energy storage solution based on molten salts to greatly improve the integration of sustainable energy in the energy system.
Hyme is maturing a grid-scale thermal energy storage solution based on molten salts to greatly improve the integration of sustainable energy in the energy system.
8
Funding: €15m
Wavepiston provides a low-tech and modular system that harvests the energy in the waves to produce electricity via a standard hydropower turbine and desalinated water via a standard reverse-osmosis system.
Wavepiston provides a low-tech and modular system that harvests the energy in the waves to produce electricity via a standard hydropower turbine and desalinated water via a standard reverse-osmosis system.
10
Funding: €7.7M
Kvasir Technologies has developed a process for converting bio-waste into a fuel which can be used as a supplement, or direct replacement, for fossil fuels in large marine vessels. Crucially, there is no limit to the type of biomass that can be used as a feedstock to produce the biofuel.
Kvasir Technologies has developed a process for converting bio-waste into a fuel which can be used as a supplement, or direct replacement, for fossil fuels in large marine vessels. Crucially, there is no limit to the type of biomass that can be used as a feedstock to produce the biofuel.
11
Funding: €7.3M
Reel is setting out to fight climate change by transforming electricity procurement, offering a way for companies to buy electricity on commercially attractive terms. In addition, Reel ties companies’ electricity procurement directly to the construction of new solar and wind parks – so the renewable energy transition is further supported.
Reel is setting out to fight climate change by transforming electricity procurement, offering a way for companies to buy electricity on commercially attractive terms. In addition, Reel ties companies’ electricity procurement directly to the construction of new solar and wind parks – so the renewable energy transition is further supported.
12
Funding: €5M
Mapping the climate impact of electricity, worldwide, and in real-time.
Mapping the climate impact of electricity, worldwide, and in real-time.
13
Funding: $4.5M
NitroVolt is a green ammonia startup developing a small-scale ammonia synthesis unit, to give farmers control over fertilizer production.
NitroVolt is a green ammonia startup developing a small-scale ammonia synthesis unit, to give farmers control over fertilizer production.
14
Funding: $3.6M
Ento is an AI-powered platform that identifies the best ways to build and improve buildings in order to reduce their carbon emissions. It produces reports to display where energy has been optimised, has an alarm to alert when there’s an issue and offers a tracking space to monitor the progress of energy-saving projects.
Ento is an AI-powered platform that identifies the best ways to build and improve buildings in order to reduce their carbon emissions. It produces reports to display where energy has been optimised, has an alarm to alert when there’s an issue and offers a tracking space to monitor the progress of energy-saving projects.
15
Suncil deliveres street lights that include solar panels and can also provide streets with WiFi connectivity and air quality monitoring.
16
Green Therma a pioneering geothermal tech company has developed an innovative deep geothermal-based closed loop heating solution “Heat4EverTM” offering indefinitely CO2-free, renewable energy once installed.
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