Hydrogen powered city buses in Denmark

Project with CleanTech and Calvera. HyProvide A60 for a refueling station in Aalborg, to produce green hydrogen based on solar power.

Three hydrogen-powered buses were taken  into public transportation service in Aalborg,  Denmark in the spring of 2020 . The fuel cell  emission free electric buses are fueled by  hydrogen produced on-site at the refueling  station on a GHS HyProvide A-series based  on solar power . The hydrogen buses are estimated to save about 60,000 liters of diesel  fuel each year and reduce CO2 emissions by  some 131 tons annually.

Green Hydrogen Systems typically serves as an OEM component supplier, providing electrolyzers to companies that produce or integrate hydrogen refueling stations and other types of hydrogen-producing facilities. In this case, the company also took on the role of EPC, dimensioning the system in terms of capacity, redundancies and other factors. GHS called on Spanish partners Clan Tecnológica (Clantech) and Calvera to provide the facility’s storage, compressor and dispenser technologies.

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Key Facts

Product: HyProvide A-Series A60

Production: 130 kg H2/day

Outlet pressure: 35 bar


More about the
HyProvide A-series

HyProvide A-Series

Available in standardised, modular configurations for maximum efficiency, versatility and scalability, this next-generation technology makes the A-Series one of the most efficient alkaline electrolysers on the market. The unit is designed from the ground up to accommodate the input fluctuations that come with renewable energy sources. Its versatile design allows for application across many different market segments for green hydrogen production.

#9 reasons to choose
our electrolysers

Mature Technology

Our products are built commercially proven pressurised alkaline technology

high Efficiency

One of the most efficient solutions on the market with competitive energy to hydrogen conversion


modular solutions that
are suited for rapid scale-up, clustered solutions and serial production

Dynamic operations

The electrolysers are designed to operate handle variable
loads suitable for renewable energy


High durability (10+ year stack durability) and system uptime

High output pressure

the 35 bar hydrogen output
pressure allows for a small
product footprint and lower
compression costs

Compact Design

Small footprint due to compact modular design increasing number of applications

Sustainable process

Production process indepenent from scarce and price-sensitive materials like iridium and platinum


 Its versatile design allows for application across many different market segments for green hydrogen production.

Who do we serve



Refueling Stations


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Søren Rydbirk
CCO, Green Hydrogen Systems