Thames Valley Viaduct and Footpath SMA9 Accommodation
Overbridge Compound – HS2 Phase 1 Project.
GeoPura hydrogen-powered generators are strategically deployed at the ‘Footpath SMA9 Accommodation Overbridge Compound’ and the ‘Thame Valley Viaduct’ sites, two critical locations in the HS2 Phase 1 project. These sites, characterised by their rural settings presented unique logistical challenges that were effectively overcome to deliver consistent, clean and reliable off-grid power.
Following the successful initial trial demonstrating that hydrogen can significantly reduce diesel usage and emissions on construction sites, the use of hydrogen technology has been extended for the entire project duration.
Dates
June 2023 – June 2024
Location
2 sites – Aylesbury
Equipment
2 x HPU
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Case Study
Key Metrics
CO2
171,458 kg
Saved
NOX
898 kg
Saved
PM
63 kg
Saved
Improvements to make
Challenges
- Reliance on diesel generators for power.
- No grid connection on site.
- Long-term solution needed across several locations.
How GeoPura helped
Solutions
- Zero Emissions: Unlike diesel generators, HPUs emit no pollutants.
- Reduced Noise: Hydrogen generators are quieter than diesel equivalents.
- Versatility: HPUs can provide heating, hot water, and fast EV charging, supporting a wide range of festival needs.
About the Project
EKFB, a joint venture comprising Eiffage, Kier, Ferrovial Construction, and BAM is responsible for delivering 80 km of the HS2 Phase 1 route. Equipped with advanced fuel cell technology, the HPU converts hydrogen gas into electricity, emitting only water vapour as a by-product. This innovative solution not only reduces the carbon footprint but also improves air quality and minimises noise pollution on construction sites.
EKFB is committed to innovative and sustainable construction practices, aligning with HS2’s goal of achieving net zero by 2035 and eliminating diesel use on all sites by 2029.
As the industry continues to seek sustainable power solutions, the success of these deployments serves as an example for future projects. With more hydrogen powered generators coming to market and the increased availability of green hydrogen, HPUs play a fundamental role in the drive towards net-zero construction practices.


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Watch how our HPU works
As the demand for clean energy continues to grow, the GeoPura HPU is a forward-thinking solution that will help companies stay ahead of the curve and meet the challenges of a rapidly changing energy landscape.
Hydrogen Power Unit (HPU) Technology
The original hydrogen-powered generator, fueled by green hydrogen. Proven, robust, and reliable, it delivers quiet, zero-emission power for a wide range of applications.
The Applications
Grid Augmentation
Off-Grid Power
Back-up Power

…The GeoPura units we have been using at our sites have been an excellent and reliable source of zero emissions power…
“Moving away from the use of diesel and other fossil fuels is a key part of EKFB’s carbon strategy, and hydrogen can play an important role in providing versatile, clean energy that reduces the carbon footprint of construction operations. As further research, development, and investment is needed to fully realise the potential of using hydrogen on construction sites, we were keen to play our part in helping to demonstrate its benefits in a live environment. The GeoPura units we have been using at our sites have been an excellent and reliable source of zero emissions power from the outset.”
Alan Silverster
EKFB Carbon Manager
Check out how we’ve powered Element 1
The project, led by BAM UK & Ireland, brings together industry leaders from across construction, hydrogen, plant hire, and research sectors, showcasing the power of collaboration in achieving net-zero ambitions.

Construction at GeoPura
Image featured:
Employees working on construction site, wearing protective equipment and discussing next construction phase