Introducing the HPU
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The GeoPura Hydrogen Power Unit (HPU) is a self-charging battery system powered by green hydrogen, delivering zero-emission, flexible energy whenever and wherever it’s needed. Unlike conventional industrial generators, the HPU doesn’t just replace diesel, it supplements the grid, providing reliable, clean power for temporary power, back up power, off-grid applications, and peak demand support.
With zero air pollution, near-silent operation, and uninterrupted power supply, the HPU protects worker health, reduces environmental risks, and safeguards businesses from future regulatory challenges around emissions and air quality.
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HPU
The GeoPura HPU is a versatile, scalable energy system designed to deliver clean electricity without the emissions and noise of diesel generators.
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What is a HPU?
The GeoPura Hydrogen Power Unit (HPU) is an advanced hydrogen-battery hybrid system that provides clean, reliable power without reliance on fossil fuels. Unlike diesel or HVO generators, the HPU does not emit CO₂, NOx, SOx, or particulate matter, making it a safe and sustainable energy source for businesses aiming to reduce emissions and avoid air pollution liabilities.
By using green hydrogen, the HPU offers a flexible, scalable power solution that can operate off-grid, supplement grid energy, or act as a primary power source. It is ideal for high-demand applications, including construction sites, events, TV & film production, EV charging, and backup power for critical infrastructure.
Where is a HPU used?
The GeoPura Hydrogen Power Unit (HPU) is a versatile clean energy generator designed for temporary power, off-grid locations, and grid support. Whether you need generator hire for a construction site, generator rental for a live event, or a sustainable alternative to diesel for film production or EV charging, the HPU provides zero-emission, reliable power wherever it’s needed.
Learn more about how HPUs work
Find out more about how a HPU generates sustainable power here – from green hydrogen generation to clean electricity on demand. The only output is water.
Not All Power Is Created Equal
For decades, diesel generators have been the go-to solution for off-grid and backup power. But the true cost of diesel extends far beyond the fuel bill. Every litre of diesel burned releases around 2.68kg of CO₂, along with nitrogen oxides (NOx) and particulate matter (PM), air pollutants linked to asthma, cancer, cardiovascular disease, and cognitive decline. In fact, diesel generators can emit up to 40 times more NOx than modern road vehicles.
Even alternatives like HVO (hydrotreated vegetable oil), often promoted as “clean diesel,” still produce NOx and particulates, failing to address the significant public health impacts of combustion-based power.
By contrast, GeoPura’s Hydrogen Power Units (HPUs) emit only water and a little heat. That’s it. No CO₂. No NOx. No soot or smoke. Just clean, quiet electricity.
Example Weekly Emissions Savings (Based on 5,000 kWh Power Requirement):
Emissions Type
Emissions Saved Per Week (kg)
CO₂
4,875
NOx + HC
47.27
CO
25.45
Particulate Matter
1.82
HPU Benefits
Zero Emissions & Air Quality Protection
Safe & Reliable Power
Efficient & Near-Silent Operation
Future-Proof & Regulation-Ready
Did you know?
Temporary diesel generators emit up to 1,200 times more NOx and 35 times more particulate matter per kWh than the UK grid. This makes them one of the dirtiest sources of power. (Source: European Environment Agency, 2022)
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Manufactured in collaboration with Siemens Energy
The GeoPura HPU is mass-manufactured in the UK by Siemens Energy, ensuring high production quality, reliability, and scalability. This partnership enables advanced hydrogen power solutions to be deployed at scale, meeting growing demand for clean energy worldwide.
HPU
Specification
For full specifications, see the HPU Technical Spec Document
Performance
Power Output
250kW (400V, 3-phase AC, 50/60Hz)
Integrated Battery Storage
250kWh for load balancing and UPS functionality
Quiet Operation
Below 65dB external noise level at 1m distance
Fuel Source
Green hydrogen – zero emissions
Main Components
Proton Exchange Membrane Fuel Cell (PEMFC)
High-efficiency battery system
Advanced power inverters
Safe & secure remote monitoring and control features
Grid synchronisation capability (G99 compliant)
HPU
Comparison Table
The GeoPura HPU is a superior alternative to diesel generators, HVO, and standalone battery systems, offering cleaner, safer, and more adaptable power.
Emissions
Fuel Source
Reliability
Noise
Air Quality
Refuelling
Scalability
Geopura HPU
Zero
Green Hydrogen
High
Low
No Pollutants
Simple & Safe
Modular
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Why HPUs Outperform Battery-Only Systems in High-Demand Scenarios
While battery power is a great solution for short-duration or low-load applications, it falls short in high-demand, multi-day, or off-grid use cases like powering tower cranes, EV charging, or broadcast units. Standalone batteries require frequent recharging, often from the grid elsewhere, and typically can’t meet sustained load demands without excessive sizing or downtime.
GeoPura’s Hydrogen Power Units can be used to recharge on-site battery systems, extending runtime, reducing load on the grid, and enabling fully distributed, resilient energy solutions. Rather than choosing between batteries and hydrogen, you can combine them – with the HPU providing consistent power and the battery managing peaks and critical backup.
Why HPUs Are Better Than Hybrid Combustion Generators
Many Stage V hybrid generators combine batteries with diesel or HVO combustion to meet emissions limits. But this approach still burns fuel, emits pollutants, and requires regular maintenance.
GeoPura’s HPU replaces the combustion engine with a fuel cell powered by green hydrogen. It charges its onboard battery without emissions, offering a truly clean hybrid solution – silent, self-charging, and safe.
Why HVO Is Not the Answer
HVO (hydrotreated vegetable oil) is often marketed as a “cleaner” drop-in replacement for diesel, but in reality, it’s far from zero-emission. While it may reduce net CO₂ emissions under certain supply conditions, HVO still produces NOx and particulates, contributing to poor air quality and associated health risks.
In addition:
- Air pollution impacts remain – HVO still emits harmful byproducts that affect respiratory and cardiovascular health.
- Sustainability is questionable – Feedstocks like used cooking oil and palm oil can’t scale to meet growing energy needs without environmental trade-offs.
- It locks in combustion infrastructure – Investing in HVO doesn’t move your business away from outdated generator technology or toward long-term net-zero targets.
In contrast, hydrogen fuel cells eliminate all combustion – producing only water and heat, making them the truly clean, future-proof option.
Whether paired with additional external batteries, connected to the grid, or integrated with on-site solar or wind, GeoPura HPUs can intelligently work alongside other energy sources – helping you manage peak demand, optimise efficiency, and always draw from the cleanest, most cost-effective power available.
HPU Case Studies
Discover how our customers are reducing emissions, improving air quality, and delivering critical power across industries.
HPU Related Resources
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