Pressurised alkaline units that scale with demand. Order a single module or a full array, operational on site within twelve months.
Order a single module or a full array. Capacity is added in steps, so a site can start at the scale it needs and grow without redesigning the plant.
Single module
Order one unit
Multiple modules
Add capacity in steps
Full array
Order a full array
Renewable inputs and water enter the pressurised alkaline stack. Hydrogen and oxygen leave it. Biogas reforming runs as a parallel pathway to the same output.
Solar, wind, hydro, geothermal and grid power feed the system, chosen for the lowest carbon and cost at each site.
Modular PALK units split water into pure hydrogen and oxygen using clean electricity.
A modular reformer turns organic waste into low carbon hydrogen, adding a second clean pathway alongside electrolysis.
Clean hydrogen is delivered for industry, mobility and power, ready to store, blend or use on demand.
Solar
Photovoltaic fields power electrolysis with clean daytime energy.
Wind
Onshore and offshore wind add resilient, low carbon capacity.
Hydro
Hydro and grid balance the system for steady round the clock output.
Geothermal
Geothermal heat runs continuously, independent of weather or daylight.
Published figures for the electrolyser platform, grouped so they can be scanned against a specification.
| Power range | 50 kW – 20,000 kW |
|---|---|
| Technology | Pressurised Alkaline Electrolysis |
| Time to operational | Within 12 months |
| Inputs | Solar · Wind · Hydro · Geothermal · Grid |
| Stack level performance | Up to 80% (HHV) |
|---|---|
| At operating points | 0.5 A/cm², 30 barg, 70–80°C |
| System efficiency (HHV) | 69.4% |
| System efficiency (LHV) | 58.7% |
| Specific energy consumption | Competitive stack consumption metrics achieved through advanced electrode configurations |
| Hydrogen, standard delivery output | >99.999% (>5.0 Grade) |
|---|---|
| Oxygen purity | >99.7% |
| Purification | Standard onboard purification packages such as Temperature Swing Adsorption systems |
| Operating pressure | 30 barg, delivered directly from the stack |
|---|---|
| Containerisation | Rugged, pre-assembled 40-foot equivalent containerised footprints for rapid outdoor deployment with minimal civil works |
| Gateway 200 (1 MW / 200 Nm³/h) | ~155 m² |
| Gateway 400 (2 MW / 400 Nm³/h) | ~310 m² |
| Gateway 800 to 2000 Series | Scalable modular blocks extending up to 2,000 Nm³/h (10 MW) in multi-container layouts |
Hydrogen at this purity is suited to chemical feedstocks, industrial hydrogenation, zero emission transport fuels and high specification PEM fuel cell integration, without catalyst poisoning risk.
Delivering at 30 barg from the stack removes most of the downstream compression that storage and pipeline injection would otherwise require. That cuts both capital cost and the energy penalty that comes with it.
Read the manufacturer’s note on hydrogen purity (opens in a new tab)
Aurion+ deploys, integrates and operates the Gateway line. It is a turnkey, containerised range built around pressurised alkaline stacks. Capacities are fixed, and a site scales by adding containers.
| Model | Power | Output | Footprint |
|---|---|---|---|
| Gateway 200 | 1 MW | 200 Nm³/h | ~155 m² |
| Gateway 400 | 2 MW | 400 Nm³/h | ~310 m² |
| Gateway 800–2000 Series | up to 10 MW | up to 2,000 Nm³/h | multi-container layouts |
Footprints are quoted including maintenance zones.
Scalable modular blocks: capacity is added by combining containerised units, so a site can start small and grow without redesigning the plant.
40-foot equivalent containerised architecture, designed for rapid outdoor deployment with minimal civil works.
Hydrogen delivered directly from the stack at 30 barg, reducing downstream compression CAPEX and energy penalties before storage or transport.
The stack
The stack is where the split happens. Each Gateway unit is built around Stargate Hydrogen’s pressurised alkaline stacks, with the balance of plant containerised around them.
How the system works
The diagram below is the manufacturer’s scope of delivery for the Gateway 200. Power is conditioned through the transformers and rectifier, tap water is treated to ultra pure water, and the stacks split it. Liquid and gas separation sends oxygen to atmosphere and hydrogen on through the deoxo and dryer system to quality control, leaving as high quality hydrogen to a low pressure buffer.
In a project
The 10 MW pressurised alkaline electrolysis plant at Project Cendana in Peninsular Malaysia is an application of this technology.
See Project CendanaTechnology partner
Aurion+ deploys, integrates and operates Gateway systems as part of complete hydrogen production sites.
Product photography and the system diagram are courtesy of Stargate Hydrogen, and show the manufacturer’s equipment rather than an Aurion+ installation.
Stargate Hydrogen’s Gateway technology has been assessed by independent third parties. Deploying equipment that has already been tested and certified removes a category of risk from a project.
CE-Mark
CE-Mark certified across the standard Gateway turnkey product line, for deployment under European and international compliance frameworks.
The conformity mark that allows equipment to be placed on the European market.
Assessed: Stargate Hydrogen technology
Fraunhofer Institute
Stargate's electrode technology verified through independent laboratory testing.
A German applied research organisation whose laboratories carry out independent testing for industry.
Assessed: Stargate Hydrogen technology
ZSW
Gateway stacks completed industrial performance testing at the ElyLab facility in Stuttgart.
The Centre for Solar Energy and Hydrogen Research Baden-Württemberg, a German research institute for solar and hydrogen technology.
Assessed: Stargate Hydrogen technology
Demand is not concentrated in one speculative market. Hydrogen serves as a chemical feedstock, a high temperature fuel, a transport fuel and a way to store renewable energy over time.
For the wider market picture, see the International Energy Agency’s Global Hydrogen Review (opens in a new tab) and The Future of Hydrogen (opens in a new tab).
Sectors that need hydrogen as a chemical feedstock or a high temperature fuel, where electricity alone cannot do the job.
Vehicles that run too far, too heavy or too continuously for batteries to be a straightforward answer.
Hydrogen as a way to move renewable energy across time rather than only across distance.
Smaller volumes, higher purity requirements, and uses that are growing quickly from a low base.
Hydrogen bus
Depot based fleets refuel at a single point, which is why buses are among the earliest road applications.
Hydrogen train
Hydrogen rail replaces diesel on routes that have not been electrified, without the cost of wiring the line. Alstom Coradia iLint (opens in a new tab)
Published purity
>99.999% (>5.0 Grade)
The published output purity is stated as suitable for chemical feedstocks, industrial hydrogenation and zero emission transport fuels. It is also stated as suitable for high specification PEM fuel cells, without catalyst poisoning risk. That grade is what semiconductor, electronics and fuel cell applications require.
Two short explanations for anyone meeting this technology for the first time. No engineering background needed.
Water is made of hydrogen and oxygen. Pass an electric current through it and the two separate. That process is called electrolysis, and the hydrogen it releases can be burned or converted back into energy as a fuel.
Hydrogen counts as green when the electricity doing the splitting comes only from renewable sources: wind, solar, hydro or geothermal. Made that way, it is virtually free of carbon from start to finish. Most hydrogen made today comes from fossil fuels instead, which releases significant greenhouse gases.
It matters because some industries cannot simply switch to electricity. Heavy manufacturing, chemicals and long distance shipping need a fuel they can store and move. Green hydrogen gives them one, and it doubles as a way to store renewable energy and carry it across the world.
Inside each unit is a sealed cell holding a liquid that conducts electricity, called an electrolyte. Ours is potassium hydroxide. A thin barrier called a diaphragm divides the cell down the middle.
Applying an electric current splits the water. Pure hydrogen gathers on one side of the diaphragm and oxygen on the other, so the two gases are kept apart and both come out clean.
The cell runs under pressure, and that does three useful things. It stops gas bubbles forming, it keeps the equipment compact, and it delivers hydrogen that is already pressurised. Hydrogen normally has to be squeezed into a smaller volume before it can be stored or piped anywhere, which costs energy. Running the cell under pressure largely removes that step.
Modular reforming turns biomethane from organic waste into high purity hydrogen. It runs around the clock, so it complements electrolysis rather than competing with it.
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