Horizon's 5MW AEM Delivery to Rockcheck Steel Marks a Commercial First

AEM electrolysis just crossed the threshold the industry has been waiting for. Horizon Fuel Cell Technologies, a Singapore-based hydrogen company with over 20 years of experience, delivered the world's first 5-megawatt anion exchange membrane (AEM) electrolyzer system to an active steel plant on 29 April 2026. That delivery ends AEM's long stretch as a promising but unproven technology and opens its commercial era.

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What Makes AEM Different From PEM and Alkaline Electrolysis?

The electrolyzer market has long been defined by a hard trade-off. Alkaline systems are the cheapest to build but slow to respond to variable renewable input. PEM systems handle intermittent solar and wind power well but require expensive platinum-group metals, including iridium. As of 2024, typical PEM system capital costs ran approximately $2,147 per kilowatt. Alkaline came in around $1,816 per kilowatt. Both figures reflect the trade-off AEM is designed to eliminate.

AEM uses a solid polymer membrane for compact cell design, matching PEM's architecture. It runs on earth-abundant nickel and iron catalysts instead of iridium and platinum, matching alkaline's material cost profile. Horizon's AEM technology achieves efficiency gains of 15 to 20% over conventional alkaline systems and reduces total system cost by approximately 50% compared to PEM, according to the company's product documentation. The HET-A1000 can also respond to load changes in under 30 seconds from standby and operates across 10 to 110% of rated capacity, making it highly compatible with fluctuating solar and wind generation.

Green hydrogen currently costs between $4.50 and $6.00 per kilogram in Europe, according to the International Renewable Energy Agency (IRENA). Since electricity accounts for up to 60% of that production cost, efficiency improvements translate directly into a lower levelized cost of hydrogen (LCOH). Horizon targets production as low as $2 per kilogram at the Rockcheck site using the on-site 17 MW BIPV system, with a longer-term goal of reaching $1 per kilogram as manufacturing scale increases.

CAPEX figures: 2024 techno-economic industry analysis. AEM figure is a commercial-scale projection; not yet confirmed at scale.

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How Is Horizon Deploying the HET-A1000 at Rockcheck Steel?

The HET-A1000 was delivered to Rockcheck Steel Group's industrial park in Tianjin on 29 April 2026. The project is called the "Low-Carbon Smelting Project Using Green Hydrogen," contracted through Tianjin Zhonghe Energy Management Co., Ltd., a Rockcheck subsidiary. It is the world's first integrated system combining photovoltaics, AEM hydrogen production, and hydrogen-enriched blast furnace smelting in a single installation.

Two HET-A1000 units will work alongside the 17 MW BIPV system. Each unit produces 1,000 Nm³/h at 99.999% purity. That hydrogen is injected directly into Rockcheck's blast furnace gas pipeline, displacing a portion of the coal input and reducing carbon emissions without requiring a full furnace overhaul. Horizon is now finalizing commissioning of the systems with the client.

The steel sector accounts for approximately 7% of global energy-related CO₂ emissions annually, with blast furnace coal combustion as the primary source. Hydrogen enrichment is a practical entry point: it reduces coal consumption incrementally without scrapping functioning infrastructure. For AEM technology, a steel plant is the most demanding possible test environment: continuous operation, high load, strict output requirements. If the HET-A1000 performs reliably here, it validates the technology for every industrial application that follows.

HET-A1000 Specification	Value
Rated Power	5 MW per unit
Hydrogen Output	1,000 Nm³/h
H₂ Purity	99.999% (SAE J2719 / ISO 14687-2)
Stack Power Consumption	3.6 to 4.3 kWh/Nm³H₂
Operating Range	10% to 110% of rated capacity
Start Time from Standby	Less than 30 seconds
Maximum Output Pressure	1.6 MPaG
Catalyst Materials	Nickel and iron (no iridium or platinum)
Membrane Operational Life	60,000+ hours

Source: Horizon Fuel Cell Technologies official product specification, HET-A1000.

What Comes Next for Horizon and AEM Electrolysis?

With the first unit delivered and commissioning underway, Horizon has stated its ambition to ship tens of megawatts of AEM systems annually. The company has also taken early steps toward electrolyzer deployment expansion globally, including a 10-year exclusive MoU with BHEL in India to develop hydrogen train infrastructure, positioning AEM technology in one of the world's fastest-growing hydrogen markets.

Green ammonia is the sector Horizon has identified as its next AEM validation target. Ammonia production currently relies almost entirely on fossil-based hydrogen from steam methane reforming. AEM-produced green hydrogen is a direct replacement feedstock. Horizon is actively working with third parties on integrated green ammonia production schemes using AEM systems. Increasing interest in green ammonia as both a hydrogen carrier and direct fuel for shipping and power generation makes this a high-value next step.

For the broader hydrogen and decarbonization sector, the signal from Tianjin is clear. AEM electrolysis is no longer waiting for its first industrial deployment. One unit is on-site at a steel plant with a second to follow. The performance data from this installation will shape how quickly AEM scales into green ammonia, green methanol, and zero-emission transport globally.

Frequently Asked Questions

What is an AEM electrolyzer?
An AEM electrolyzer splits water into hydrogen and oxygen using electricity and a hydroxide-conducting polymer membrane. It does not require iridium or platinum catalysts, using nickel and iron-based materials instead. This significantly reduces material costs while maintaining fast dynamic response to variable renewable power input.

How does Horizon's AEM system reduce green hydrogen production costs?
The HET-A1000 reduces benchmark electrical consumption by 10 to 20% compared to conventional alkaline electrolyzers and costs approximately 50% less than comparable PEM systems, according to Horizon. Since electricity accounts for up to 60% of green hydrogen production cost, those efficiency gains directly lower the levelized cost of hydrogen (LCOH). Horizon targets a production cost as low as $2 per kilogram at the Rockcheck site.

What industries will adopt AEM electrolyzers next?
Green ammonia, green methanol, and zero-emission transport are Horizon's primary near-term targets. Green ammonia has been specifically identified by Horizon as the next sector for AEM validation at scale. The Rockcheck Steel deployment is the first commercial proof point, and the operational data from this project will drive adoption across multiple downstream applications.