The integrated SMR + PEM fuel cell system.

The natural gas situation.

Most North American data center markets already sit on dense, well-maintained natural gas pipeline networks. Hydrogen pipelines — while expanding — are still concentrated along industrial corridors in Texas, Louisiana, and parts of California. For the majority of sites, hydrogen delivery means trucking, rail, or waiting on infrastructure that doesn't exist yet.

An integrated SMR + PEM fuel cell system flips the problem. Instead of importing hydrogen, you make it on site — from the natural gas you already have — and convert it into clean electricity through Horizon's PEM fuel cells.

How the integrated system works.

The architecture is straightforward and field-proven across decades of industrial hydrogen production:

• Pipeline natural gas enters the on-site SMR unit after desulfurization to protect downstream catalysts.
• Steam Methane Reforming reacts methane (CH₄) with steam at 800–900°C over a nickel catalyst, producing a syngas mixture of hydrogen and carbon monoxide.
• Water-Gas Shift converts the carbon monoxide into additional hydrogen and CO₂, boosting yield.
• Pressure Swing Adsorption (PSA) purifies the hydrogen to fuel-cell-grade 99.999% purity.
• Horizon PEM fuel cells convert that hydrogen into electricity at up to 54% rated power efficiency, with water vapor as the only direct byproduct.
• Optional carbon capture takes the concentrated CO₂ stream from PSA and either compresses it for sale or sequesters it — qualifying for 45Q tax credits.

System specifications.

The figures below represent a typical Horizon-scale deployment. Actual configurations are tuned to site load, fuel composition, and emissions requirements.

Module power

3 MW per Horizon PEM container; modular to 10 MW+ blocks and 100 MW+ sites

Hydrogen purity

99.999% from integrated PSA — fuel-cell-grade

Reformer temperature

800–900°C with 2.5:1 to 3:1 steam-to-carbon ratio

System efficiency

Up to 75–80% total efficiency with CHP heat recovery (electrical efficiency at the cell up to 54%)

Carbon capture

Up to 95% CO₂ capture rate from concentrated PSA off-gas stream

Deployment timeline

As low as 4 months for the fuel cell side; SMR adds modest civil work and permitting time

Footprint

Containerized fuel cell modules; SMR skid sized to site H₂ demand

Why pair on-site SMR with PEM — not a turbine?

Industrial sites have used gas turbines for distributed power for decades. So why route the same natural gas through SMR and a fuel cell instead?

Carbon math and tax credits.

Conventional grey-hydrogen SMR emits roughly 8.7–9.2 kg of CO₂ per kg of H₂ produced. With a 95% capture-rate carbon-capture system bolted on, that drops to about 0.4–0.5 kg CO₂/kg H₂ — qualifying for federal Section 45Q credits on captured CO₂ and putting on-site emissions firmly in "blue hydrogen" territory.

From the fuel cell down, the system emits only water. CO₂ from the reforming process is a concentrated, single point source — far easier to capture than diluted turbine exhaust, where capture costs balloon with the flue gas volume.

A bridge, not a destination.

The defining feature of the integrated approach is fuel flexibility. The same PEM fuel cell plant runs on grey, blue, or green hydrogen interchangeably. Today, you produce hydrogen from natural gas on site. As hydrogen pipelines reach your geography, or as your campus adds renewable electrolysis, you change the H₂ source — not the power plant. The fuel cells, balance-of-plant, electrical interconnect, and SCADA stay exactly the same.

A natural gas turbine, by contrast, is permanently a combustion asset. The path to clean power requires retiring it, not evolving it.

Sizing & engagement.

Horizon's typical engagement runs along these stages:

• Site assessment. Load profile, gas-supply capacity, water availability, footprint, redundancy targets, emissions constraints.
• System sizing. H₂ production capacity, number of PEM modules, storage buffer, optional CCS sizing.
• Permitting and interconnection. We handle CARB / EPA / local AHJ engagement; SMR adds standard industrial-gas permitting.
• Manufacturing. Containerized PEM modules ship from Horizon's Foshan factory; SMR skid sourced from partners with field-proven small-scale designs.
• Commissioning. Civil work, electrical, grid sync, load testing, handover.
• Operations. 24/7 remote monitoring, scheduled maintenance, performance guarantees.