Reduce diesel exposure. Lower peak demand risk. Deliver high-temperature heat where grid access is limited or unavailable.
FeX deploys on-site as modular heat infrastructure. It connects to existing diesel and renewable systems, stores surplus power, and delivers firm high-temperature heat on demand.
Offsetup to $0.30 to $1.00/kWh for delivered diesel
Up to 900ºC stable heat for operations
Bypass costly infrastructure upgrades
Firm long-duration storage and electrification
Remote sites run diesel-first power and still lack firm heat.
Containerized heat infrastructure that integrates directly into your existing energy systems.
On-site renewables, grid electricity where available, or curtailed power.
Iron-based thermochemical cells. Energy stored for days or weeks.
Up to 900°C heat via air, glycol, steam, or optional CHP.
~1/10th the physical
footprint of lithium-ion batteries.
Max output
Per container
Footprint vs Li-ion
Mine payback
Target LCOS/kWh
Remote mines with continuous thermal demand can replace diesel-fired heat using FeX behind-the-meter storage integrated into existing heat loops.
1–4 years
~$0.05/kWh
~489 kt / 30yrs
~1/10th of lithium-ion
Deploy on-site. Validate under real heat loads. Generate bankable performance data to support scale-up decisions
Pilot deployment currently underway with support from: Financed by Government of Canada
Assess system performance under real operating conditions.
Collect operational insights to inform deployment decisions.
Use validated results to define your deployment strategy.
What is FeX Energy and how does it apply to remote sites?
FeX Energy is a clean-tech company developing iron-based thermochemical energy storage that replaces diesel for heat and power at remote sites. For mining operations, the system charges from on-site renewables or grid electricity during low-cost periods and discharges sustained high-temperature heat and power on demand, without continuous fuel resupply.
What makes FeX Energy's technology better than diesel for remote heat?
Diesel energy costs at remote sites can be ten times or more higher than grid-connected equivalents once transport is factored in, it can take many litres of diesel to move a litre of diesel to an Arctic site. FeX eliminates continuous fuel logistics by storing energy in solid iron on-site, with a target levelized cost of storage around $0.05/kWh and payback periods under three years in qualifying remote configurations.
How does the iron-based energy storage system work?
Electricity drives a chemical reaction that converts iron oxide into iron, storing energy in the metal with no loss. When heat is needed, air reacts with the iron, reversing the reaction, exothermically releasing sustained high-temperature heat up to 900°C as. The iron oxide is then ready to recharge. The process is sometimes described as controlled, reversible rusting.
What kinds of energy storage durations does FeX support?
FeX systems are designed for multi-hour, multi-day to multi-week storage, a fundamental departure from battery systems optimized for only a few hours. A single 40-foot container holds approximately 10-times more energy than an equivalent Lithium Ion battery container, enabling continuous heat delivery across extended operating windows without resupply or recharge.
Can FeX integrate with an existing remote site's energy infrastructure?
Yes. The system is designed as a modular, plug-in addition to existing site infrastructure. It connects to existing heat loops, ventilation systems, and power distribution without requiring new grid connections or major civil works. Containerized units can be deployed and scaled within constrained brownfield site footprints.
What is the physical footprint compared to other storage technologies?
FeX's iron-based storage has approximately 1/10th the footprint of a comparable lithium-ion installation. High energy density per container means fewer units are needed to meet a given thermal load, which matters significantly at remote sites where space, access, and logistics cost money.
Is FeX suitable for mine-shaft heating and ventilation in underground mines?
Yes. Mine-shaft heating and underground ventilation are core use cases. FeX delivers the sustained, high-temperature heat output required to pre-condition intake air in cold climates, displacing the diesel-fired or propane-fired systems typically used for this purpose in northern mining operations.
Does the FeX system require grid connection approval or utility coordination?
In many cases, no new grid connection is required as the system can charge within available power infrastructure. The system operates behind the meter, charging from existing on-site power sources, renewable generation, existing grid tie-ins, or gensets, and discharging thermally. This avoids the permitting timelines and capital costs associated with grid upgrades or new interconnections. In a fully remote and off-grid mine, the system can pair with renewable generation in a micro-grid, delivering reliable, clean, and affordable energy.
FeX replaces diesel heat with reliable thermal energy for remote operations.
Iron-based energy storage delivering firm heat and power on demand.