Application
Hydrogen Power Units for Backup and Emergency Power
The Challenge
Hospitals, airports, data centers, water utilities and emergency services rely on diesel backup generators, and face well-known weaknesses:
- Emissions on site — backup runs are exactly when communities are most vulnerable, yet diesel exhaust and noise appear precisely then.
- Fuel degradation and testing — diesel degrades in storage, requiring fuel polishing and mandatory load tests that burn money and emissions.
- Refuelling during outages — extended blackouts can cut off diesel deliveries, leaving critical assets without backup.
- Maintenance readiness — diesel sets need frequent starts and servicing to stay reliable over years of standby.
The Hydrogen Solution
- Instant-start fuel cells — PEM generators reach full load in seconds, meeting the same transfer requirements as diesel.
- Long-duration autonomy — stored hydrogen provides hours to days of run time, independent of fuel deliveries during an emergency.
- Zero-emission, quiet operation — safe for hospital campuses, airport aprons and dense urban sites.
- Low standby maintenance — fuel cells hold readiness with minimal servicing and no fuel degradation; hydrogen storage is inert until used.
- Hybrid with batteries — batteries cover the first seconds of a transfer; fuel cells carry the hours.
Deployment Thinking
For a hospital critical load of 500 kW with a 24-hour autonomy target, a fuel cell block of 500–600 kW plus on-site hydrogen storage replaces the diesel plant. The unit sits on the normal backup circuit with an automatic transfer switch; a small battery bank bridges the seconds before the fuel cell reaches load. For airports, modular containerised units can be distributed near terminals to shorten cable runs and improve redundancy.
Selection Advice
- Start-up and transfer — verify cold-start time and compatibility with your automatic transfer switch and UPS ride-through.
- Autonomy sizing — define the worst-case outage duration; size hydrogen storage accordingly, with margin.
- Safety and permitting — engage local authorities early on hydrogen storage siting, ventilation and fire codes.
- Total cost of ownership — compare diesel fuel polishing, testing and maintenance against hydrogen storage, stack life and service contracts over a 20-year horizon.
- Redundancy — apply the same N+1 philosophy used for diesel plants; consider splitting capacity across two units.