Why micro turbines for backup?
Data centers traditionally use diesel gensets for standby power. Gas-fired micro turbines are considered where operators want lower local emissions, fuel-flexibility (natural gas, biogas), quiet operation, or continuous/prime power capability alongside utility. Their trade-off is lower electrical efficiency and, for the smallest units, limited single-module output.
Strengths
- Low vibration, few moving parts (single rotating shaft on air bearings for some designs)
- Lower NOx/particulate vs. diesel when on natural gas
- Modular — easy to scale via paralleling
- Can run continuously (prime power / CHP)
Trade-offs
- Lower electrical efficiency than reciprocating engines
- Needs a continuous fuel supply (gas) or on-site storage
- Fast-transient response often assisted by battery/UPS
- Smallest units unsuitable alone for MW-scale loads
The candidates
Three manufacturers spanning the small-turbine range. Figures below are approximate, manufacturer-level specifications; confirm against current datasheets.
Capstone C1000S
Bladon MTG
Solar Saturn 20
Side-by-side comparison
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| Attribute | Capstone C1000S | Bladon MTG | Solar Saturn 20 |
|---|---|---|---|
| Nominal output | ~1 MW | ~12 kW | ~1.2 MW |
| Turbine category | Microturbine | Microturbine | Small gas turbine |
| Primary fuel | Natural gas / biogas | Diesel / kerosene | Natural gas / liquid |
| Oil-free air bearings | Yes | Yes | No (lube system) |
| Suited to MW-scale backup | Yes (parallel) | No | Yes |
| Modular scaling | Excellent | Good (small steps) | Moderate |
| Emissions profile (on NG) | Low NOx | Higher (liquid fuel) | Low NOx (dry low emissions available on some models) |
| Typical target market | C&I, CHP, standby | Off-grid / telecom / edge | Industrial power & oil/gas |
| Units for ~5 MW (N+1) | ~6 | Hundreds — impractical | ~5 |
"Yes/No" reflect general design characteristics of these product lines; specific variants may differ.
Sizing to a 5 MW load
A 5 MW critical load requires headroom for redundancy, startup transients, and derating from ambient temperature/altitude. Approaches differ by manufacturer scale.
Modular microturbine approach (Capstone)
- Five ~1 MW units cover the base 5 MW load.
- Add one more for N+1 redundancy (six units total).
- Battery/UPS bridges the seconds needed for turbine ramp-up.
- Failure of one module reduces capacity gracefully rather than losing all power.
- Requires reliable natural gas supply or on-site fuel handling.
Small gas-turbine approach (Solar)
- Four to five ~1.2 MW units reach 5 MW with redundancy.
- Fewer, larger machines — less parallel switchgear complexity.
- Mature aftermarket service and long field track record.
- Consider ambient derate; hot/high sites reduce rated output.
- Larger physical and acoustic footprint per unit.
Fleet sizing calculator
Estimate how many modules are needed for your critical load. This is a planning aid only — it does not account for site derate, transient sizing, or power factor.
Selection considerations
Fuel & resilience
- Natural gas dependency: is utility gas reliable during grid outages?
- On-site fuel storage vs. pipeline supply.
- Dual-fuel or liquid-fuel fallback options.
Transient & start time
- Turbines need spool-up; pair with UPS/battery for zero-gap transfer.
- Confirm cold-start and load-acceptance ratings.
Total cost of ownership
- Capital cost per kW vs. reciprocating gensets.
- Maintenance intervals and overhaul cycles.
- Fuel cost and efficiency at your typical load factor.
Frequently asked questions
Can a single micro turbine power a 5 MW data center?
No. Micro turbines are typically sub-1 MW. Meeting 5 MW requires paralleling several modules (e.g. multiple ~1 MW Capstone units) or moving to a small industrial gas turbine such as the Solar Saturn 20.