Siemens Energy SGT-800
45-62 MW industrial gas turbine with 620 installations and overhaul intervals to 60,000 hours
Siemens Energy SGT-800 is one of 21 gas turbines tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Siemens SGT-800 dossier: 45-62 MW ratings, verified specs, 60,000-hour overhaul intervals, secondary market observations, and inspection checklist.
The Siemens Energy SGT-800 is a single-shaft industrial gas turbine built in Finspang, Sweden, launched in 1997 as the 43 MW GTX100. Five current ratings span 45.3 to 62.5 MW at 38.4 to 41.1% gross efficiency, driven through a gearbox from 6,600 rpm for 50 or 60 Hz service. Siemens reports 620 installations, more than 20 million operating hours, and 99.1% fleet reliability for 2024. The SGT-800 serves industrial CHP, district heating, and mid-size combined cycle, with 2x1 blocks reaching 180 MW at over 60% net efficiency. DLE combustion holds 15-25 ppmvd NOx with a 9 ppm option, and the machine burns up to 75% hydrogen by volume, keeping it permittable for distributed data center power. Secondary supply is thin and moves fast: three never-installed 54 MW units asking 22.52 million USD each, about 417 USD per kW, sold through Free Oilfield Quote, and a decommissioned 2007 unit listed in September 2025 drew buyer inquiries into 2026. Early-2000s units coming off first owners are the main used source, typically quoted on request.
Why it matters
The 45-62 MW class is exactly the block size distributed data center power wants, and the SGT-800 is its industrial reference: 620 units, 75% hydrogen capability, and intervals to 60,000 EOH. Siemens' gas backlog near 70 GW keeps new deliveries years out, so the handful of surplus units that surface clear quickly, as the sold 417 USD per kW never-installed lot showed.
Who buys it
Industrial CHP hosts, district energy utilities, mid-size IPPs, and data center developers assembling 50-180 MW blocks buy SGT-800s. Oil and gas operators take the mechanical-drive siblings. The trigger is Siemens' three-plus-year new-unit queue: a surplus or used unit with the 60,000-hour overhaul architecture delivers years sooner at roughly half of newbuild cost.
Role in the data center
Prime or bridge blocks of 50-62 MW per unit, paired to 100-180 MW combined-cycle islands, feeding campus medium-voltage distribution with N+1 sparing.
Key specifications
| ISO gross output, rating ladder | 45.3 / 49.9 / 55.6 / 57.0 / 62.5 MW |
|---|---|
| SC gross efficiency, top rating | 41.1 % |
| SC heat rate, 62.5 MW rating | 8759 kJ/kWh |
| CC net plant output, 2x1 | 180 MW (up to) |
| Pressure ratio range | 18.3:1-22.0:1 |
| Exhaust flow range | 115.1-137.7 kg/s |
| Exhaust temperature range | 560-596 C |
| Turbine speed | 6600 rpm |
| Architecture | 15-stage compressor, 3-stage turbine, 30 DLE burners |
| NOx with DLE on gas | 15-25 ppmvd at 15% O2 |
| Hydrogen capability | 75 % by volume (up to) |
| Overhaul interval | 60000 EOH (up to) |
| Package weight, standard / single-lift | 300000 / 305000 kg |
| Package footprint, standard | 22.4 x 7.2 x 6.6 m |
| Fleet installations | 620 units |
| Fleet reliability, 2024 | 99.1 % |
Technical summary
ISO gross output, five ratings: 45.3 / 49.9 / 55.6 / 57.0 / 62.5 MW SC gross efficiency: 38.4-41.1 % SC heat rate: 9381-8759 kJ/kWh CC net plant, 2x1: up to 180 MW above 60 % Pressure ratio: 18.3:1-22.0:1 Exhaust flow: 115.1-137.7 kg/s Exhaust temperature: 560-596 C Turbine speed: 6600 rpm, geared to 1500/1800 rpm NOx with DLE: 15-25 ppmvd, 9 ppm option Hydrogen capability: up to 75 % by volume Overhaul interval: up to 60000 EOH Package weight: 300000-305000 kg
Configurations and options
Used and surplus units appear as complete gensets with gearbox, SGen-series generator, DLE combustion, enclosure, and inlet or exhaust systems, in 50 or 60 Hz form. Options seen on the market: dual-fuel capability, 11 kV or 13.8 kV generators, single-lift packaging, and eligibility for the 56 MW upgrade.
Compatibility and dependencies
Requires a Flender-class reduction gearbox to 1,500 or 1,800 rpm, fuel gas at 27-31 bar(a), inlet filtration, and plant controls integration. DLE stability depends on fuel Wobbe control; dual-fuel units need Diesel No. 2 systems. Core exchanges and overhauls route through Siemens Finspang and authorized shops.
Pricing and availability
Trend: up A 2007-vintage 45 MW unit listed September 2025 drew buyer activity into March 2026, consistent with the 195% sector price rise Wood Mackenzie reports since 2019. Lead time, new: 36-60 months. Lead time, used or refurbished: 4-16 weeks. Warranty, used: As-is typical; Siemens LTP transfer negotiable.
Lifecycle and maintenance
Overhaul intervals extend to 60,000 equivalent operating hours with 48-hour core engine exchange available, and Siemens reports 99.1% fleet reliability for 2024 across 20 million hours. A documented 2008 unit reached 112,000 EOH before decommissioning, with turbine and gearbox replaced at 2022 refurbishment. Upgrades to the 56 MW rating are offered on eligible earlier cores; overhauls run through Finspang and authorized regional shops.
Common failure points
- Gearbox — Gear and bearing wear on high-EOH units; replaced at refurb on a 112,000 EOH unit
- DLE burners — Combustion dynamics drift and tip wear across 30-burner set
- Hot section liners — Liner cracking approaching overhaul intervals
- Compressor blading — Erosion from poor filtration or washing practice
- Controls obsolescence — Legacy control hardware on early-2000s units
Inspection checklist
EOH position — reconcile equivalent operating hours against the 60,000 EOH overhaul architecture; a unit past 50,000 EOH prices as overhaul-due Hot section — borescope combustor liners and all 30 DLE burners; document any liner cracking or burner tip distress Turbine blades — borescope 3-stage turbine for coating loss and tip rubs; reject uncoated airfoils past OEM limits Compressor — inspect 15-stage compressor for erosion and FOD; verify washing history and filter maintenance records Gearbox — inspect gear mesh and bearings; units decommissioned around 112,000 EOH have shown gearbox replacement at refurb Generator — megger stator; insulation resistance below 100 megohms warrants rewind pricing DLE tuning — require combustion dynamics and emissions data across load; verify 15-25 ppmvd NOx capability per rating Fuel system — verify 27-31 bar(a) gas supply compatibility and dual-fuel changeover function where fitted Rating identification — confirm which of the five rating versions the core represents and its upgrade eligibility Storage condition — for surplus units, verify storage per Siemens recommendations with humidity control and rotation logs Controls — confirm control system generation and Siemens support status; budget migration on pre-current systems Core exchange history — document any 48-hour core exchanges and the pedigree of the installed core Auxiliary skids — pressure-test lube oil and hydraulic systems; check enclosure fire suppression certification dates Performance test — 4-hour load run; ISO-corrected output within 5% of the applicable rating Records — complete Siemens service history, EOH accounting, and parts pedigree from COD
Procurement channels
Units surface through dealer-brokers (Free Oilfield Quote, Industrial Marine Power, American Plant and Equipment, Phoenix Equipment), European utility fleet-optimization sales, and Siemens exchange or Brownfield Engine Exchange programs. Inventory is thin; most listings resolve to price-on-request and sell before wide marketing.
Regional notes
Both 50 and 60 Hz via gearbox; the fleet concentrates in Europe, Asia-Pacific (Thailand runs one of the largest fleets), and the Middle East, so used units usually originate outside North America and ship globally. US buyers should verify 60 Hz gearbox configuration and voltage.