Siemens Energy SGT6-5000F

260 MW 60 Hz F-class frame with 9 ppm NOx combustion and a fleet of more than 420 units sold

Siemens Energy SGT6-5000F is one of 21 gas turbines tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Siemens SGT6-5000F (W501F) dossier: 260 MW specs, 9 ppm NOx combustion, fleet failure points, plant-level market pricing, and inspection checklist.

The Siemens Energy SGT6-5000F is a 60 Hz F-class heavy-duty frame gas turbine, developed as the Westinghouse W501F and first operated commercially in 1993 at Florida Power and Light's Lauderdale station. The current rating is 260 MW simple cycle at 40.6% gross efficiency, 398 MW in 1x1 combined cycle at 60.5%, with more than 420 units sold and over 21 million fleet operating hours. SGT6-5000F blocks carry US and international combined-cycle baseload and capacity duty, and the fleet is a major upgrade market: Siemens ATEP packages add up to 28 MW per turbine, and Hanwha PSM supplies alternative hot-gas-path hardware rated to 32,000 equivalent baseload hours. Its 9 ppm NOx dry combustion is the lowest published in the F-class. No complete SGT6-5000F or W501F appeared on public surplus platforms in August 2026; the visible secondary market is parts, rotors, and whole-plant M&A. Recent transactions price operating F-class-era fleets at roughly 743 to 923 USD per kW (Vistra-Lotus, NRG-LS Power), with Enverus recording top PJM assets near 1,930 USD per kW.

Why it matters

With more than 420 units sold, the 5000F fleet is one of the largest 60 Hz F-class populations and the most contested aftermarket: Siemens ATEP and Hanwha PSM compete on hot-gas-path hardware, keeping parts pricing rational while whole plants reprice upward. M&A comps at 743-923 USD per kW against 2,200-3,000 USD per kW newbuild make operating 5000F fleets prime acquisition targets.

Who buys it

Utilities and IPPs buy SGT6-5000F plants for capacity markets and baseload; data center-driven acquirers now compete for the same fleets. Parts buyers, rotor shops, and operators with 501F fleets hunt surplus material through brokers such as AR Turbines. The trigger is the multi-year new-unit queue and the F-class fleet's deep, competitive aftermarket.

Role in the data center

Acquired combined-cycle capacity for campus or grid-adjacent supply: a 1x1 block delivers about 398 MW, and 2x1 fleets near 800 MW, at well below newbuild cost.

Key specifications

Technical summary

SC output: 260 MW at 40.6 % gross SC heat rate: 8870 kJ/kWh (8400 Btu/kWh) CC output 1x1: 398 MW at 60.5 % gross CC output 2x1: 798 MW at 60.6 % Pressure ratio: 19.5:1 Exhaust flow: 587 kg/s Exhaust temperature: 589 C Shaft speed / frequency: 3600 rpm / 60 Hz NOx on gas: 9 ppmvd or lower without water injection Start: 10 minutes turning gear to 95% load, ramp to 40 MW/min Hydrogen capability: up to 30 % by volume Fleet: more than 420 units sold, over 21 million hours

Configurations and options

Fleet units run in 1x1 and 2x1 combined-cycle blocks and some simple-cycle peakers. Configuration variables on the aftermarket: FD2 versus FD3 hot sections, ULN combustion conversions reaching 9-12 ppm NOx, water-injection oil capability, and rotor generation. Rotors, cases, and full hot-gas-path sets trade as discrete assets.

Compatibility and dependencies

Single-shaft 60 Hz machine on heavy foundations with high-pressure fuel gas and plant-integrated controls. Parts interchange depends on generation (FD2/FD3/F5); ULN and FlameSheet combustion systems have distinct fuel and tuning requirements. Rotor overhauls run through Siemens, Sulzer, and other shops with published 12-rotor-class experience.

Pricing and availability

Comparable secondary-market band: 743–1930 $ per kW. Trend: up Unit-level asks are absent, but plant-level comps stepped up sharply: Vistra's 2025 Lotus fleet purchase priced about 743 USD per kW, NRG-LS Power about 923 USD per kW, and Enverus recorded top PJM assets near 1,930 USD per kW in October 2025 with sector multiples roughly doubling since 2024. Newbuild replacement at 2,200-3,000 USD per kW anchors the ceiling. Lead time, new: 36-60 months. Lead time, used or refurbished: 6-18 months. Warranty, used: As-is; parts carry vendor terms (OEM or PSM).

Lifecycle and maintenance

Siemens reports over 99% fleet reliability across 21 million hours. Hot-gas-path life extends to 32,000 equivalent baseload hours and 900 equivalent starts with Hanwha PSM GTOP6 hardware; Siemens ATEP modernization adds up to 28 MW and cuts heat rate by up to 572 Btu/kWh. 501FD2 rotors (32 ft, 54 tons) overhaul through Sulzer-class shops; published rotor design life in EOH is not available and remaining-life accounting drives valuation.

Common failure points

• Compressor thru-bolts (early units) — Fractures initiating in threaded sections between rows
• R1 blade seal-pin slots — Hard-pack debris shifts blade frequency, enabling HCF fracture
• Exhaust manifolds and struts — Chronic cracking under cycling; severed struts documented
• Row 3/4 turbine hardware — Blade, vane, and ring-segment damage; distorted shroud platforms
• IGV mechanisms — Sticking and freeze-up at low ambient
• Generator main leads — Brazed-joint failures

Inspection checklist

Compressor thru-bolts — on pre-F(4) units, verify inspection history for threaded-section fractures between compressor rows R1 compressor blades — inspect seal-pin slots for hard-pack debris that alters blade frequency; documented HCF fracture driver Exhaust system — inspect manifolds, cylinders, and all struts for cracking; two of six struts severed within 5 months at one plant Row 3 turbine hardware — check shroud platforms for distortion and ring segments for damage per 2022 users-group reporting Row 4 blade tips — measure tip clearances against baseline; drift within 5 months of prior readings flags active distress IGVs — cycle inlet guide vanes; verify bushing lubrication and freeze-protection where ambient reaches -2 F Rotor — audit hours and starts; 501FD2 rotor overhauls have found circumferential cracks at stage pilots with corrosion pitting Hot gas path position — reconcile against interval, up to 32,000 EBH / 900 starts with PSM GTOP6 hardware Combustion system — identify DLN versus ULN conversion; ULN units should demonstrate 9-12 ppm NOx with stable CO Generator main leads — X-ray brazed joints; one plant inspects every outage after in-service failures Water injection (oil fuel) — pressure-test skid if dual fuel is claimed; verify 25 ppmvd oil-fire compliance Controls — confirm control system generation and support; budget migration on pre-T3000 systems Performance — ISO-corrected output within 5% of the 260 MW class rating and heat rate within 3% Emissions train — SCR catalyst age and ammonia slip under permit where fitted Records — complete outage history, rotor life accounting, and parts pedigree (OEM versus PSM) for every hot-gas-path set

Procurement channels

Whole-plant M&A dominates; loose W501F/SGT6-5000F material trades through parts brokers (AR Turbines), aftermarket suppliers (Hanwha PSM, EthosEnergy), and rotor shops (Sulzer). No complete units were listed on public surplus platforms in August 2026; F-class-era plant offerings surface through Repowering Solutions and advisor-run processes.

Regional notes

60 Hz machine concentrated in North America with additional fleets in the Middle East, Asia, and Latin America. US fleet is the epicenter of both the upgrade aftermarket (ATEP versus PSM) and data center-driven plant acquisitions.