Ansaldo Energia AE94.3A (V94.3A) Gas Turbines for Sale
Manufacturer: Ansaldo Energia
340 MW, 50 Hz F-class frame with an annular combustor, Ansaldo's branch of the V94.3A (SGT5-4000F), built for fast starts and cycling.
This model is part of SecondWatt’s gas turbine research catalogue. Specifications and price observations are included where supported by sources. Equipment availability and commercial terms require confirmation.
Ansaldo Energia AE94.3A (V94.3A) gas turbine: 340 MW at 40.3%, 50 Hz, 20-minute start, 15 ppm NOx, AirFlex and MXL2 upgrades and known issues.
The AE94.3A is a heavy-duty, single-shaft F-class gas turbine from Ansaldo Energia for 50 Hz grids, rated 340 MW gross at 40.3% at ISO conditions on natural gas. It has a 15-stage axial compressor with variable guide vanes, an annular combustion chamber lined with individually replaceable tiles and fitted with 24 dry low-NOx premix burners for gas and oil, a 4-stage air-cooled turbine and a cold-end generator. Ansaldo states base load in about 20 minutes, starts and stops without time limits and reliability above 99.5%. The generator can be decoupled to run as a synchronous condenser.
It belongs to the Siemens '3A' family of the mid-1990s, and POWER Magazine wrote in 2006 that the SGT5-4000F was formerly called the V94.3A. Siemens licensed its heavy-duty technology to Ansaldo from 1991 to October 2004, and a 2016 ICC award confirmed Ansaldo's right to keep using it, so the AE94.3A and SGT5-4000F are now separately developed branches; Ansaldo's upgrades are offered for both. The 60 Hz sibling, the V84.3A or SGT6-4000F, is a Siemens product. Ansaldo's 78 MW AE64.3A is a scaled-down AE94.3A.
Ansaldo's March 2025 brochure reports more than 140 units and more than 5 million EOH. Recent orders include four units for a 1 GW plant in Abu Dhabi (2025) and a 300 MW German grid-reserve plant that entered service in 2024.
Why it matters
The AE94.3A pairs F-class output with cycling flexibility: Ansaldo states base load in about 20 minutes, 30% minimum gas turbine load, 40% hydrogen blends and NOx down to 15 ppm, and its upgrade packages reach ramp rates up to 50 MW per minute. Because it shares the V94.3A frame with Siemens' SGT5-4000F, of which Siemens reports over 380 sold, parts and know-how exist on both branches. Assessment: that shared base is the main support for a used unit's service life.
Who buys it
Utilities, independent producers and grid operators in 50 Hz markets: combined-cycle plants of 495-992 MW, open-cycle peakers such as a 625 MW Tunisian plant with two units, and fast-start grid-reserve plants such as a 300 MW German unit that reaches full load in 26 minutes. Existing AE/V94.3A and SGT5-4000F owners buy Ansaldo upgrades. In October 2026 Ansaldo named AI factories and data centers among the drivers of the demand it sees.
Role in the data center
Ansaldo publishes no AE94.3A data-center project as of November 2026, though in October 2026 it named AI factories and data centers among demand drivers and cited the AE94.3A's ramp rates above 50 MW/min. Assessment: in 50 Hz markets a 340 MW open-cycle unit or a 495-992 MW combined-cycle block suits grid-parallel supply to a large campus, with fast ramping to follow load.
Key specifications
| Gross gas turbine power output, ISO, natural gas | 340 MW |
|---|---|
| Gross gas turbine efficiency, ISO, LHV | 40.3 % |
| Gas turbine exhaust mass flow | 755 kg/s |
| Gas turbine exhaust temperature | 593 C |
| Gas turbine minimum load | 30 % |
| Combined cycle 1+1 net output / efficiency | 495 / 60 MW / % |
| Combined cycle 2+1 net output / efficiency | 992 / 60.3 MW / % |
| Combined cycle net heat rate, 1+1 / 2+1 | 5,995 / 5,970 kJ/kWh |
| Combined cycle plant minimum load, 1+1 / 2+1 | 35 / 20 % |
| Frequency | 50 Hz |
| Compressor | 15-stage axial with variable guide vanes |
| Combustion system | annular chamber with replaceable tiles, 24 dry low-NOx premix burners for gas and oil |
| Turbine | 4-stage, air-cooled, axial discharge |
| Time to base load (brochure) | about 20 minutes |
| Grid frequency regulation capacity (brochure) | 50 MW/min |
| Time to full load at a German grid-reserve plant (2024) | 26 minutes |
| NOx, dry gas mode, down to | 15 ppm |
| NOx, dry oil mode / with small water amount | 60 / 25 ppm |
| Hydrogen in natural gas blends, up to | 40 % |
| Time between major overhauls, up to (depending on operation) | 5 years |
| Reliability | above 99.5 % |
| Installed units / fleet experience (March 2025 brochure) | 140+ / more than 5 million units / EOH |
| Units sold (Ansaldo authors, Modern Power Systems, September 2025) | more than 125 units |
| AirFlex compressor upgrade, gas turbine output gain, up to | 11 MW |
| Siemens V94.3A rating, 2003 | 266 MW |
Technical summary
Ansaldo Energia rates the AE94.3A at 340 MW gross and 40.3% gross efficiency at ISO conditions on 100% methane (LHV), with 755 kg/s exhaust flow at 593 C and a 30% minimum gas turbine load. A 1+1 combined cycle gives 495 MW net at 60% (5,995 kJ/kWh) and a 2+1 gives 992 MW at 60.3% (5,970 kJ/kWh), with plant minimum loads of 35% and 20%. Base load comes in about 20 minutes and the brochure gives 50 MW/min grid frequency regulation. NOx is down to 15 ppm on gas, 60 ppm on dry oil and 25 ppm on oil with water; hydrogen is up to 40%. The time between major overhauls is up to 5 years depending on operation.
Major variations
Ratings have risen over time: Power Engineering gave the Siemens V94.3A 266 MW in 2003, and Ansaldo now rates the AE94.3A at 340 MW. Ansaldo's AirFlex compressor upgrade adds up to 11 MW and applies to units up to the AE/V94.3A 'Rating 2010' and SGT5-4000F Version 7; combined with MXL2 it adds up to 30 MW and 0.5 points of efficiency, or 16,000 EOH between inspections. Autotune and the ramp-rate and MEL packages raise ramping to 50 MW/min and cut minimum environmental load by up to 35 MW. Siemens' SGT5-4000F is offered at 329 and 385 MW.
Configurations and options
Choices that change price and scope are open cycle versus 1+1 or 2+1 combined cycle; gas-only or dual fuel with diesel, high-speed diesel or naphtha; water for 25 ppm NOx on oil; hydrogen blends up to 40%; synchronous condenser operation with the generator decoupled; and upgrade packages (AirFlex, MXL2, Autotune, ramp-rate and MEL packages). Ansaldo supplies gas turbines with generators, power islands or EPC plants, and paired its 2018 Tunisian and 2025 UAE orders with long-term service agreements.
Compatibility and dependencies
The AE94.3A is built for 50 Hz only and drives its generator directly; Assessment: it is not a candidate for a 60 Hz grid, where the Siemens SGT6-4000F is the family member. Ratings are ISO on methane, so site output falls with heat, altitude and duct losses. Fuels are natural gas with up to 40% hydrogen, diesel, high-speed diesel and naphtha. Ansaldo notes that the annular combustor and its ceramic tiles make combustion tuning essential to keep instabilities within limits.
Price evidence
Price on request. Configuration, scope and dated evidence are confirmed separately for each request.
What drives the price
Assessment: rating level and upgrades installed (AirFlex, MXL2), hours and starts since the last major overhaul, combustor and hot section condition, fuel capability, scope (gas turbine-generator, power island or complete plant) and service records. For reference, Ansaldo's 2018 Tunisian EPC contracts for a 625 MW plant with two units, including service, were worth EUR 240 million, and a 2023 order for four units was reported above EUR 160 million.
Lifecycle and maintenance
Ansaldo states up to 5 years between major overhauls depending on operating conditions, vanes and blades replaceable with the rotor in place, and service agreements with upgrade packages. On one AE94.3A, ENGIE Laborelec and Ansaldo extended the interval from 33,000 to 41,000 operating hours with the insurer's agreement, and blades were in good shape afterwards. MD&A makes new V94.3A turbine parts. Ansaldo publishes no MTBF or starts-based interval as of November 2026.
Thermal and emissions profile
Ansaldo states NOx down to 15 ppm in dry gas mode, 60 ppm in dry oil mode and 25 ppm on oil with a small water flow, from 24 dry low-NOx premix burners. Two units have run on hydrogen blends up to 25% since 2006 with NOx under 15 ppm, and hydrogen is offered up to 40%. 15 ppm is about 31 mg/Nm3 as NO2 at 15% O2 (calculated); a German grid-reserve unit reports NOx below 50 mg/Nm3 on oil.
Common failure points
- Combustor ceramic tiles and holders — Combustion-noise accelerations lifted and broke tiles on early 3A units (2000); owners still report tile replacements at hot-gas-path inspections
- Combustion dynamics (humming) — Ansaldo states the annular combustor and ceramic tiles make tuning essential to keep instabilities within limits
- Turbine row 1 and 2 blades — Thermal barrier coating loss and oxidation on first-stage blades and a platform crack on a second-stage blade (2019 owner reports)
- Compressor and IGV system — IGV actuator ring wear and a trip from unexpected IGV closing traced to servomotor leakage (2019 owner reports)
- Fuel gas flexible hoses — A burner fuel hose found torn apart; hoses have no published life limit
- Exhaust expansion joint and sliding feet — An expansion joint failed after 125,000 EOH and more than 1,200 starts, with sliding feet not moving as intended
AE94.3A, V94.3A or SGT5-4000F: identify the branch
- POWER Magazine wrote in 2006 that the Siemens SGT5-4000F was formerly called the V94.3A. Since the Siemens licence ended in 2004, Ansaldo's AE94.3A and Siemens' SGT5-4000F have been developed separately, and Ansaldo's AirFlex upgrade applies to AE/V94.3A units up to Rating 2010 and SGT5-4000F units up to Version 7. Confirm the maker, rating and upgrade level on the nameplate and records.
Upgrades and what they change
- AirFlex adds up to 11 MW; AirFlex with MXL2 adds up to 30 MW and 0.5 points of efficiency, or 16,000 EOH more between inspections. Ansaldo's Autotune, ramp-rate and MEL packages raise ramping to 50 MW/min and cut minimum environmental load by up to 35 MW. Ask which packages are installed and certified.
Overhaul position
- Ansaldo states up to 5 years between major overhauls depending on operating conditions. One operator extended an AE94.3A interval from 33,000 to 41,000 operating hours with Ansaldo and its insurer. Compare the unit's hours and starts with the interval its service agreement uses.
Combustor and hot section checks
- The annular combustor's ceramic tiles and combustion tuning are the first items to check, followed by first-stage blade coatings, the IGV actuator system, fuel hoses and the exhaust expansion joint, all of which owners have reported on V94.3A units.
Compare offers on
- Branch, rating and upgrades — Ansaldo AE94.3A or Siemens V94.3A/SGT5-4000F, rating, and AirFlex, MXL2 or Autotune status.
- Overhaul position — EOH and starts since the last major overhaul against the interval in the service agreement.
- Combustor and hot section — Tile replacement history, dynamics trends and blade coating condition.
- Fuel capability — Gas-only or dual fuel, NOx guarantees per fuel, hydrogen blend limit.
- Included scope — Gas turbine-generator, power island with HRSG and steam turbine, or complete plant.
- Costs outside the offer — Dismantling, heavy transport, foundations, grid connection, emissions controls and recommissioning.
Seller checklist
- Nameplate photographs for gas turbine and generator with maker, rating and serial numbers
- EOH and starts since new and since the last major and hot-gas-path inspections
- Combustor tile replacement records and inspection reports
- Combustion dynamics trends and trip history
- Turbine and compressor borescope reports and images
- Upgrade certificates (AirFlex, MXL2, Autotune, ramp or MEL packages)
- IGV actuator, fuel hose and exhaust expansion joint records
- Emissions test results on each fuel
- Long-term service agreement history and controls documentation
- Included and excluded scope list with spares inventory
What sets the value
Value rests on records that show rating, upgrade level and remaining life: nameplate photographs, EOH and starts with the last major and hot-gas-path reports, combustor tile records and combustion dynamics trends, borescope images, upgrade certificates (AirFlex, MXL2, Autotune), emissions tests per fuel, generator test results and the long-term service agreement history.
Is the AE94.3A the same as the Siemens V94.3A or SGT5-4000F?
They share the V94.3A frame. POWER Magazine wrote in 2006 that the SGT5-4000F was formerly called the V94.3A. Siemens licensed the technology to Ansaldo from 1991 to October 2004, and since then the Ansaldo AE94.3A and the Siemens SGT5-4000F have been developed separately: Ansaldo rates the AE94.3A at 340 MW, and Siemens offers the SGT5-4000F at 329 and 385 MW.
How much power does an AE94.3A produce?
Ansaldo Energia rates it at 340 MW gross and 40.3% at ISO conditions on methane. A 1+1 combined cycle gives 495 MW net at 60% and a 2+1 gives 992 MW at 60.3%. Older units carry lower ratings.
Can an AE94.3A run at 60 Hz?
No. Ansaldo lists the AE94.3A for 50 Hz only. The 60 Hz member of the family is Siemens' SGT6-4000F, and Ansaldo's 60 Hz-capable model is the 78 MW AE64.3A, a scaled-down AE94.3A.
How fast does an AE94.3A start and ramp?
Ansaldo's brochure states base load in about 20 minutes and 50 MW/min grid frequency regulation. A German grid-reserve plant reports full load in 26 minutes and 50 MW/min, and Ansaldo ties ramp rates up to 50 MW/min to its Autotune and ramp-rate packages.
Can the AE94.3A burn hydrogen?
Ansaldo states hydrogen co-firing up to 40% by volume, with instant return to 100% methane. Two combined-cycle units have run on blends up to 25% hydrogen since 2006 with NOx below 15 ppm.
Inspection checklist
Record whether the unit is an Ansaldo AE94.3A or a Siemens V94.3A/SGT5-4000F, with rating, build year and serial numbers. Obtain EOH and starts since new and since the last major overhaul. Request combustor tile replacement records, combustion dynamics (humming) trends and trips, turbine and compressor borescope images, IGV actuator and fuel hose condition, exhaust expansion joint records, upgrades installed (AirFlex, MXL2, Autotune) and emissions tests on each fuel.
Procurement channels
New units come from Ansaldo Energia as gas turbines with generators, power islands or EPC plants, with or without long-term service agreements; Chinese units are assembled by Ansaldo's joint ventures with Shanghai Electric from Genoa-made main components. Upgrades come from Ansaldo or, for SGT5-4000F units, Siemens Energy. Ansaldo publishes no list price for the AE94.3A as of November 2026.
Regional notes
The AE94.3A is offered for 50 Hz only; 60 Hz buyers look at Siemens' SGT6-4000F. In the EU its thermal input of about 844 MW (calculated) puts it under the Industrial Emissions Directive and the large combustion plant BAT conclusions. Public orders since 2018 include the UAE, Azerbaijan, Tunisia, Germany and China. Projects financed under World Bank Group standards apply 51 mg/Nm3 (25 ppm) NOx on gas.
Content owner: Gary Martin, SecondWatt