Ansaldo Energia MT10 and MT20 Non-Reheat Steam Turbines
Manufacturer: Ansaldo Energia
Non-reheat steam turbines from 40 to 350 MW for combined cycle, cogeneration and industry, built for 50 and 60 Hz markets.
This model is part of SecondWatt’s steam turbine research catalogue. Specifications and price observations are included where supported by sources. Equipment availability and commercial terms require confirmation.
Ansaldo Energia MT10 and MT20 non-reheat steam turbines: 40-350 MW, up to 140 bar and 565 C, condensing or back-pressure, for 50 and 60 Hz grids.
Ansaldo Energia's non-reheat steam turbines expand steam in one pass without returning it for reheating, which Ansaldo says best suits industrial plants and small utilities. Two series are current: the MT10, a single-cylinder machine with single-flow exhaust for 40-250 MW, in condensing or back-pressure versions for small combined cycles and cogeneration; and the MT20, with two or more cylinders and double-flow low-pressure sections for 100-350 MW in medium and large combined cycles. Both take steam up to 140 bar and 565 C.
Small ratings use a compact single cylinder combining high- and low-pressure sections; larger ratings add one or more double-flow low-pressure sections. Both series share Ansaldo's 3D reaction blading, welded rotors, single-bearing design and Synchro-Self-Shifting clutch for single-shaft combined cycles. Ansaldo builds each model from pre-engineered modules for both 50 and 60 Hz markets.
Ansaldo reports more than 20 non-reheat reaction steam turbines (3 GW) built to ABB technology. Older small Ansaldo industrial turbines come from a product line Ansaldo closed in July 2000.
Why it matters
Non-reheat turbines are simpler and cheaper to integrate than reheat units, and the MT10's 40 MW floor matches the steam output of smaller combined cycles. Ansaldo offers them for both 50 and 60 Hz markets. Assessment: an AE64.3A 1+1 block (120 MW combined cycle from a 78 MW gas turbine) implies about 42 MW of steam (calculated), at the bottom of the MT10 range.
Who buys it
Owners of small and medium combined-cycle plants, including blocks behind Ansaldo's AE64.3A and AE94.2 gas turbines; industrial cogeneration plants needing back-pressure or condensing turbines; district heating and desalination plants; and solar thermal projects. Ansaldo also lists the MT10 and MT20 within its 100-800 MW small-modular-reactor range.
Role in the data center
Ansaldo publishes no steam turbine data-center project as of November 2026; its July 2026 Texas data-center order covers gas turbines only. Assessment: an MT10 could form the steam half of a combined cycle built around AE64.3A-class gas turbines, raising plant output by about half for the same fuel.
Key specifications
| MT10 power range | 40-250 MW |
|---|---|
| MT20 power range | 100-350 MW |
| Main steam pressure, MT10 and MT20, up to | 140 bar |
| Main steam temperature, MT10 and MT20, up to | 565 C |
| MT10 configuration | single cylinder, single-flow exhaust |
| MT20 configuration | two or more cylinders, double-flow LP section(s) |
| MT10 duty | condensing or back-pressure, cogeneration application |
| Non-reheat family cylinder range | 1-3 cylinders |
| Frequency markets | 50 and 60 Hz |
| Rotor and blading | welded rotor, 3D reaction blades |
| Single-shaft coupling | Synchro-Self-Shifting clutch |
| Small modular reactor range (MT10/MT20 with RT30) | 100-800 MW |
| Non-reheat reaction units built (ABB technology) | more than 20 units, 3 GW |
| AE64.3A 1+1 combined cycle / gas turbine output (steam share about 42 MW, calculated) | 120 / 78 MW |
Technical summary
Ansaldo lists the MT10 at 40-250 MW, single cylinder with single-flow exhaust, for condensing or back-pressure duty, and the MT20 at 100-350 MW with two or more cylinders and double-flow LP sections. Both accept steam up to 140 bar and 565 C. Exhaust is axial or downward for single flow and side or downward for double flow. Ansaldo does not publish last-stage blade lengths or speeds for these series as of November 2026.
Major variations
Current series are the MT10 (single cylinder, condensing or back-pressure) and the MT20 (two or more cylinders, double-flow LP). The family spans one to three cylinders. Ansaldo's earlier industrial line of smaller turbines, closed in July 2000, still appears on the used market under older type codes; those units are not MT10 or MT20 machines.
Configurations and options
Options include condensing or back-pressure exhaust with or without extractions for process steam, single-shaft arrangement with a Synchro-Self-Shifting clutch or multi-shaft layout, exhaust direction, and the matching air-cooled or hydrogen-cooled generator. Ansaldo offers service agreements, remote monitoring and spare parts.
Compatibility and dependencies
A non-reheat turbine needs a steam source (heat recovery steam generator or boiler) within 140 bar and 565 C, plus a condenser and cooling system for condensing duty, or a process steam user for back-pressure duty. Assessment: frequency is set by the generator speed, so specify 50 or 60 Hz at order.
Price evidence
Price on request. Configuration, scope and dated evidence are confirmed separately for each request.
What drives the price
Assessment: series and rating, condensing or back-pressure design, extractions, generator and condenser scope, hours and starts since the last major inspection, and blade, casing and rotor condition drive price.
Lifecycle and maintenance
Ansaldo defines minor, medium and major inspections: medium covers bearings, stop and control valves, last-stage blades and endoscopic checks; major opens all casings. It publishes no hours or starts for these intervals as of November 2026. Ansaldo offers long-term service agreements, remote monitoring, last-stage blade checks and life assessment of casings and rotors, and repairs units in Genoa.
Common failure points
- Last-stage blades — Assessment: water-droplet erosion in wet LP stages, worse at low load
- Valves — Assessment: erosion of stop and control valve seats and stems
- Casings and rotor — Assessment: thermal-fatigue cracking under frequent cycling
- Idle or stored units — Assessment: corrosion during layup without preservation
Current series or older industrial unit
- Current Ansaldo non-reheat series are the MT10, rated 40-250 MW, and the MT20, rated 100-350 MW. Ansaldo closed its older small industrial line in July 2000, so small used Ansaldo turbines with other type codes belong to that line. Check the nameplate before comparing prices.
Condensing or back-pressure
- The MT10 comes in condensing or back-pressure versions. Match the exhaust type and any extractions to the plant's power and process steam needs.
Inspection position
- Ansaldo defines minor, medium and major inspections: medium covers bearings, stop and control valves, last-stage blades and endoscopic checks; major opens all casings. It publishes no hours or starts for these intervals as of November 2026.
Compare offers on
- Series and rating — MT10 or MT20, or an older industrial type, with guaranteed output.
- Exhaust type — Condensing or back-pressure, with extractions.
- Scope — Turbine, generator, gearbox if any, condenser and controls.
- Condition — Hours, starts and last inspection findings.
Seller checklist
- Nameplate, type code and heat balance
- Operating hours and starts
- Inspection reports
- Last-stage blade checks
- Rotor and casing NDT and vibration records
- Generator test results
What sets the value
Value rests on the nameplate and heat balance, inspection reports, last-stage blade checks, rotor and casing NDT, vibration records, generator tests and service history. State whether the unit is a current MT10 or MT20 or an older industrial type.
Are Ansaldo non-reheat steam turbines available for 60 Hz?
Yes. Ansaldo states that each steam turbine model is built from pre-engineered modules for applications in both 50 and 60 Hz markets.
What sizes do the MT10 and MT20 cover?
The MT10 covers 40-250 MW with a single cylinder, and the MT20 covers 100-350 MW with two or more cylinders. Both accept steam up to 140 bar and 565 C.
Can the MT10 run as a back-pressure turbine?
Yes. Ansaldo lists the MT10 for small non-reheat combined cycles in condensing or back-pressure versions and for cogeneration.
Inspection checklist
Confirm the series (MT10 or MT20) or older type code, rating, steam conditions, exhaust type, frequency and serial numbers. Obtain hours, starts and the last inspection reports. Request last-stage blade checks, valve condition, rotor and casing NDT, vibration trends and generator test results, and for back-pressure units the process steam quality records.
Procurement channels
New units come from Ansaldo Energia, alone or within combined-cycle power islands and EPC contracts. Ansaldo publishes no list price. Small used Ansaldo turbines from the pre-2000 industrial line appear on European marketplaces; current-series units are sold with complete plants.
Regional notes
Ansaldo states its modular steam turbines serve both 50 and 60 Hz markets. Steam turbines are not combustion equipment, so plant emissions rules apply to the boiler or gas turbine, not to the turbine.