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Leading technology

Proven utility steam turbines

Siemens offers a comprehensive range of steam turbine products in the power output range from 90 to 1,900 MW. These are used in conventional fossil-fired steam power plants as well as in nuclear and combined cycle power plants. With more than 8,000 steam turbines in service worldwide we provide proven technology, adapted to the specific local conditions.


Our utility steam turbines in detail

SST-3000 utility steam turbine package

Flexible steam turbine for applications in single-shaft and multi-shaft combined cycle configurations


The compact arrangement features a two-cylinder design with an axial exhaust for use in combined cycle power plants. 


The SST-3000 series covers the power output range from 90 to 250 MW. It features a separate high-pressure (HP) turbine and combined intermediate-pressure / low-pressure (IP / LP) turbine with single flow axial exhaust for 50 and 60 Hz applications.

Technical data

  • Power output 90 up to 250 MW   
    Frequency 50 or 60 Hz

  • Inlet pressure up to 177 bar / up to 2,567 psi 
  • Inlet temperature up to 565 °C / up to 1,049 ° F

  • Reheat steam conditions: Temperature up to 565 °C / up to 1,049 ° F


  • Last stage blade length:  50 Hz – 80 cm to 115 cm / 31 inches to 45 inches
    60 Hz – 76 cm to 95 cm / 30 inches to 38 inches



SST-4000 utility steam turbine package

Powerful and reliable – thanks to proven design for high efficiency


The SST-4000 series is our specialized turbine for dual-pressure, combined cycle applications. With the specialized design of the blade path, the entire power range from 100 to 380 MW can be covered with the highest reliability and availability.


Almost 40 turbines of this type are already in operation or in the commissioning stage, with a total installed capacity of approximately 7,200 MW.

The SST-4000 series consists of an intermediate-pressure and a low-pressure turbine. The installation is either high or low level arrangement with down, double-side or single-side exhaust. The turbine is able to provide process steam e. g. for industry or sea water desalination and can provide industrial heating.


Thanks to its systematically modular design, we can easily adapt the SST-4000 series to the individual operating conditions and thermal cycle of a plant. Another advantage is its fast installation, thanks to prefabricated, tested modules delivered ready for connection.

Technical data

  • Power output 100 up to 380 MW  
    Frequency 50 or 60 Hz


  • Inlet pressure up to 105 bar / up to 1,523 psi
    Inlet temperature up to 565 °C / up to 1,049 ° F


  • Last stage blade length:  50 Hz – 80 cm to 115 cm / 31 inches to 45 inches
    60 Hz – 76 cm to 95 cm / 30 inches to 38 inches



SST-5000 utility steam turbine package

Flexible condensing or back-pressure steam turbine


The SST-5000 is capable for supercritical and ultra-supercritical steam power plants. Due to its higher pressure and temperature ratings, power plant efficiency increases more than 46 percent and overall performance is improved.

In steam power plants the SST-5000 consists of a combined highpressure / intermediate-pressure turbine, and one or two low-pressure turbines. It is installed as a low- or high-level arrangement. There are various exhaust configurations available to create an optimized plant layout: down-, single-sided, and double-sided. Various extractions (up to 9 stages) create an optimized plant layout with down-, single-sided or doubles sided exhaust.

Technical data

  • Power output: CCPP – 120 to 650 MW
    SPP – 200 to 500 MW (SPP)   
  • Efficiency: CCPP – 61.5% (CCPP)
    SPP – 43% for subcritical variant, 45% for supercritical variant
  • Frequency 50 or 60 Hz


  • Main steam conditions
    CCPP – Inlet pressure up to 177 bar / up to 2,567 psi  
    Inlet temperature up to 600 °C / up to 1,112 ° F
    SPP – Inlet pressure up to 260 bar / up to 3,770 psi  
    Inlet temperature up to 600 °C / up to 1,112 ° F


  • Reheat steam conditions
    CCPP: 600 °C / 1,112 °F
    610°C / 1,130°C


  • Last stage blade length:  50 Hz – 66 cm to 142 cm / 26 inches to 56 inches
    60 Hz – 66 cm to 95 cm / 26 inches to 38 inches