STAG Experience

The Power of Experience

GE has built more than 300 steam turbine-generator units totaling more than 28,000 MW of capacity for application in both reheat and non-reheat combined cycle power plants.

We have applied last-stage buckets up to 40 in (1,016 mm) at 3,600 rpm, and 42 in (1,067 mm) at 3,000 rpm, allowing for compact High Power Density™ (HPD) arrangements that complement recent increases in GE gas turbine sizes. The use of longer last-stage buckets permits a more cost-effective, compact HPD design with a minimum number of casings while providing ample exhaust annulus area for optimal thermal efficiency.

GE offers a complete line of STAG combined-cycle steam turbines that are matched to the exhaust energy of one or more GE gas turbines and Heat Recovery Steam Generators (HRSGs). HRSGs are used to convert the gas turbine exhaust into useful steam for the bottoming portion of the combined cycle. Flexibility is incorporated to allow the steam turbine design to be optimized for site-related parameters such as process extraction and condenser pressure.

Futtsu Peninsula Plant, Japan

The Futtsu Peninsula plant is one of the world's largest combined-cycle power plants, with unfired steam cycles and a 2,000 MW rating at site conditions. The power generation installation uses 14 single-shaft STAG 109E combined cycle units, each with 165 MW capacity at ISO conditions.

The single-shaft STAG configuration met the site requirements better than a multi-shaft configuration because of:

  • Minimum land requirements
  • Simplified unit controls for high reliability
  • Convenient daily start/stop operation
  • Independent units facilitate a modular maintenance program for best availability

Seoinchon Plant, Korea

The Seoinchon plant is the most efficient plant operating, with a tested gross efficiency of more than 55 percent (LHV) on natural gas fuel. It uses eight GE multi-shaft STAG 107F units (blocks 1 and 2), which have compiled nearly 200,000 hours of commercial service. Four more STAG 207FA systems, now installed as Seoinchon blocks 3 and 4, bring the total plant output to 4,000 megawatts, making Seoinchon the world's largest combined cycle facility.

Independence Station Plant, Maine, U.S.

The Independence Station plant is one of the first to use GE's structured D11 steam turbine in a combined cycle application.

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