Pearsall Station

Pearsall Station

Texas, USA

203 MW

Texas, commonly known as the Lone Star State, has long been a land desired by many, perennially disputed by different dwellers. Much of this is due to the plentiful natural resources available in the area, which have appeased the hunger and thirst of generation after generation since at least eight thousand years ago. Many peoples have inhabited the Texan territory, frequently fighting one another for its control – yet no one has tamed this rough environment, characterised by vast deserts, blazing winds, burning sun and mighty rivers.

Texas is nowadays home to more than 28 million people – many of whom live in dense metropolitan areas, while more than 3.5 million inhabit scattered rural settlements. The unique demographic distribution over such a wide area – the state of Texas nearly doubles the size of Germany or Japan – poses tremendous challenges on its power grid, since the amount of consumption points to be served is virtually infinite and they are situated very far away from each other. Hence, the whole power system must be kept in a delicate balance at all times.

Wärtsilä’s solution has allowed us to respond to changes in the grid when the wind stops blowing, being able to keep the plant at peak efficiency at all times thanks to the ability to dispatch the units in increments that fit our load.
John Packard, Manager of Generation, STEC


Wide and quick variation of output needs

Very tight project schedule

Unforeseable output of wind power integrated in the grid

Scarce water resources in an arid climate


Internacional combustion engines with blazing start and ramp-up rates and unrivalled load flexibility

Closed-sircuit radiator cooling

Speedy delivery and sound project coordination

Multi-unit configuration with very high efficiency at all loads


Superb dynamic capabilities and increased revenue from ancillary services market

Negligible water consumption

Delivery ahead of schedule and in budget

Enviromentlly sounder energy production trhough the inclusion of vast amounts of wind power

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Main data

   Customer   STEC (Utility)
   Type   Wärtsilä 34 gas grid stability
   Operating mode   Peak load / standby & emergency
   Gensets   24 x Wärtsilä 20V34SG 
   Total output   203 MW 
   Fuel   Natural gas
   Scope   EEQ (engineering & equipment)
   Delivered   2009

Contact us

If you want to know more about the Pearsall Station project, please contact

Dan Shelledy
Senior Business Development Manager
US, Canada & Caribbean
Wärtsilä Energy Business
Tel. +1 2812336216

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