Ansaldo Thomassen


We’re OSP. We set power in motion.

The power of thought is a remarkable thing. A brilliant mind can easily generate great ideas. Like service solutions that benefit energy installations. That’s why we combine the engineering capacity from our OEM background with the open-mindedness of an independent service provider. Giving you sound advice and optimal service when it comes to repairing, reconditioning, upgrading or servicing GE type gas turbines.

A single source solution offering the best of both worlds. We call it OSP, Original Service Provider. A great concept to engineer power installations worldwide to new levels. Because improving our clients energy output sparks our minds as well.

Our service and sales centers are located in the Netherlands, Italy, India, Indonesia, the United Arab Emirates and Venezuela.

Field Service, Repair, Spare Parts, Conversions, Modifications and Upgrades, Training, Flexible Service Agreements, Gas Turbine Remanufacturing and Gas Turbine Relocation

2010 – Opening of Ansaldo Thomassen Gulf in Abu Dhabi (U.A.E)
2008 – Launch of new name for Thomassen Turbine Systems: Ansaldo Thomassen.
2007 – OSP™ trademark registred and launched at Powergen Europe in Madrid.
2006 – Ansaldo Energia, a Finmeccanica Company, purchase of Thomassen Turbine Systems.
2006 – Thomassen Turbine Systems celebrates its 100-years anniversary.
1999 – Establishment of BBP Turbine Services bv; former Heavy Duty Turbine Services Division of Thomassen International bv – Sole shareholder Babcock Borsig Power Service GmbH.

Thomassen International period

1996 – Thomassen International signs new Business Associate Agreement with General Electric for manufacture of Steam Turbines rated up to 150 MW.
1994 – Start of take-over of Thomassen International by Deutsche Babcock AG.
1989 – Joint venture between Thomassen Stewart and Stevenson International (TSSI) was founded; GE-type Aeroderivative Gas Turbines in the range 13 – 50 MW.
1968 – Start of building General Electric design Gas Turbines, produced under a Manufacturing Associate agreement with General Electric.
1922 – Transfer of company from Arnhem to Rheden
1906 – Foundation of NV Motoren en Machinefabriek V/H Thomassen & Co.
1896 – Thomassen started the production of his own designed gas engines.
1883 – Geurt Thomassen started a small workshop in Arnhem specializing in tools for the production of mill-stones and other windmill equipment.