The turbine is located as a site in Wieringermeer in the north of the country.
GE says the machine, which is being targeted at the low-wind market, is 25% more efficient and has a 15% higher power output compared with earlier 2.5MW models.
Other features include a 139-metre tower, which GE hopes will be suitable for forested areas in Europe and Canada. It has described the machine as the "world's most efficient high-output wind turbine".
Speaking about the turbine launch, GE vice president of renewable energy Vic Abate said: "Our 2.5-120 is the first wind turbine that utilises the 'industrial internet' to help manage the intermittency of wind, providing smooth, predictable power to the world regardless of what Mother Nature throws its way."