The new turbines are being installed near Lelystad, 40 kilometres from Amsterdam. They are due to be completed by the end of this year.
A prototype of the turbine has been running at a site near Lengerich, northern Germany since December. According to Enercon it has generated 18% more energy that the 3MW E-101 turbine already installed there.
This is 4% higher than the expected increase in output by the turbine. When the prototype was installed, Enercon said that at average wind speeds of 6.5m/s at 149 metres hub height, the E-115 should generate an annual output of roughly 9.3 million kWh - just 14% higher than the E-101's output.
Enercon's prototype was also fitted with segmented rotor blades.
The E-115, which was originally unveiled as a 2.5MW turbine, entered serial production earlier this year.
Enercon said it is now preparing to export the turbine to markets outside of Europe.
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