Wind turbines produce electricity which is delivered to the grid. Variations in wind velocity cause yield variations. Conventional power stations are forced to compensate these variations by adjusting their output. This has a negative effect on the efficiency of the latter stations. Using data provided by CBS, the Dutch Institute for Statistics, an estimate is made of the so called "turning point". This is the point where the efficiency reduction of conventional power stations balances out the fuel saving of the wind turbines, and where the CO2 emission reduction turns negative as well. In the Netherlands the data for the year 2007 show this to be the case at an efficiency reduction of all power stations of about 2 %. The Dutch government uses an incorrect formula for calculating the fuel and emission saving from wind energy. On this subject parliament has been incorrectly advised by government.
In addition, fuel costs required for initial installation of wind turbines are substantial.
Application of wind energy without adequate buffer and storage facilities serves no green purpose.