The hidden fuel costs of wind generated electricity.

Two papers using German and Dutch data from Roger Pielke Sr. Blog Climate Science: :

Wind generated electricity requires back-up capacity of conventional power stations.
This capacity is required to deliver electricity to consumers when wind
supply is falling short. To have the non-wind power stations ramp up or down to compensate
for the stochastic wind variations causes extra efficiency loss for such power stations.
How much efficiency is lost in this way and how much extra fuel is required for this extra
balancing of supply and demand is unknown. In this article we attempt to make an educated guess.

The extra fuel required for the efficiency loss must be added to the fuel required
for building and installing the wind turbines and the additions to the
power cable network. While these extra requirements may be too small to notice when the
installed wind power is a small fraction of the total capacity, matters change when wind
capacity becomes significant. Based on the German situation with 23 GW of installed wind
power, we show that it becomes doubtful whether wind energy results in
any fuel saving and CO2 emission reduction. What remains are the extra investments in wind energy.

Follow the links below for the both articles:

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