Germany has many large wind mills.
The gear boxes and generators are expensive.
The problem is there is no way of storing the energy.
When the wind blows there is not always a need for the power.

Here is a relatively low cost way of storing the energy.
The wind turbines are used as water pumps similar to oil pumps.
No gear box. No generator. The generator is replaced by
a simple large water tank on top of the pylon to store the energy.

The ground level water tank can be a lake. The water is recycled.

Many turbines can feed the same generator.

Paul & Robin Lamar in Germany

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