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Because wind is cheaper. Both are intermittent in different ways, so storage needs to be solved either way.
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Because solar is too volatile. If you'd want to go full solar you would need to be able to store huge amounts energy for at least weeks. First off, there's no sun at night, so you'd need to store the energy generated during daytime for people to not sit in the dark at night. Secondly, to have enough energy in periods of bad weather you'd either need to use the energy generated earlier or have massive capacity to still generate enough energy.
Wind still blows at night, and in autumn, so it complements solar energy. To make a proper transition we really need a diverse grid, even a combination of wind and solar is not going to cut it without a major breakthrough in energy storage.
Currently, all of the 'green' energy providers still use fossil energy and compensate for it when the weather conditions allow for it. So even though in theory all of the energy used is generated in a 'green' way, they still rely on gas and/or coal.
TL;DR what tester said
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gbj_tester
Tijmen
@salad
Why are so many people / governments still insisting on making wind power work instead of focusing on solar?