Though a non-polluting renewable source of energy, it is not widely accepted today. here's why: When it is hot and the sun is hot, it falls on the solar ray. The heat gets converted into energy through a transformer, and gets stored in a bunch of batteries. When it is night, there is no heeat to get converted to energy, so we have to depend on the stored energy in the batteries. If the energy in the batteries run out, we won't have electricity till the sun comes out again. This goes for cars, and homes.
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Depends on what you mean by "solar energy technology" and "widely". There are certainly a large number of man made solar power converters in current use. That suggests that it is "widely" in use. But, compared to fossil energy the amount of energy created using "solar technology" is fairly minor. But what do you mean by "solar energy technology"? A hydroelectric dam is a "solar energy technology". Dams are widely used and in some places contribute the majority of the electricty.