Question

why is solar energy not used widely?​

Answer 1

It is five to eleven times more expensive to produce electricity from the sun than it is from coal, hydro or nuclear sources. Solar panels use expensive semiconductor material to generate electricity directly from sunlight.

Answer 2

The technology is expensive. Whether in the form of water-heating solar panels, or photovoltaics to generate electricity from sunlight (like in the accompanying image of solar panels on the Space Station), the solar energy technology is relatively expensive compared to, say, coal-fired power plants.
Hope my answer helps you.
Please mark me as Brainliest.