Well despite the obvious paradox of them needing the sun to work, they would be extremely expensive, both to buy and maintain, and would be unreliable. Both qualities you really don't want in a street lamp.
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In general, solar powered garden lights won't interfere with radio signals. Solar powered garden lights incorporate a solar cell (or cells) to drive the lights in the fixtures. This is all an issue of direct current and its application. DC (direct current) doesn't generally interfere with radio signals (unless it is switched on and off rapidly, which is not going to be the case with the solar garden lights).
Unless the street lamp is a self-contained, battery-operated, solar-charged model, it almost certainly would be an ordinary AC-powered light.
Solar energy is used for heating and electricity.
Martifer Solar does it. P
I think that solar energy obtained through solar panel doesn't harm the environment.