Solar cells capture light from the sun and transform it into electricity - that's solar energy. Light from the sun is free, so that's good. But solar panels are dark (because they absorb the light) and heavy. In cities, where energy is most needed, where can they go? Just on roofs and unused land (very little of that in cities).
Research into better ways to capture that energy is ongoing. But it sounds like there is an innovative breakthrough taking place right now.
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