Due to technological advancements, efficiency is no longer the main issue with solar-powered street lamps. They continue to be very expensive to install. They will not likely become widely used until the prices drop. However, the concept is quickly gaining popularity, and other alternative energy sources are also being considered as alternatives as well as in conjunction with these lamps to enhance both efficiency and lower costs in the long run. See the article below for one such development involving wind-powered energy.
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