Are you talking about street lights that collect solar power during the day and then turn on at night? Given that solar panels are decreasing in price, this could be a cost-effective option.
However, given that demand for energy during the day is higher than at night, I think that it would be best to simply hook the solar panels into the grid and let them supply power to anyone who needs it. Then, we can use wind power to run the street lights at night. Since wind is stronger at night than it is during the day, it makes sense to use it when it is available and nobody else is using electricity.
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