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What is best option for power back up to solar powered street lights?

This time in my school’s science project competition, emphasis would be on how to introduce renewable sources of energy to our lives. So,I was just talking to my friend about the ways to make environment better and to have renewable energy dependence rather than oil. One idea that came to our mind was to give solar power backup to street lights. But we could not decide how to bring solar power backup to our streets. What is best option for power back up to solar powered street lights? Is it better to have solar panel on each and every street light or we can just keep the street lights as they are and install solar panels hubs around the city to power electrical grid? I would really appreciate your valuable response to my query. Thanks.