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Unless you realize there's no way they're going to store enough of the sunlight-generated power to actually operate the charging station during periods of low sunlight. During those periods, they're going to use power from the grid, which might (or might not) be fuel-derived.

When the charger is fully charged, it can deliver power to the grid--thus reducing the need for fossil/nuclear fuels. That means the NET use of fuel is essentially reduced to zero.
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