We recently brought you news of a solar cell roof that can be retrofitted to a Toyota Prius that combined with an extra battery can give you some extra electric driving range. They claim the battery can provide 20 miles of electric driving range which seems highly optimistic but undoubtedly if you live in sunny climes, the solar roof can provide some benefit. The video is basically a commercial for the company so consider yourself warned.

[Source: Hugg, thanks to Linton for the tip]

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