Energy from Rain!

What do we have in plenty in West Cork?  For anyone living here at the moment, the answer comes easily to mind.  Rain, rain, rain.

http://www.physorg.com/news120216714.html

This new device can convert the energy from a falling raindrop into electricity.  Their calculation for France, and I'm sure we can do much better, is 1 Wh per square meter per year.  So if I covered my whole roof, that would be 50 Wh per year.  Would that be enough to boil a kettle? 

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