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A comment on Solar is now cheaper than some coal, says India energy minister. Parent comment

Re:Solar is now cheaper than some coal, says India energy mi... by Intermernet on Tuesday April 19, 2016 @06:42AM (#11526050)
There are patents regarding ultrasonic cleaning of panels[1]. Not sure about actual products yet.

[1]: http://www.google.com/patents/US20120285516

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