Ricoh's wind- and solar-powered Times Square billboard
Ricoh will be installing this $3 million billboard in Times Square (7th and 42nd) that will be powered entirely by wind and solar. If there's not enough sun or wind, explains the Times, the 16 floodlamps that will shine on the unit will simply...turn off.
In Times Square, a Company’s Name in (Wind- and Solar-Powered) Lights [NYTimes.com] (Thanks, Rachel!)

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I like how a lot of stories have been calling this the "greenest" billboard in Time Square. Wouldn't the greenest billboard simply not exist?
nice!
@1 Alan.
No, something that doesn't exist can't be the greenest, it can't be the biggest, smallest, tallest, cheapest, most expensive. It can't be anything if it doesn't exist.
This is a good thing. We're heading into a time when massive power stations are going to slowly become more and more redundant instead being replaced with hundreds of smaller power generators of various sorts.
Next step. Converting all the footpaths and roads in times square into kinetic energy absorbing surfaces.
Power Generating Floor.