Still in its infancy, but Sony is currently working on FeliCa-based power outlets that would (theoretically) allow airports and cafes to require payments (via NFC) if you want to plug in your device. I wouldn't doubt that there's market for this, primarily because it wouldn't require a significant effort and it's like finding money on the street (for the merchants). Using the power line as a network is nothing new, and with the introduction of NFC on several handhelds already you could potentially be required to "authenticate" with the outlet and agree to some sort of micro-payment before your device would charge. http://www.theverge.com/2012/2/14/2796971/sony-authenticating-power-outlets-charge-nfc I think of it as a parking meter... you could pay a certain amount (as long as it's somewhat reasonable) for the convenience of using the space (in this case the outlet). Good and bad, because the idea of paying to charge your device sounds alien to most people, but I'm certain that if this actually picks up you'd see an outlet every 3 feet at every airport.