Maybe it is not smart in the sense of smart grids but it is a big step in the internet of things: networked lightbulbs. The Dutch energy company Nuon (Vattenfal) is selling them (rather expensively), based on the technology from GreenWave Reality. Philips is also selling it’s HUE lightbulbs. Both use the JenNet-IP protocol: technology from NXP semiconductors. See the links below.
Greenwave Reality link:
Philips Hue website (overdone design :-):