Right after the keynote speech at the GridCom Forum, a panel discussed the roles of IP and IPv6. In the ICT area, IP is becoming (or has become) the protocol of choice. A consensus is forming for smart grid as well. NIST’s "Framework and Roadmap for Smart Grid Interoperability Standards, Release 1.0” lists IP as one of the standards that people can agree on.

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Baker’s talk was very convincing. In short, the original Internet stack consists of physical layers (OSI is layer 1, data link is layer 2, the Internet is layer 3, and transport is layer 4) and application layers (5, 6, and 7). But many smart grid protocols, such as ZigBee, are implemented directly on top of the link layer. Baker called this "1-2-7 architecture.” Each protocol with a different link layer must go through a gateway in order to connect to other protocols, which are also directly implemented on separate link layers. Using an abstraction of the IP layer ensures interoperability. IP is the common denominator, and it should be used in smart grid as well. 

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