The Smart Grid, a modernization and automation of the United States power grid, will potentially need millions of devices, each with their own address. Due to the relative scarcity of public IPv4 addresses and the complications of using address translators, IPv6 with its large address space for end-to-end connectivity is being considered.
For more information, see Will Smart Grid power IPv6? in Network World online.
Joe DaviesPrincipal Technical Writer for the Windows Server Networking Documentation Team