HomePlug Powerline Alliance already wants to tether your entire household to the Internet, and it may soon extend its reach to your garage, as well. At Computex today, the company announced that Audi, BMW, Daimler, Porsche and Volkswagen have all agreed to support its HomePlug Green PHY (GP) technology as their EV charging interface of choice. The networking specification would allow electric car owners to link their plug-ins to the Smart Grid via the same ports used to charge their batteries, opening up new, Powerline-based possibilities. Once your EV hooks up to the network, it may be able to conduct system checks in real-time, for instance, or provide instant feedback on performance or the condition of your battery. The low power GP spec will also be interoperable with HomePlug's forthcoming AV2 spec, though it's still not clear when we can expect to see Germany's automakers incorporate it into production. Zip past the break for the full PR.