Tendril's many energy tools (photos)
Cleabweb Hackathon sponsor already offers several options for smart-grid utility and consumer communications including hardware.

Tendril Connect
Tendril Connect has open APIs enabling it to integrate with third-party apps, and support for Windows, Linux, and Mac OS operating systems, as well as support for various mobile device platforms. It works with Tendril's line of hardware including things like smart thermostats, smart outlets, and load control switches via the ZigBee network, but can also communicate with electric cars and energy service providers.
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Tendril Insight
Tendril Home Electric Vehicle
Tendril Volt
The Tendril Volt is a three-prong outlet with a ZigBee Smart Energy communications device that can be plugged in to any standard home outlet, and used to control the appliance connected via that outlet.
Using Tendril's Energize application, the Tendril Volt outlet can then be manually set or programmed to follow guidelines such as off-peak electricity times, or a predetermined schedule.
Tendril Load Control Switch
Instead of brown-outs, utilities may in the future choose a more select approach to managing an over-taxed electric grid. The Tendril Load Control Switch would allow utilities to selectively shut off electricity-guzzling appliances like hot-water heaters, HVAC systems, and pool pumps instead of having to cut power to entire neighborhoods or homes in the face of critical peak demand.
Back to related story: Tendril opens smart-grid platform to more developers