The Current Cost electricity monitor is probably the most hacker-friendly energy monitor, spitting out data over a serial line in XML at periodic intervals and supporting simple add-on modules. This projects combines a Current Cost meter with a Roving Networks WiFly module, a set of thermistors, and an Arduino. The WiFly module is trivial to configure once you know what configuration you need, so much so that you can configure it to combine data received over a serial line with a pre defined HTTP post!
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