I've working on a plugin for The Energy Detective 1000-Series.
Right now, it stores current kilowatt usage, today's kilowatt*hour usage, this month's kilowatt*hour usage, and current voltage. It can optionally set variables with those values.
For those who want to help test it, a direct link to the plugin is at https://github.com/jamusj/ted/zipball/v0.9.0
For those who want to access the repository, the plugin is on the indigo-5-plugin branch (https://github.com/jamusj/ted/tree/indigo-5-plugin).