Here's the thing with LinuxMCE's Z-wave support... Devices only get supported when somebody gets one and creates a device profile, and or asks for assistance with that. That means users creating the device profiles. I honestly don't think there are a lot of people using LinuxMCE for energy management.
If you want to do this the "Easy Way"©®™ ... and I might get stoned for suggesting this,... and do what I did, which is getting a Micasaverde Vera, and using LinuxMCE as a secondary Z-wave controller. MCV Vera's thing is being "green," after all, and setting up scenes (what they call scenarios) is relatively simple on a Vera.
What you can do is get a Vera Lite, and an Aeon Labs USB stick. And then you simple follow the setup (Sarah) for activating a Z-wave controller. It means deleting your Z-wave system and rebuilding it on the Vera first,... But, It might ultimately cost you less in terms of headaches and stress. Vera definitely has support for the energy monitors and other stuff.
I've never had an issue using LinuxMCE as a secondary Z-wave controller to the Vera's primary. In fact it was the easiest thing to set up in LinuxMCE for me yet. All my work on the Vera just copied over...
Now, LinuxMCE is fully capable of doing what you want without doing it my (cheating) way,... and you'll learn a lot more going the straight LinuxMCE route,... But, my way you can save your aggravation and effort for Video or something else.