This thread is for discussion of the official integration, which at the present time does not support energy monitoring.
For discussion of anything which involves custom code, use the other thread and someone will help you there.
[OBSOLETE] [Deprecated] New TP-Link/Kasa Plug, Switch, and Bulb Integration
Be aware, though, that the SmartThings-hosted groovy cloud where custom code runs is scheduled to go away in a few months, so it’s probably not a good idea to invest a lot of time or money in solutions based on that cloud.