Ok, thanks to @glyn.hudson the module disappearing issue has been fixed. If you can run EmonPi update again it should correct the link.
One you have it, you can use the ‘powertokwh’ post processor on the original power feed to rebuild the cumulative kwh use_kwh feed. Let me know if you get stuck.
I’m aware I have not yet written a guide for this module or announced its introduction on the emonpi, but I am working towards adding these resources to the openenergymonitor guide soon.