I have a little toy I use to monitor the load appliances create (standby can be interesting) It uses bluetooth to link to your iThingy and then stores in a cloud account so you can track it.
Elgato Eve Socket Plug it into the wall socket then plug the device into it. It monitors the power transfer and shows you guide pricing etc.
There is also a weather sensor (outdoor) which can monitor the climate back to the account.
Elgato Weather Monitor You can then link them around your chosen settings using Homekit or integrate it with other hometoys using ITTT.
