Electricity Meter Centralised Reading App Connected to all Devices at our building

What kind of solution you can make to centralise electricity meter reading? So that we would be able to know that which electricity device at our home is using how much power and how much electricity we have consumed today whole day and it should reflect on our mobile app parallely. The same reading should be read on the master meter of concerned electricity company also. Similarly when we use mobile connection and all the mobile usage is being recorded at telecom company server also and they show us our unbilled usage as well as billed usage last payment etc. Electricity company should be able to know that how many devices are connected at our building electricity meter. What kind of hardware is needed for that? Source code will be our property.