whisky-dave formulated the question :
Dont; forget this 1000 would actualy be millions as most housholds have
electricity and teh plan is for tehm all to be smartmeters.
So see if yuo can calculate the sort of bandwidht needed to up load millions
of users data within a few minutes.

Why all within a few minutes, that makes no sense at all. All that is
needed is the data to be uploaded once per day and at anytime when
capacity is available. Likely that will be over night.

24 x 2 x 7 digits plus meter details and checksum, per customer - is
not really a lot of data.