I propose a setup that would facilitate development and support of a true smart home using virtually real time power use data.
Reference links for the EDMI advanced power meters including Mk7C and Mk7A and Mk10A Mk10D and Mk10E:
The software manual really sets out the capabilities of the EDMI meters: http://www.mymeters.net/docs/default-source/ProductPdfs/edmi-atlas-software-reference-manual-revision-m.pdf
The meters can be widely configured (Did you electricity retailer tell you all the capabilities, indeed any capabilities?) for example to save use intervals down to every minute, and possibly report real time rolling use.
It seems to me that one can have the Cellular modem disconnected (There are apparently known cases where this has happened - unplug and remove it - returning to manual meter reads which the power companies still do) and then connect one's own device to the meter's serial interface and have a wealth of information thus available in real time to the home area network (HAN) over Ethernet.
Potential intermediate devices may include: https://www.perle.com/products/iolan-ds-terminal-server.shtml or http://www.bb-elec.com/Products/Ethernet-Serial-Servers-Gateways/Ethernet-Serial-Device-Servers/Vlinx-VESP211-Series-Ethernet-to-Serial-Converters.aspx or http://www.usconverters.com/rs232-ethernet-converter
My research suggests a modem cable can be installed into the meter board so long as it is insulated to mains standards. (Any reader qualified to confirm or clarify?)
Such a system seems to me to be superior to any optical connection to them meter which only gains (as pointed out earlier) use click data. It also has the benefit of reducing the possibility of remote disconnection in inappropriate circumstances or circumstances the consumer did not agree to.
Some three phase meters also have direct Ethernet connectivity e.g. the Mk11 but I am yet to find technical information on those. I understand one does not need to use all three phases of such meters so they could be used for single phase or dual phase (including ripple relays) installs.
I look forward to comments.