The easiest thing to do here is to forget about your existing meter. Just use one of the new modbus over TCP meters and install it in series after your existing utility meter. Some of these have embedded webservers so you don't even need to do programming. see here for a rather advanced example: http://www.electroind.com/shark100s.html/
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we constantly do this kind of stuff in http://www.resourcekraft.com/
The easiest thing to do here is to forget about your existing meter. Just use one of the new modbus over TCP meters and install it in series after your existing utility meter. Some of these have embedded webservers so you don't even need to do programming. see here for a rather advanced example: http://www.electroind.com/shark100s.html/
Liam