STMicroelectronics offer a complete set of semiconductor products
to implement energy, water, heat and gas meters, as well as
concentrators or multi utility controllers.
The portfolio includes
power-line modems, 8- and 32-bit microcontrollers, 32-bit
microprocessors, ASSPs for metrology, real-time clocks, EEPROMs, power
supply products and security products.
Smart grid distribution and smart meters is here.
Dedicate page to Smart Metering id here.
Smart Grid/Metering Solution part One (pdf 1M) is here and part Two (pdf 5M) is here.