My smart meter is an OpenWay by Itron. They use 902Mhz at up to 1 watt for the communications. 902Mhz should not be a problem for the X10 system, however, if they modulate the carrier with 120Khz at times, and any X10 device rectifies the signal, random interference may result. I found that even after removing all of my command modules, I still had random on/off events occurring, mostly in the evenings. I don't use any RF remotes in my X10 system. I also noticed that the modules which had the random events were the ones closest to the power panel (smart meter). I'm considering installing an RF filter at one of the problem X10 modules to see if it will help.