Explode?
I don't know about exploding, but there have been multiple instances here in the not so frozen wastes of Canada and in the United States of these 'smart' meters bursting into flames because of dodgy installations. No hackers required. Although I don't think it would be that hard to get the shonky things to overload and go 'bang' if you understood how trigger the right sort of overload remotely. As someone pointed out further up the thread, their security is almost non-existent.
Because of the fire issues, in Ontario they've taken many Smart Meters out, and Saskpower in Saskatchewan has stopped using them altogether. On our side of the great divide, BC Hydro in British Columbia was ordered to remove 88,000 'Smart' Meters back in January 2016. To list but three examples.