Funny you mention Seattle City Light, have you seen their new (vulnerable) smart meters? They're fun to tango with, broadcasting with FSK modulation on 900Mhz and 2.4Ghz :3
To be clear, most smart meters employ any kind of encryption. Worse yet, the more rural areas switched to smart meters years before we did here in Seattle, meaning those utility customers have older meter models with even less protection.
Short of opting out of smart metering (which you can do), your pretty well stuck with a vulnerable meter in much of the US.
