Tampering with a metered utility is a felony in most states...
That’s why...
Would a Faraday cage be considered tampering? How about a short-range transmitter broadcasting white noise on the meter's frequency?
Given it's radio, I do wonder how secure it is. I bet in no time there's a hack to actually tamper with the signal to affect the bill.
You're not tampering with the meter or changing what it reads. Heck, if you do this, you will pay more money for power.