The power companies know all about the Part 15 rules. They will never
attempt to prosecute you or harass you via the FCC or Federal Courts.

You WILL find yourself in a LOCAL court room, before a LOCAL judge, and
a LOCAL District Attorney. You will be prosecuted as a “Public
Nuisance" under the same laws used to protect the public from dogs
running at large, kids who squeel their car tires, and people who leave
piles of garbage laying about.

Wouldn't it be easy to point at the back of one of the part 15 devices and
show the judge where it says the device must not cause any interfearance to
licensed devices and must accept any interferance from the licened devices ?
Then counter sue the power company for interferance and being a public
nuisance to you.