Ken Wilson lives alone in an apartment.
When his bill spiked a few months ago, he tried to cut back, even buying a device to tell him how many watts his appliances were using.
The bill stayed high, finally he called PG&E.
MORE: State regulators unanimously approve PG&E's 4th rate hike for 2024
Turns out, he's been paying the bill for the unit next door, possibly since 2006.
"Even after I turned off my breakers, I kept going outside to check my meter to see if it was still running and it was still running. And I couldn't believe it," Wilson said.
PG&E has owned up to the mistake, and says it is committed to making it right.
Though, it has not said exactly how.
This is probably a rare occurrence, but here's a tip just in case: the meter ID number is listed on the monthly bill, so it might be a good idea to check to make sure they match.