It's effectively what PPL did to me and a whole bunch of other people (from what I can tell) because it's only an 'estimate' and it will supposedly be corrected and we'll be credited for the future bills. They somehow glitched their estimates up badly. On top of that Natural gas rates have skyrocketed. So I'm getting hit with my biggest ever electric bill on a winter month (and with no AC usage) and then my highest ever (by far) natural gas bill in a mild winter month. Poof, there goes my whole paycheck. Pretty shocking