Surge in Electric Bill

My Forte 4a class A hot amp raises my electric bill $10.00 a month if left on all the time (it is)
Your one component could raise your bill $20 if it runs hot as the devil in totally pure class A and you left it on all the time.
You got some other problem...

There must be something else going on too. Is your neighbor plugging his motorhome into an outlet on your house? There is no way that the Cary (unless there was something seriously wrong with it, and even then???) would do that to the power bill. Has it been colder than normal?

it happened to me.. review bill sometimes they only do a calculated or intelligent guess and they do actual meter reading every other month to save dollars..

You could always go on the budget plan [if offered] where you pay the same each month for a year. But month 13 often brings an "adjustment". YOU better open that one!