We have a small cabin 12x20, which averages $20 per month for power.
Last month we were billed $691 for one month's usage. The power company, Green Mtn Power, found no fault with the meter.

Could a surge in the supply line cause the meter to run fast, thereby increasing the
monthly charge?

WOW, that's high. It would have to surge a long time! Were they estimating the other bills? what is the cost for a KW? Did you leave a heater on high?

Or someone tapped into your line.
Or the Electric co really did screw up and can't be bothered to admit it, or to find the cause.
Do you live there?

I would tell them that you are contesting it (in writing) and why. It sounds like you were paying for the whole street!

Thanks for the reply. KwH cost is .1484 and .433 per day. They were estimating, but this is the actual billed charge.

MA0641: If the power surged could it make the meter spin faster and thus run up the charge?

JOYPULV: The electric company is not user friendly. They sent someone to check the meter, but he said it was okay.
My niece lives, as a guest, in the building. She keeps her electric heater down when she's at work; her dog doesn't mind. I think Green Mtn Power
Screwed up. We will contest the charge in writing.

$20 per month for electric heat--cooking? Hot water?? Is exceptionally low, 70 cents a day?? Has been pretty cold up there. Sure heater is on low?

A lot may depend on how many readings have been estimated.
I agree that an occupied cabin will use more than $20/mo.
An 800-1200w electric heater averaging 1,000 watts is going to use 24KW a day, 720 a month.
Then there's water in general - My water pump uses a lot of wattage and the hot water heater a lot too.
Electric cooking... microwave....
Is it possible that you had left the place empty past years? Maybe all those $20 months were estimated?
I'd be prepared for this being accurate.
I live alone in CT in a small part of my house, with propane heat, but still spend about 115/mo in winter.