You are going to either get ripped off or nowhere by trying to find one online.
Open the yellow pages and look for payday lenders in your town. Believe, me, there is ONE I can guarantee it.
You need a paycheck stub, current utility bill with your address on it, checkbook, ID and possibly ss card.
Online payday lending is probably illegal where you live. That is why you need to find one that you can go into in person.
Other than that, have you called the power company and tried to make payment arrangements? A lot of times, they will give you an extra week to come up with the amount due.