Among them is Susan Hosford of Denison, Texas. On a typical February day, she pays Griddy less than $2.50 for power. But the one-day cost spiked to hundreds of dollars after the storm. In all, she was automatically charged $1,346.17 for the first two weeks of February, which was more than she had in her checking account, causing her bank to charge her overdraft fees and affect other bills.