Regulators meeting Friday could allow Mississippi Power Co. to collect an additional $58.6 million in the last six months of 2012.
That would start paying for the $2.76 billion power plant the company is building in Kemper County.
Filings with the Public Service Commission show that the average residential customer's bill could go up $15 to $20 a month, if a majority of three commissioners approve.
It's unclear whether commissioners will vote Friday or later.
The increase would be crammed into six months, pushing average bills for all users 15.7 percent higher in that period.
PSC staff members have proposed that commissioners cut the overall rate increase by $3.3 million, to $55.3 million.
The company has already spent $1.4 billion on Kemper, about half of which is borrowed.