Same here - 19.5%. Alabama Power Company.
Used 80 kWh less and bill up $155 for Dec/Jan bill.
I have Alabama Power too. If you don't mind my asking, how do you calculate your true kWh rate?
I calculate mine like: kWh rate = [Total Bill in Dollars - Total Flat Rate (with taxes)] ÷ kWh pulled that month
So for me this month that's:
kWh rate = [$189.67 - $15.60] ÷ 1140kWh
kWh rate = $174.07 ÷ 1140kWh
kWh rate = 15.2692¢/kWh
In the January bill a year ago I calculated it as 12.7775¢/kWh (keep in mind back then the flat monthly fees was $15.86, not $15.60, because beginning with the July 2022 bill the reduced the natural disaster rider from 75¢ to 50¢ and I believe that part is also taxed at 4%).