The average Arizona home uses 1,129 kWh of electricity a month or 13,548 kWh a year.
kWh is an abbreviation for kilowatt hour. How do I express kilowatt hours? Maybe kWh(s)? It would look strange as kWhs.
The average retail price for residential electricity in Arizona is 11.90 cents per kWh.
Do I need the "per" kWh? Is the word per already assumed?