SACRAMENTO, Calif. — The Sacramento Municipal Utility District [SMUD] is warning its customers to expect an increase in their utility bills this summer. 

As the electric company moves into the summer season, customers may see more expensive power bills if they use electricity during peak, mid-peak, or off-peak hours.

SMUD's "Time-Of-Day" rates change depending on the time of the year. SMUD recognizes two seasons: summer season, which falls between June 1 and Sept. 30; and the non-summer season, which falls between October 1 and May 31. During the summer season, the Time-Of-Day rates are more expensive as the 24-hour period of a day is broken into three categories: peak, mid-peak and off-peak. 

Off-Peak 

$0.1166 kWh (kilowatts per hour)
(Midnight - Noon / Monday - Friday)

During these hours, electricity is at its cheapest. While peak and mid-peak hours only occur on weekdays, these off-peak hours occur every day, including weekends and holidays.

Mid-Peak

$0.1611 kWh (kilowatts per hour)
(Noon - 5 p.m. and again from 8 p.m. - Midnight / Monday - Friday)

During these hours, electricity is slightly more expensive. Mid-peak hours occur before and after peak hours Monday through Friday. 

Peak 

$0.2835 kWh (kilowatts per hour)
(5 p.m. - 8 p.m. / Monday - Friday)

During these hours, electricity is the most expensive. Usage rates are more than double that of the off-peak hours. Peak hours occur Monday through Friday.

WATCH MORE: How to Avoid Paying More with SMUD's Time-of-Day Rates

SMUD rolled out new time-of-day rates to customers in the Sacramento area. Here's how they work and the times you will pay the most to use electricity. Also, some tips on how to cool your house and not pay the highest rate.