New electric aggregation contracts with Dynegy Energy Services may mean lower bills for Mansfield and Ontario residents. According to RichlandSource.com, the city of Mansfield entered a contract for a fixed rate of 4.915 cents per kilowatt hour for 34 months in early July, around the time the city of Ontario entered their three-year contract for a rate of 4.99 cents per kilowatt hour. Officials in both cities anticipate great savings for residents in return for the challenges they faced in finding rates under five cents per kilowatt hour.