Electricity rates in Ontario are set by the Ontario Energy Board (OEB). Rates are calculated using a 12-month forecast that helps make pricing more stable, predictable and fair both for users and for generators.
With Time-of-Use (TOU) pricing, the price of electricity depends on when you use it. There are three different prices for electricity: On-Peak, Mid-Peak and Off-Peak.
Winter Time-of-Use Prices and Hours (effective November 1, 2018)
Note that there was no change to rates, only price periods.