Demand for electricity in Ontario fell last year to levels rarely seen in decades because of COVID-19-related measures.
Data from the Independent Electricity System Operator show the decline occurred despite higher demand from people at home.
Residential peak demand has climbed 13 per cent above pre-pandemic levels over the winter; and 19 per cent in the summer.
In all, Ontario used 132.2 terawatts of power in 2020, a decline of 2.9 per cent from 2019.
Summer saw the highest levels since 2013.
Overall the demand last year was the second lowest since 1988.