Globe and Mail: Ontario is about to rival Prince Edward Island as the province with the highest electricity prices in Canada, and rates will, for the first time, exceed the average cost of keeping the lights on in the United States Residential customers in Ontario will pay $300 more a year on average for electricity by the end of 2011, an increase of 25 per cent, according to energy consultants. And the rate increases won’t end there. Investments of more than $8-billion in green energy projects …