approx. $200-250 depending on the season (air conditioning vs. heating) but I do not live in Toronto.
I imagine it would cost more in a metro area.
dj1470 has the best average costs, provided the home has nataural gas. $200 a month is a good ball park for urban/suburban homes 1950-1980 vintage. Newer homes tend to vary much more due to occupancy... lower heatng and ac demand but much higher electrical demand, every kid has computer, TV, game boxes etc none of which never get switched off.
In fact rural areas cost much more due to electric, oil or propane heating... ouch.
Most of the condo fees for townhouses are unrelated to utility costs, since you typically only pay common water and sewer fees, and the community lighting fees... Most townhouse condos you pay your own heating & water heating and electricty...
Freehold condos in my experience are generally lower quality in comparison.
Your best bet is to buy a new home which are much more efficient, and then control your own electrical costs by using energy efficient appliances and lighting, and avoiding using electricity at peak times, since new time of use fess are being imposed everywhere in Ontario...
Most utility companies let you review your usage and billing to plan load shifting... laundry and dishwashing off peak etc... also dont forget to purchase and USE a set back thermostat