Power use in Ontario
@Martin: There is no need for storage, the power generated would be fed directly to the grid. Ontario is at a significant deficit for power generation and this plant would simply be adding to the grid for immediate use and to avoid implementation of any other method of power generation, i.e. coal, hydro, or nuclear.
Also, I am pretty sure that Ontario's power requirements are far higher in the summer than winter, believe it or not Ontario's temperatures can swing from +40C to -40C between summer and winter and this is the part that I am not 100% certain of, but I believe most Ontarian's use gas and /or oil for heating in the winter, but use electricity for air conditioning in the summer. You have to remember, not all of us Canadians live in igloos in the Arctic. Sarnia, where this facility is going to be located is actually south of more than 10 entire US states, France and half of Italy!
The area around Sarnia is extremely flat and is predominantly farm area, so it is ideal for solar panels. As someone mentioned, depending on how they are installed, livestock could still utilize the space.
As for "green manufacturing", it's the massive throw away manufacturing that should be investigated, plastic bags lining cardboard boxes for cereal, cardboard boxes in plastic shrink wrap at Costco for evry item including razor blades, and postage stamps and other over packaging that is the problem, not the manufacture of items that will a) Produce green power and 2) Last for decades.
The manufacturing facility probably already exists, so it is justifying an already expended energy to build the facility. That's about as green as you can get without making everything by hand from palm fronds.