Does it have to be perfect? Even partial coverage would at least reduce demand from the grid and lower electricity bills for all. Winnipeg could be covering rooftops with panels wherever possible (and tenants could be hanging them from apartment balconies & windows like they recently approved in New York). Right now it's just farms and other businesses doing it, which they probably wouldn't be if it weren't for the fact solar starts paying for itself immediately upon use. I suppose these places have just worked something out on their own for when snow starts accumulating and/or are resigned to more of the benefits coming from longer summer days than in the winter. (I wonder if there's a possible market for accessories like heated "windshields" that can make snow clearing easier and less likely to invite damage.)