Question from a friend - Solar and Snow

Do Solar Electric systems work in the winter? According to the Ottawa Solar website: "Yes solar panels produce power in the winter. If the sun is shining and the panel is not covered in snow, it will make energy. We live in Canada, so there will be times with snow on the panels. We’ve seen snow stick to panels that are at a 50 degree incline. We’ve also seen snow slide off a panel at a 30 degree tilt. So get used to it, we’ve been getting snow for hundreds of years, and will continue to get it for many more to come."