When it's really freaking cold, is green power a solution?

An emergency alert on Alberta's power grid has people asking: can renewable energy get us through Canada's extreme winters? We find out what really triggered Alberta's electricity supply crunch, and how a greener grid can still meet demand. We look to Northern B.C. and Norway to see how electric vehicles handle frigid temperatures. Plus, how heat pumps can still keep you toasty in Canada's coldest cities and what you should consider before getting one.