According to my power calculator, which came via a cycling forum where it was considered to be reasonably accurate, for a 78kg rider on a 33% incline...
Given my experience this afternoon, i'd say that a powerful ebike (such as this) would probably take you up a lakeland pass at 15mph in turbo mode......
He would have won stage 1 as well if a rider in front hadn't had to unclip, having over cooked the last bend, and causing everyone behind him to ease...