Certainly here in North America, particularly in the northern climates, you'll see that November, December, and January are really the off-peak months. We can have up to a month. As you saw in November, there was very little sunshine available. But then again a lot of the energy peak demands that happen are during sunny periods or warmer periods, regardless, so it does work quite well towards not only the peak time during the day but also towards seasonal peak demands, particularly for air conditioning.
On April 18th, 2007. See this statement in context.