Because of the seasonal, daily, and even hourly changes in the weather, energy flow from the
wind and sun is neither constant nor reliable. Peak production times do not always coincide with
high power demand times. To depend on the variable wind and sun as main power sources
would not be acceptable to most American lifestyles. Imagine having to wait for the wind to
blow to cook a meal or for the sun to come out from behind a cloud to watch television!