There is the same amount of sun shine with or without a time shift.The theory is that the more the sun shines outside the more people will be outside and not in their air conditioned homes. Only problem is when it's 105 outside and no clouds people are inside cranking the a/c unit down to 68-70. Or, if outside, the a/c is still cranked down so the house will be cool when they go inside. There should be more sunshine in the winter not less.