Ok here is the one idea I came up with on my drive into work this AM:

"No Lights - Family Nights"

The public service announcement shows a man strolling along on a beautiful starry night and you see in all the windows pictures of families sitting together doing things by candle / lantern light - one family is gathered around a piano singing songs togehter, the next family is playing charades in front of a fireplace with a roaring fire, the next family is at their dining room table playing cards or some other game, etc. There is no narration during this part.

Then, the end of the commercial there is a tag line about how "No Lights - Family Nights" are good for the environment and great for family togetherness.