We have one of those smart meters and it sends you updates on your usage....it's pretty neat. Based upon last weeks usage, after we put the curtains up, we're saving $.34 a day in electricity. Seeing as I spent about $120 on the curtains (I think. I didn't check my previous post), the curtains will have paid for themselves in 352 days. Not bad....and they might pay for themselves quicker when it starts to get hotter outside. Win!