Saving $20 a quarter may not seem like a whole lot but try going into any shop to buy anything and be $20 short and you wont get it. Many of us don't have solar or good sunshine. The attached photo is what I see out of my kitchen window it's not my hedge so I'm not allowed to cut it I have to have a light on in the kitchen for most of the year. Quick calculation says that if 125 million homes drops $20 a quarter thats a billion, considerable amount of money AND a considerable amount of fuel wasted to generate a billions worth of electricity. Of course there are many multiples of that wasted it's using up valuable resources and making a small amount of rich people richer. Ireland still uses peat and coal to generate electricity thereby ruining bogland and making a contribution to global warming. We have wind farms here, they are subsidized by a green levy on electricity bills of 13.5% most of what they generate is sent to the UK via an interconnector so they can reduce their emissions.
My missus, she that turns off appliances, always fills the kettle and boils 2L of water to make one cup of tea.