I have been using them for at least 6 years. I was with TXU and my electric bills were never below $250 during the year, with summer bills going up above $400. Once I switched to Group Rate Electricity, my bills are always in the LOW $100’s. Our home is about 2,000 square feet and was built in 1986. Being retired now, that savings makes all the difference in the world in our budget. Great Customer Support. I have referred them to all my friends.