L.D.
We have used Green Mountain Energy for 4 years and have had no problems. They're 100% green energy and the same price as the major provider (TXU/Oncor). As with any smaller provider, you have to call Oncor, not Green Mountain, if you have problems with the actual electricity - line down, service out, etc., but it's no big deal. Since we're deregulated in Texas, this is common. Some other companies advertise green options, but the companies still produce dirty power and aren't cheaper, so why not go for all "green"? Green Mountain has on-line billing and I've found their customer service to be very helpful and friendly. Good luck with the move!