Hi. I live in the mountains of Colorado. On the outskirts of Idaho Springs, CO, there is a large subdivision called York Gulch. Although utilities are available in the area, long ago, the residents decided to live off the grid.
York Gulch has hundreds of homes running on a variety of alternative power sources such as solar, wind, propane and AC. The subdivsion has sucessfully been off the grid for 40 years. However, from a social standpoint, I can tell you that the locals' nickname for the area is "Divorce Gulch" due to some of the normal frustrations of "living off the land".
There are many additional off the grid areas in the State of Colorado such as parts of the Arkansas Valley. Because Colorado is so rural, many home owners live off the grid simply because it is cost prohibitive to run power to their property.