> disconnecting from the grid is not permitted In the context of the OP, which is a federal agency, whether or not you can build a house that is disconnected f

> disconnecting from the grid is not permitted In the context of the OP, which is a federal agency, whether or not you can build a house that is disconnected from the electrical grid is determined first by your local laws, and secondly by your state laws. You can certainly build houses in the US that aren't on the electrical grid, demonstrating that there's no federal prohibition against it.