live off the grid
1. To live without one's home connected to municipal utility systems, such as the water supply or the main electrical grid. I just need to get enough solar panels installed to disconnect from the city's electricity supply and I'll be able to live completely off the grid.
2. To exist outside of governmental observation; to be untraceable through any means of commerce or communication that could be linked to one's identity. Fearing for his life, the whistle-blower from the intelligence agency was forced to live off the grid for a number of years, eschewing anything that might leave a digital footprint for someone to find.