This is where having a solar system, Powerwalls and ToU rates can help. Over 98.5% of our grid usage is during our utility's off-peak period. We have our Powerwalls and solar scheduled to power the house over 22 hours a day. We could probably live off the grid about 9 months of the year but by being connected, we're able to send our surplus solar back to the grid and take advantage of it during Storm Watch periods. Our utility (not FPL) allows us to roll over credits indefinitely so we earn huge peak and part-peak credits in the spring/summer/fall which will carry over and cover our electric bills in the winter or other stormy months when we might not have a surplus. Since we only use off-peak grid usage ($0.08/kWh), it makes those credits earned at $0.13/kWh or $0.20/kWh last that much longer. Sure, it wasn't cheap to install but prices have dropped 40% since we put in solar and we live knowing we could live off the grid indefinitely.