Others have replied saying why this may not be the case, but even if it is — you also need to balance efficiency with other values, such as independence and res

Others have replied saying why this may not be the case, but even if it is — you also need to balance efficiency with other values, such as independence and resiliency. I would gladly trade a bit of efficiency to not be dependent on the grid or on providers who can jack up the price on a whim outside of my control.