Unfortunately, while it certainly helps, there's nowhere near enough geothermal energy in the world to make up the difference, even if used at unsustainable rates.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].
The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.