Batteries used for the grid are reliable and with very little environmental concerns. You can use water batteries or other various gravity batteries. Very effic

Batteries used for the grid are reliable and with very little environmental concerns. You can use water batteries or other various gravity batteries. Very efficient, these lose practically no energy over a long period of time. The problem is small (ish) batteries. Like those in cars. Which is why it's very, very important to start phasing out large scale automobile transportation. We've had electric trains for decades and not only are they orders of magnitude more efficient per passenger, they also don't require batteries.