ELON MUSK IS the closest thing this world has to a real-life Tony Stark. He builds cool cars and rockets and tunneling machines. He wants to fire people through pneumatic tubes. He built a ginormous battery factory in the desert, and now he’s building the world’s largest battery.
OK, technically, Tesla is – but same difference, because Tesla is his company. And Tesla plans to build a lithium-ion battery array capable of storing 129 megawatt-hours of energy. What is a megawatt hour, and just what could you do with all that energy?
The most common unit for energy is the joule. If you pick a textbook up off the floor and place it on a table, you’ve expended about 10 joules of energy. The precise figure would depend upon the mass of the book and the height you raised it.