Soo... 12 TWh? Isn't that why we have metric prefixes? So we don't have to say that there's 12 billion of something...

Outside of tech circles, it's pretty normal to avoid using the uncommon prefixes. Nobody says the Earth has a 40 megameter circumference...

Billion can mean different things in different parts of the world. kilo-, mega-, giga-, tera- are the standard prefixes.

120 trillion dWh is how I like to think about this. Very impressive.