Hi, I'm Snage. I'll take you through Energy Systems and Power Grids.

First lesson: "Sources, Carriers, Services", the path from coal or wind to a warm room.

A heat pump gives 3 kWh of heat for 1 kWh of electricity. Where does the rest come from?

Why can't a wind farm just turn itself up when demand rises?

And why do airliners still burn liquid fuel instead of flying on batteries?