"[Question] 3: How Much Power Are We Talking About? . . . [A] watt is a bit of energy per second [like] measuring the flow of water out of your kitchen faucet . . . . Watts are equivalent to "cups per second." A watt is pretty small. A small incandescent bulb might use 40 of them. A hair dryer uses 1,500. A power plant might generate hundreds of millions of watts. . . . Because these numbers get big fast, it's convenient to use some shorthand. A kilowatt is 1,000 watts, a megawatt is a million, and a gigawatt . . . is a billion."