I know what a watt is, and I understand what giga means. I know what a calorie means because I eat food and I have to make decisions about how many calories to consume daily. I know what horsepower means because when I shop for cars, I compare them to one another. I don't know what gigawatt means because I don't shop for power, I don't compare power output of one reactor to another, and I don't worry about power consumption because it's all covered by my wall outlets.

I don't know why you're getting uppity about this specific unit, but your post reeks of elitism and arrogance. You happen to understand what a watt is, so it's disheartening and sad that nobody else does (it's so lonely being so smart and being surrounded by dumb people)? Keep your shitty judgmental attitude to yourself.