When it says transaction, is it referring to one person sending bitcoins to another person, or something else? Is that much energy really required confirm just one transaction?
I'm also wondering whether the energy requirement depends on the amount of bitcoins being sent as well.
I suspect she is talking a load of spherical objects, and doesn't understand Bitcoin. It's probably the amount ofpower required to generate a block. Also, it may include the power used in maintaining the Bitcoin nodes - I've got a node running whilst I post this, so what percentage can be attributed to the node?
I bet more energy is used by Twitter and its followers, and then there is YouTube, and the rubbish that is downloaded there.