I wrote:
> It resembles airplane seats available between midnight and 8 a.m. They are > discounted because few people want to fly "red eye" at those hours . . . > Note that airlines have to fly some number of airplanes at night, to position them for service the next day. They cannot terminate all nighttime flights. (That was the situation years ago, anyway.) Since they have to fly, they might as well sell the seats at a big discount. They resemble Texas power companies that cannot turn off their nukes and wind turbines, so they might as well sell the power at a deep discount, or give it away. They are not actually giving it away; they are selling it for a flat fee, the way an ISP sells you bandwidth, or NetFlix sells you movies. There is no incremental extra cost for nighttime power, but it is not free.
