25% is actually pretty lousy conversion efficiency for any self-respecting power plant (not that I know typical values for nuclear plants). I noticed the error also, but was more inclined that the error was made going the other way – somebody read 33% efficiency somewhere, and made the common slip of converting that to “1 out of 3” in their head, and simply made the incorrect statement that meant 3x more was thrown away than produced. In other words, they should have said “reject 2 times as many megawatts …. 33%”.
