In fact, it gives off energy and that free energy that is given off when the purple molecules move down, their electrochemical gradient is captured and is used to basically move these other molecules. So we have these orange molecules against their electrochemical gradient. So we move them from the inside to the outside. So we see that an antiporter or antiporters use the electrochemical gradient of one molecule to move a second type of molecule in the opposite direction against its electrochemical gradient. And we call them anti Porters because they move in opposite direction. So this one, the purple one, moves in this direction, the orange one moves in the opposite direction.