Maybe they are just giving back the energy to the grid in two respects, (1) energy they contracted for today they do not consume but sell back to the grid and (

Maybe they are just giving back the energy to the grid in two respects, (1) energy they contracted for today they do not consume but sell back to the grid and (2) the energy was to come via the grid to them but, in not consuming that energy, the energy flows to homes, etc. instead and, thus, at least is redirected in the grud or, if you will, flows from the aluminum plant to the homes. At one point, they do say virtual. The losses involved are from some somewhat inefficient use of the grid and, there, losses flowing the energy through the grid.