Paper mills and other wood processing make for great instantaneous interruptible load. In NZ one of the major electricity generating companies pays some major

Paper mills and other wood processing make for great instantaneous interruptible load. In NZ one of the major electricity generating companies pays some major industrial customers for the ability to cut them off, enabling them to reallocate the power almost as if it were additional generation. Aluminium smelters are good too, but you can't cut them off without warning, because it will break the arc-furnaces when the aluminium solidifies around the carbon electrodes.