I have recently come across a recommendation to shift production load of a big injection moulding machine to reduce demand during forecasted provincial peaks. If machine is loaded during day and not loaded during night and electricity is cheaper during night, then it seems like a no-brainer.
I am not convinced in validity of such approach. Energy cost savings are there, no doubt.
However, plant will have to ensure that supervision and maintenance are present during night shift too. These are extra costs, which must be evaluated against energy cost savings.