Predicting peaks in supply and demand for energy is essentially turning the utility into a hedge fund. I think it's worth considering the overall characteristics of the "improved" algorithm, since the ML optimizations are likely analogous to leveraging based on an overfitted predictive model, and the objective of a power grid is resilience as well as efficiency. Also, depending on how you define efficiency, it may be…
Dispatch priority already ensures that if wind is available it will be used in preference to coal: https://www.economy-ni.gov.uk/consultations/priority-dispatc...