Energy efficiency into industrial facility

How is possible to increase efficiency into industrial facility? Do new energy generation systems (hardware) are necessary? Do machine learning and artificial intelligence could improve performance?

During my Ph.D. I analysed both efficiency energy conversion system based on SOFC/RSOC to produce energy both to improce polygeneration system using data analytics and machine learning. Clustering is proposed to define polygeneration system and to perform short-therm forecasting combined with kNN.