Design of a sustainable polygeneration microgrid for the retrofitting of an industrial site: Ansaldo Energia case studyEnrico Bianchi, Stefano Bracco, Fabio Cannizzaro, Federico Delfino and Alessandro GiacchinoE3S Web Conf., 113 (2019) 03009DOI: https://doi.org/10.1051/e3sconf/201911303009