Assessment of the efficiency of innovation projects in the energy sector Natalia Ershova, Ruslan Shangaraev, Mikhail Kostyshak, Natalia Safonova, Valentina Sukhova, Elena Popkova and Elena Tinkova E3S Web Conf., 110 (2019) 02132 Published online: 09 August 2019 DOI: 10.1051/e3sconf/201911002132