The development of renewable energy and state policy in improving energy efficiency Shakizada Niyazbekova, Saltanat Yerzhanova, Yuliya Tyurina, Mirlan Abilmazhinov, Кarl Кyazimov and Evgeniya Smernitskaya E3S Web Conf., 244 (2021) 10059 Published online: 19 March 2021 DOI: 10.1051/e3sconf/202124410059