“…In the literature, as in many other fields, there are studies carried out using the DEA method in the energy sector (Khoshroo et al, 2013;Arabi et al, 2016;Guo et al, 2017;Jebali et al, 2017;Yang and Wei, 2019;Djordjevic and Krmac, 2019;Yu and He, 2020;Xu et al, 2020;Wang et al, 2021;Zhang and Chen, 2022;Talep, 2023;Yuan et al, 2023;Shah et al, 2023;Yu and Tang, 2023;Karasek et al, 2023). In this context, it is aimed to measure the efficiency of fifteen companies operating in the energy sector in Turkey with the Data Envelopment Analysis (DEA) method.…”