“…However, the issue of index construction has been widely researched in different topics, such as sustainable economic welfare [20], responsible investment [21], sustainability measurement [22], quality of life [23], assessment of air quality [24], and energy sustainability of rural communities [25]. Also, renewable energy was a key sector for designing indexes identified in literature as FFSI [26], AESPI [27], RECAI [28], EPI [29], RERII [21], SSEI [30], and GSI [31]. In the context of the above, we consider it appropriate to create an index that measures the sustainability of renewable energy in each country.…”