The index assesses the efforts of 125 countries, given their ability to provide a stable energy system in three ways: "energy security" (data on the effective organization of primary energy supplies from national and foreign sources, the reliability of energy infrastructure and the ability of energy suppliers to meet current and future demand), "accessibility" energy (universal availability and financial accessibility), "environmental sustainability" (measuring overall efficiency in achieving a sustainable combination of polycy and balance, it highlights how well countries manage trade-offs).
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