The World Energy Council (WEC) publishes the Energy Trilemma Index annually to assess the performance of energy systems across countries. The so-called "three-dimensional" refers to:
1) Energy Security: Effectively manage domestic energy production and energy imports, together with a reliable energy infrastructure to meet current and future energy needs.
2) Energy Equity: The general public can access energy supplies easily and cheaply.
3) Environmental Sustainability: Energy efficiency at the supply and demand sides, developing renewable and other low-carbon energy sources.