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Thermal efficiency (%) in power supply: This supply-side energy efficiency indicator measure the efficiency of thermal plants in converting primary energy sources—such as coal, gas, and oil—into electricity. They are calculated by dividing gross electricity production from electricity and cogeneration plants by total inputs of fuels into those plants. Whether market-based or privately owned, self-generating plants that do not export their power are included in the index assessment. In the case of cogeneration plants, fuel inputs are allocated between electricity and heat production in proportion to their shares of the annual output.