Abstract
Total primary energy requirement (TPER) divided by gross domestic product (GDP) is a commonly used indicator that measures national energy efficiency. However, this indicator is too approximate to represent actual efficiency and is misleading. This paper tries to estimate a ‘real and single’ indicator that can be used for international comparison of energy intensity directly. A case study between the US and Japan indicates that the US consumes only 23% more energy than Japan, while a comparison using TPER/GDP shows that the US consumes 72% more.
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