Multilevel decomposition analysis of energy intensity in the Thai road transport sector

Abstract

This article presents the changes of aggregate energy intensity in the road transport sector in Thailand. Seven vehicle types in the Greater Bangkok (GBKK) and the provincial areas are considered during 1990-2007. Vehicle types consist of sedans, vans and pickups, motorcycles, taxis, buses, trucks, and others. The logarithmic mean Divisia multilevel decomposition method is employed to investigate the changes in aggregate energy intensity through structural effect, energy intensity effect, and fuel share effect. Results show that the aggregate energy intensity decreased by 39.6% in 2007 due to decreasing in energy intensity and structural effects. In the area level, the aggregate energy intensity decreased in the provincial area by 30.3% and in the GBKK area by 13.4%. The energy intensity effect decreased in all vehicle types, except in taxis, while the structural effect decreased in all vehicle types, except in sedans. Results could be used to formulate strategic plans of energy-efficiency measures in the transport sector. KEYWORDS Decomposition; energy intensity; logarithmic mean Divisia index; road transport; structural and fuel share effects

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