Abstract
The main aim of this current study is to empirically scrutinize the determinants of energy consumption for 24 African countries sub-grouped into three panels based on income levels: low-, lower-middle-, and upper-middle-income countries, from 1990 to 2015. Due to the presence of heterogeneity and cross-sectional reliance among country groups, recently developed econometric approaches, which include cross-sectional Im, Pesaran, and Shin together with cross-sectional Augmented Dickey-Fuller stationarity tests, Pedroni and Westerlund–Edgerton cointegration assessment, dynamic common correlated effect estimation approach and Dumitrescu–Hurlin Granger causality test are employed. Empirically, our findings depict analyzed variables are stationary and characterized by long-term stability affiliations for all panels. Economic growth, urbanization, population growth, and oil price with labor and capital stock as intermittent variables had palpable significant positive sway on energy consumption for all panels though their respective weight of contribution differed from one country group to another. The granger test of causation unveiled that (i) among all panels, urbanization and energy consumption are connected bidirectionally, whereas population growth causes energy consumption; (ii) a one-way causal link from economic growth to energy use is evidenced in low-income African countries, whereas a two-sided connection is confirmed in both lower-middle- and upper-middle-income economies; (iii) a bilateral causal association in low-income African nations is observed amid oil price and energy use, while a uni-lateral relationship extends from oil price to energy consumption in both lower-middle- and upper-middle-income nations in Africa. Such new methodologies and findings reveal that the long-term estimated effects as well as causal affiliations amid variables are skewed by different income levels of African countries in an attempt to conserve energy. Policy recommendations are further propose.
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Notes
Emphatically, country’s income level has been found to affect its consumption of energy. This so because, from the demand perspective, countries with higher income levels can afford more energy consuming equipments and machineries compared with those with low levels of income. Similarly, from the supply angle, firms in countries with high-income levels keep demand for goods and services of the market relatively low. On the other hand, individuals and businesses in countries with high income can easily invest in energy efficient equipment and machineries to reduce the consumption of energy. In countries with lower income levels, although individuals demand for energy consuming equipment and companies supply of goods might be relatively low, the use of old equipment and machineries could increase energy consumption. These aforestated assertions therefore insinuate that country’s income level is highly linked to its rate of energy use in the process of moving from one level to the other. This thus justifies the employment of income levels classifications as sub-groups in our study.
The lagged dependent variable is regarded as not strictly exogenous when estimating the DHPD model; thus, to make the DCCE estimator more efficient cross-sectional averages are added to the model with respect to the explanatory variables.
Due to the large nature of the values pertaining the value of GDP, URB, POPg, and OP as variable of interest, we expressed all in millions with the exception of EC
Detail results of the D-H Granger causality test for all the country groups are provided in the Appendix.
Abbreviations
- CADF:
-
cross-sectional augmented Dickey–Fuller test
- CIPS:
-
cross-sectional Im Pesaran and Shin
- DCCE:
-
dynamic common correlated effect estimator
- DHPD:
-
dynamic heterogeneous panel data model
- POPg:
-
population growth
- GDP:
-
gross domestic product
- URB:
-
urbanization
- L:
-
labor force
- K:
-
capital stock
- OP:
-
oil price
- CD:
-
cross-sectional dependence
- CDLM :
-
cross-sectional dependence Lagrange multiplier
- CDLMadj :
-
Cross-sectional dependence Lagrange multiplier adjusted
- P-Y:
-
Pesaran–Yamagata homogeneity test
- W-E:
-
Westerlund–Edgerton bootstrap cointegration test
- D-H :
-
Dumitrescu and Hurlin
- PCA:
-
principal component analysis
- KMO test :
-
Kaiser–Meyer–Oklin test
- B-S test :
-
Bartlett sphericity test
- OPEC:
-
Organization of Petroleum Exporting Countries
- WDI:
-
World Bank Development Indicators
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Funding
This research fund was supported by the National Science Foundation of China (Nos. 71774070, 71804060) and Jiangsu Province Graduate Scientific Research Innovation Project (China) (KYCX17_KYZZ16_0336).
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Adjei Mensah, I., Sun, M., Gao, C. et al. Investigation on key contributors of energy consumption in dynamic heterogeneous panel data (DHPD) model for African countries: fresh evidence from dynamic common correlated effect (DCCE) approach. Environ Sci Pollut Res 27, 38674–38694 (2020). https://doi.org/10.1007/s11356-020-09880-0
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DOI: https://doi.org/10.1007/s11356-020-09880-0