2017年-世界发展银行全球_Heterogeneous_Effects_of_Rural_Electrification___Evidence_from_Bangladesh_38页_848kb

Heterogeneous Effects of Rural Electrification: Evidence from Bangladesh

Core Content

This paper investigates the heterogeneous effects of rural electrification in Bangladesh, focusing on how the reliability of electricity supply and the duration of grid connection influence development outcomes. The study uses a panel dataset of 7,018 rural households from 2005 and 2010 to assess the economic and social impacts of electrification.

The paper argues that the benefits of electrification are not uniform and depend heavily on the quality of electricity and the length of time households are connected to the grid. It also highlights the distributional impacts, noting that electrification disproportionately benefits women and girls.

Main Points

1. Context-Dependent Benefits

• The magnitude and type of benefits from electrification are highly context-dependent.
• Poor electricity reliability significantly reduces the effectiveness of electrification.
• Power outages have a strong negative impact on development outcomes such as income, study time, and labor participation.
• Long-term benefits emerge as households become more accustomed to electricity use, including increased income and empowerment.

2. Duration of Grid Connection

• Basic benefits like improved lighting are immediate, while longer-term benefits such as increased income and study hours take time to materialize.
• Labor force participation and income growth are observed only after more than 11 years of grid connection.
• Kerosene consumption decreases with longer exposure to electricity, indicating a shift from traditional energy sources to electric appliances.

3. Distributional Impacts

• Electrification has a greater impact on higher-income households compared to lower-income ones.
• Women and girls benefit more from electrification, with girls' study time increasing by 0.47 hours per day and women's labor force participation rising by 2.3 percentage points per year.
• Poor households may benefit from spillover effects, such as access to shared appliances and services.

4. Empirical Strategy

• The paper uses a two-stage propensity-score-weighted fixed-effects model and an instrumental variable (IV) approach to address potential endogeneity.
• The instrument is based on distance to the nearest electric pole, with households within 100 feet of a pole being more likely to adopt grid electricity.
• A square term of the duration of electricity connection is included in the model to account for diminishing returns over time.

Key Findings

• The overall gain from expanding electricity access and improving reliability in Bangladesh is estimated at US$2.3 billion per year.
• Power outages have a strong negative impact on development outcomes, with households facing over 21 hours of outages showing no significant difference from non-electrified households.
• Kerosene consumption is reduced by 7.8% per additional year of grid connection, and annual income increases by 1%.
• Girls' study time increases by 0.47 hours per day after electrification, while men's labor participation shows no significant change.
• Women's empowerment improves with electrification, particularly in 2010, where the effects became statistically significant.

Policy Implications

• Universal access to electricity is important for improving rural wellbeing, but reliability is equally crucial.
• Short-term electrification may not yield substantial economic growth, especially in areas with unreliable supply.
• To achieve inclusive and long-term benefits, governments should focus on improving grid reliability and promoting productive use of electricity, particularly among poor households.
• Contextual factors such as initial household conditions and geographic proximity play a key role in determining the magnitude of electrification benefits.

Data and Methodology

• The data comes from two rounds of household surveys conducted in 2005 and 2010, covering 45 rural electric cooperatives.
• The sample includes 7,018 households, with household-level and village-level characteristics collected.
• Propensity score-weighted fixed effects and IV estimation are used to control for endogeneity and unobserved heterogeneity.
• The instrumental variable is based on distance to the nearest electric pole, which is associated with lower connection costs and higher likelihood of electrification.

Conclusion

The study concludes that while rural electrification in Bangladesh has brought substantial benefits, these benefits are context-dependent and heterogeneous. Improving reliability and long-term exposure are critical for maximizing the positive impacts of electrification. The paper also highlights the importance of considering distributional effects when designing electrification policies, as women and girls benefit more than men and boys.