Over-Drilling: Local Externalities and the Social Cost of Electricity Subsidies for Groundwater Pumping

Jesus Bueren, Xavier Gine, Hanan Jacoby and Pedro Mira

No 10508, Policy Research Working Paper Series from The World Bank

Abstract: Borewells for groundwater extraction have proliferated across South Asia, encouraged by subsidized electricity for pumping. Because borewells operating near one another experience mutually attenuated discharges and higher failure rates, farmers deciding whether and when to drill interact strategically with potentially many neighbors through the spatial network of agricultural plots. To incorporate such interactions in policy counterfactuals, this paper estimates a dynamic discrete network game of well-drilling using plot-level panel data from two states of southern India. The current regime of free (but rationed) electricity is then compared against an annual tax on all functioning borewells that fully defrays electricity costs. The cost-recovery tax, by reining in over-drilling, eliminates a deadweight loss of 170 USD per acre of land with groundwater potential, 30% of the fiscal cost of the subsidy. Further, taxing borewells at a rate 18% higher than annual electricity costs (to address the negative externalities) is socially optimal. The model estimates also suggest a practical compensation scheme to build farmer support for electricity price reform.

Date: 2023-06-27
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