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This work presents an economic analysis of water pumping by small photovoltaic and gasoline systems for irrigation in the semi-arid region of northeastern Brazil, were electrification achives only 15% of rural houses. Farms are characterized by small areas where rain water availability is quite small. as well. For such needs, the Diesel commercial pumping systems are usually too large and expensive. Results show that water supply by photovoltaic is less expensive than gasoline when international PV module prices are considered and more expensive for domestic prices.