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This paper analyses the economic aspects of the Ebro water transfer, which have been overlooked in the Spanish National Hydrological Plan. The questions exam ined are the cost of transferred water, and irrigated agriculture in the Levante and south-eastern regions, which are the main water transfer destinations. Results show that the water transfer is not economically sustainable, because the costs of the diverted water are higher than the current marginal value of water in agriculture, and crop profitability is insufficient to pay for the whole volume of transferred water. A compromise solution between increasing water supply and demand management measures will combine a reasonable water price increase with water desalination in coastal counties. This solution would reduce water demand with a moderate effect on farmers' revenue and net income. Spain could find alternative investment projects to the water transfer, able to improve social welfare. [ABSTRACT FROM AUTHOR]