The World Bank is changing the way it does business in the energy sector. This Policy Paper is one of two that outlines the Bank's new policies for the sector. The review was prompted by concern about the effects of power generation on the environment and on populations that may be resettled to make way for projects. Another stimulus was the macroeceonomic reality of fewer investment resources in many countries. And many developing countries are becoming more receptive to reforming the way energy is produced and consumed. This paper credits the "public monopoly" approach of the last 30 years with facilitating expansion of power supplies, capturing technical economies of scale, and making effective use of scarce managerial and technical skills. Nonetheless, it recommends several new policies to improve the performance of the electric power sector in developing countries. These reforms will guide future Bank activities in the sector. Bank loans for electric power will go first to countries clearly committed to improving the performance of their power sectors. The Bank will also discourage subsidies on energy prices and will encourage private investment in utilities. And it will provide financing to help the least developed countries import power where local generation is not practical. The efficiency of production and use of electric power in developing countries is examined in a companion paper, Energy Efficiency and Conservation in the Developing World: The World Banks Role . The World Bank's Role in the Electric Power Sector is also available in Spanish: La funcion del Banco Mundial en el sector de la electricidad. Politicas para efectuar una reforma institucional, regulatoria, y financieria eficaz. (ISBN 0-8213-2451-9) / Stock No. 12451 / $7.95 / Price code 007 / Spanis