International power grid interconnections provide links between the electricity transmission systems of two or more adjoining countries, and thus allow those countries to share power generation resources. As different countries are differently endowed with natural resources, energy trade among countries, as it has for centuries helps to reduce energy prices and increase energy supply in importing countries, while providing a means of income for exporting countries. Most fuels can be transported by land or sea, by cart, freighter, truck, train, or tanker. Electricity, however, is generally not (yet) easily “storable” in bulk quantities, and must therefore be transferred by power lines.
International grid interconnections can be as modest as the one-way transfer of a small amount of electricity from one country to another, or as ambitious as the full integration of the power systems and markets of all of the countries in a region. Whatever the scale, international power grid interconnections can help to contribute toward the process of sustainable development. Grid interconnections can help to increase the supply and/or reliability of electricity for use in education, employment generation, health care, and many other development related activities, and can contribute toward the formation of competitive markets for electricity on national and regional scales, helping to potentially reduce the cost of electricity to developing economies. International power grid interconnections are often, however, extremely complex undertakings, with technical, economic, legal, political, social, and environmental issues (costs, benefits, and considerations) that must be taken carefully into account before and as arrangements for power sharing are made.

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