The countries of the Southern Cone of America are experiencing deep changes in their Energy area. The sustained growth in the demand of energy, in some cases at a yearly rate exceeding 7%, and the need of maintaining the long term cost of energy within competitive values, are moving the region to a higher energetic integration and to a diversification and optimisation of their resources.

Within this new transformation scheme, the existence of large natural gas regional reserves, plus the technological advances in thermoelectric generation, using combined cycles with natural gas, and with an efficiency near to 60%, offer clearly the lower cost long run marginal alternative for power generation. The great distance that exists between the gas fields and the consumer markets, the rates of growth and the concentration of the demand in certain areas, the need for the conversion of the electrical frequency amongst Brazil and the countries of the region, are subjects that have their influence and condition the decisions regarding investments in energy. In this context, the selection of the means for transporting the energy, by Natural Gas Pipelines (NGP) or Electrical Power Transmission Lines (EPTL) is starting to be an interesting subject of study for the specialists in energy.

The technical and economic comparisons performed between both transmission means allows us to arrive at some conclusions regarding the future range of application of each technology. This study submits the conclusions of the above mentioned comparison. It also shows the methodology used for its application to different situations than those assumed.

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