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The transmission system operator in Uruguay (UTE) has contracted ALSTOM Grid to build a 500MW inter-connector with Brazil. As the 500kV transmission system in Uruguay operates at 50Hz and the Brazilian 525kV transmission system operates at 60Hz, HVDC becomes the most appropriate technology to inter-connect the two grids. This paper provides details of the design of the new 500MW HVDC back - to back inter-connector which will be located at the Melo sub-station. When constructed, the inter-connector will alleviate short term generation issues, by providing a strategic link to the large Brazilian energy market.