Acaray Dam
The power plant's switchyard has a HVDC back-to-back station built by Siemens in 1981. It has a power rating of and an operating voltage of . It converts the electrical frequency from 50 hertz to 60 hertz to supply electricity to Brazil's power grid, which operates at 60 Hz (Paraguay's power grid operates at a frequency of 50 hertz). This back-to-back station is inoperative since 03 September 2007. Culture It is depicted in the 50 guaranies coin in Paraguay.