^[1] The Acaray Dam is a hydroelectric dam situated in Hernandarias, Paraguay. It has an electrical output of 210 megawatts (280,000 hp), supplying 3% of Paraguay's electricity demand.

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Quick Facts Location, Coordinates ...

Acaray Dam
Location	Hernandarias, Paraguay
Coordinates	25°27′34″S 54°37′45″W
Owner(s)	Administracion Nacional de Electricidad
Dam and spillways
Type of dam	Gravity dam
Impounds	Acaray River
Height	185 m (607 ft)
Length	1,500 m (4,900 ft)
Spillway type	56 m3/s (2,000 cu ft/s)
Power Station
Installed capacity	210 MW (280,000 hp)

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The power plant's switchyard has a HVDC back-to-back station built by Siemens in 1981.^[2] It has a power rating of 55 megawatts (74,000 hp) and an operating voltage of 25 kV. 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.^[3]

It is depicted in the 50 guaranies coin in Paraguay. ^[4]

• List of power stations in Paraguay