Power outages are common in Argentina during the South American summer when temperatures can soar above 93 degrees (34 Celsius) and air conditioners are widely used.
Argentina's energy ministry says the government is evaluating compensating affected users.
The government of President Mauricio Macri blames the previous administration, saying energy subsidies and price freezes left the energy industry unprofitable and caused weaknesses in the power grid. Stock prices for utilities have shot up since Macri recently ended utility subsidies.