Video of the incident showed Adolfo Safran, the finance minister for the northeastern province of Misiones, answering a question on the rate hikes when a group of some 150 protesters barged in shouting "End the robbery!"
One protester hit the minister from behind before the TV crew managed to usher him to safety.
"Let's take a commercial break," said the presenter, as the scene descended into chaos yesterday night at Channel 12 in the city of Posadas.
Conservative President Mauricio Macri's government has sharply increased electricity rates since taking power in February, arguing that subsidies under his leftist predecessor were distorting the flagging economy.