The workers, under the aegis of the Nigerian Labour Congress and the Trade Union Congress, have thronged the offices of the DisCos on Monday, preventing workers from resuming work for the day.
In Lagos, the workers were sighted at the corporate headquarters of the Ikeja Electricity Distribution Company, singing and calling for the reversal of the Band A tariff.
In Oyo, protesters stormed the office of the Ibadan Electricity Distribution Company, picketing the same.
It was gathered that policemen were in attendance to forestall any breakdown of law and order.
The NLC and TUC gave the Nigerian Electricity Regulatory Commission a seven-day ultimatum to reverse the revised tariff.
However, the Federal Government said a reversal of the tariff would spell doom for the power sector, urging Nigerians to bear the temporary pains.
Amid this, the International Monetary Fund has advised the Federal Government to remove electricity subsidies in other bands to save the economy.