Country's northern region plunged into darkness yesterday evening as the HVDC inter-connection substation at Bheramara broke down.
The substation which receives 500MW of electricity from India tripped in the evening, leading to the blackout.
This also aggravated the load-shedding in the capital, official sources said.
The whole country experienced over 1,200MW of load-shedding, including nearly 500MW in Dhaka alone.
Confirming the breakdown of the HVDC grid substation, Managing Director of Power Grid Company of Bangladesh Masum Al Beruni told the news agency that the incident took place around 6:40pm. "We're now trying to repair the glitch that affected the power transmission system," he said.
On November 1, 2014, a similar breakdown led to the collapse of the country's whole transmission and generation system, plunging the nation into darkness.
PDB officials said they had to carry out a huge amount of load-shedding across the country due to the power generation shortfall by about 1,200MW.
They said the country generated about 8,500MW of power against a demand for over 9,500MW of electricity.
Harunur Rashid, director (operations) of DPDC, which distributes power to the western and central parts of Dhaka city, said their organisation was allocated about 1,100MW against a demand of 1,400MW. "Now, we've to go for at least 200MW load-shedding to cover the shortfall," he said.
Desco Director Noor Mohammad informed that they were directed to conduct about 180 MW load-shedding to manage the demand of 830MW.
Desco has been engaged in power distribution to the city's northwestern and eastern areas.
Meanwhile, residents of many areas of the city said they had to experience power cuts for hours on several spells yesterday.
People in the areas, including Moghbazar, Malibagh, Gulshan, Banani, Tejgaon, Kakrail, Mirpur, Mohammadpur and old part of the city, suffered most.