Railways have to either reschedule or cancel a number of goods trains due to dense fog in the last few days.
The coal supply to many generating stations, which supply power to Delhi, has been hit by shortage of coal.
"The power distribution companies have to resort to loadshedding due to cut in power supply by a number of generating stations," said an official.
Coal shortage at NTPC' Dadri power plant in neighbouring Uttar Pradesh has resulted in reduction of 300-500 MW of power to Delhi in the last three days. A number of other coal-based power stations have also curtailed supply to Delhi.
They said the Damodar Valley Corporation has curtailed supply to Delhi by 320 MW due a snag in its Mejia thermal power station today.
The Chandrapura power plant in Jharkhad has also reduced supply of around 200 MW power to Delhi due to "congestion in its transmission corridor", said the officials.
The maximum power demand in the city in the last 24 hours was recorded at 3,727 MW.
