The coal supply to many generating stations, which supply power to Delhi, has been hit by cancellation and rescheduling of goods trains carrying the fuel due to dense fog.
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 two days, officials said.
A number of other coal-based power stations have also curtailed supply to Delhi, they said.
Technical glitches in a number of thermal power generating stations have also compounded the problem, the officials said.
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 3,955 MW.
