Areas across east, west, north and south Delhi faced outages in the range of one to four hours due to the shortage as maximum power demand remained above 4,200 MW.
"The supply of power to Delhi fell by 1,400 MW due to various technical issues in some of the power plants from where we get electricity," said a power department official.
The supply from NTPC's Dadri plant in Uttar Pradesh came down by 800 MW while the Bawana plant in the city, which produces around 250 MW, was totally non-functional.
Power production at NTPC's Rihan plant in Uttar Pradesh as well as in Badarpur Thermal Power Ltd in Delhi was also severely affected resulting in shortage in supply.
"NTPC has told us that by tomorrow, the situation will improve," said the official.
Power demand in the city remained high at 4,278 MW. However, it was less than yesterday's high of 4,490 MW.
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"There was no power in our area for four hours. It was a difficult situation. We sweat like anything," said Manish Gupta of Janakpuri area in the city.
The erratic power supply also affected various water treatment plants in the city, resulting in shortage of water in the city.