New Delhi, Oct 7 (IANS) With shortage of coal and water in various power plants affecting generation, Delhi power distribution firms resorted to load shedding, affecting power supply to the capital Friday.

'Coal and water shortage in various power plants has led to a reduction of power supply to Delhi. Throughout the day today, power supply to Delhi kept on fluctuating - reducing by as-much as 900 mw for certain periods,' said power distribution firm BSES in a statement.

'The shortage has reduced availability of power to the Delhi Discoms, forcing them to overdraw heavily from the Northern Grid,' said the statement.

'Due to coal shortages and wet coal, NTPC's Dadri I, II, Singrauli, Rihand -II, Farakka and Kahalgaon I and 2 were able to generate and supply significantly less power than their installed capacities,' it added.

'Mining and loading of coal has been badly affected due to heavy rains and the ongoing festival season in the mining areas in the east,' the statement stated.