Utilities regulator chief, Janaka Ratnayake said the oil burnt in the furnaces had too much sulphur in it.
But the country’s energy minister has disputed the allegation.
Last week, Sri Lanka increased its daily power outage from eighty minutes to one hundred and forty minutes because of a drop in power generating capacity.
Ratnayake said about ten per cent of the country’s electricity came from diesel and fuel oil power plants.
