Aggreko is owned by former Tennis player and business tycoon - Suresh Subramaniam, who is also a close friend of Prime minister Ranil Wickremesinghe.
Sources say that the main reason for this move is a power generator at the Norochcholai plant being inactive from 15 Oct. 2015 onwards.
Due to the generator remaining unrepaired, authorities have been compelled to purchase power for three plants.
According to the Tender on purchasing of electricity, Aggreko had made a bid of Rs. 36 per unit.
However, a unit of electricity was previously purchased from the private sector at a price of Rs. 23 while the cost of generating one unit of energy at Norochcholai stands at Rs. 13.