Mahaweli Hydro power complex consists of seven major power station which has an installed capacity of 775 MWs. We contribute around 15% electrical energy to the country annually The major power stations coming under Mahaweli complex are, Kotmale, Victoria, Randenigala, Rantambe, Ukuwela, Bowatenna, Upper Kotmale and Nilambe covering 1268 sqkm of Mahaweli basin.

Mahaweli project was implemented as a multipurpose irrigation and power generation project under the accelarated Mahaweli scheme which was started in early eighties with a view to complete within six years.