The pledge was made by the Minister of Energy and Water Resources, Michael Ngako Tomdio after a tour last week of four thermal plants under construction in the country.Electricity supply in the country is expected to increase by 100 megawatts by December 2011 upon the completion of four thermal plants currently under construction in Bamenda, North West Region (20 Megawatts), Ahala, Yaounde and Mba