Access to electricity is one of instrument for development of any society nowadays, about 1.2 billion of people in the world are living without an electricity today. At least 600 million people in sub-Saharan African countries are live without electricity, and the Maputo province and Maputo city in Mozambique are not any exception faced with electrical shortage. The UN Sustainable Development Goal (SDG) 7 states that access to affordable, reliable, sustainable and modern energy for all people throughout the world should be achieved by the year 2030. The rate of electrification in the urban areas in Mozambique is about 67% and the national electrification rate is 40%. With higher energy potential resources such as coal, natural gas and renewable energy resources. Mozambique still has one of the low electricity consumption per capita in the region about 443 kWh which is paradoxes. The government of Mozambique has introduced reforms in the electricity sector since 1995 and considers the access to modern forms of supplying electricity to be highly important in the fight being waged against poverty. The objective of this research is to see the process of the gas conversion to electricity using the combined cycle gas and vapor at Maputo Power Plant in Maputo, Mozambique. In this secondment, the water quality analysis in the Power Plant that should be improved in order to have good energy production and the methods will be Desalination and demineralization of water from Maputo city.