This book is an exploratory case study of the role of customers and society in the implementation of the Mega Hydropower Dam Projects. The existing literature emphasizes the negative socio-economic impact of such projects around the world. In this book, we discuss the effects of the Inga 1, Inga 2, and the High powerline Inga-Shaba (Katanga) on the customers and the whole Congolese society To inform our research, we used the lean Project management approach and the normative aspect of the stakeholder theory. We collected the data through the reading of previous works and existing documents. A secondary data qualitative method helped us to conduct to analyze the collected data. Following our findings, the needs and expectations of customers and the whole society, potential customers of the National Company of Electricity, were neglected by the persons who decided the initiation and the implementation of the three projects. The meeting of these needs and expectations is very determining for the success of the latter. We conclude by making some propositions to avoid similar errors in the initiation and implementation of the Projects Inga 3 and 4.