Developing countries face significant challenges in achieving energy stability due to disruptions in their energy supply chains, which jeopardise their sustainability and survivability. Addressing these issues requires careful consideration of public funding in the energy sector and the design of a robust electricity infrastructure. This study aims to identify long-term infrastructure investment strategies that can strengthen the viability of the energy supply network in developing countries, even with limited public funds. The research is underpinned by an empirical study that shows the successful development of energy infrastructure through the effective implementation of viable energy strategies in developing countries. By adopting these strategies, energy supply networks in developing countries can mitigate supply disruptions and avert economic losses. Further, this study evaluates the effectiveness of the viable energy supply network by incorporating a mix of energy resources based on actual data from Pakistan. The contributions of the study are as follows. We develop a viable energy supply network model that considers crucial elements, such as extraction, transportation, generation, transmission, and supply and facilities decision-making. Additionally, we show that the performance of the energy network is not only driven by electricity supply but also influenced by the overall economic growth of the country.