What Is Still Necessary for Supporting the SDG7 in the Most Vulnerable Contexts?

The common agreement of the United Nation members pushes the 2030 Agenda ahead to alleviate poverty and ensure wellbeing for all, recognizing energy as a crucial pathway to achieving this goal under three core dimensions: human development, sustainable economic growth, and environmental sustainability. Affordable and clean energy is represented by the Sustainable Development Goal 7 (SDG7). This great scope represents a multifaceted challenge for all countries, especially for the most disadvantaged environments such as small islands and rural areas from developing countries. Both small islands and rural areas experience a scarcity of goods and services such as energy and are isolated from markets, have lack of human resources, difficulties in deploying economies of scale, and other issues that affect their development. Along the same line, their energy security is limited by their dependence on imported fuels, increasing electricity prices or making it infeasible to access electricity. This research builds the state of the art of off-grid energy systems for both contexts based on an extensive review of literature. The evidence shows that moving sustainable energy systems forward requires getting more people involved, the application of several business models, prevalent technological innovations, and the application of technical quality procedures. This perspective would really help to address the vulnerabilities of fragile locations. Here, auctions, the Energy Service Company, community, and Pay-As-You-Go (PAYG) models and renewable energy projects based on mature technology present a great opportunity for a sustainable future, powering a nexus among energy, environment, and society.