Title: Demand Aggregation as a Cost-Reduction Mechanism in Distributed Renewable Energy: Evidence from Blended-Finance Portfolios in Sub-Saharan Africa
Authors: Adetutu Olowu, Chioma Ezeokoye, Francis Owoeye
Volume: 10
Issue: 9
Pages: 8-23
Publication Date: 2026/09/28
Abstract:
This review examines demand aggregation as a mechanism for reducing the cost of distributed renewable energy deployment across Sub-Saharan Africa, with particular attention to blended-finance portfolios. It synthesizes conceptual, empirical, and comparative literature on energy access, financing gaps, procurement consolidation, transaction efficiency, risk pooling, portfolio diversification, operational performance, and scaling conditions. The analysis adopts a thematic review approach, integrating evidence from African and international studies to identify the channels through which aggregation can influence capital, procurement, financing, and lifecycle costs. Findings indicate that aggregation can improve project economics by spreading fixed transaction expenses across larger portfolios, strengthening purchasing power, standardizing technical and contractual processes, improving demand visibility, and creating investment volumes that are more compatible with institutional finance. Aggregated portfolios can also diversify customer, geographic, technological, and revenue risks, while blended-finance instruments such as concessional debt, guarantees, grants, first-loss capital, and results-based financing can absorb residual risks that aggregation alone cannot eliminate. However, the effectiveness of these mechanisms varies substantially with regulatory quality, institutional capacity, infrastructure maturity, market depth, technology configuration, and operational capability. Weak data systems, fragmented governance, currency exposure, and inadequate maintenance can erode anticipated cost savings. The review concludes that demand aggregation is most effective when treated as a structured market-building mechanism rather than simple project bundling. It recommends regulatory harmonization, standardized procurement and reporting frameworks, local-currency financing, targeted concessional support, stronger digital monitoring, and rigorous portfolio-level evaluation. Future research should quantify cost savings, financing-spread reductions, default correlations, and lifecycle performance across comparable blended-finance portfolios. These priorities can strengthen affordability, scalability, investor confidence, and sustainable energy access.