Comparing Off-Grid Solutions and National Grid Expansion in Africa’s Electrification Efforts

Introduction 

Sub-Saharan Africa remains the epicentre of global energy poverty. According to the International Energy Agency (IEA), 600 million people in the region remain unelectrified, accounting for almost 80% of the global unelectrified population (IEA, 2023). Despite extensive investments in national electricity grids over many decades, electrification levels have not kept up with population growth, especially in rural regions. This has reignited the debate between two conflicting but increasingly integrated strategies: scaling up national grids versus off-grid decentralised electrification. 

This article examines these approaches from a cost-benefit perspective, and in terms of their socio-economic effects. It suggests that it is no longer strictly about which approach is best in the abstract, but how to best use each in Africa's varied geographical, economic and institutional settings. 
The Economics of Grid Expansion: Scale versus Reality 

Traditionally, national grid expansion has been the preferred electrification model in Africa. Policy makers and development agencies have spent billions of dollars on transmission and distribution infrastructure, often citing economies of scale from centralised generation. This allows for low marginal cost generation from large-scale hydropower, gas and increasingly solar projects. 

But the capital costs of grid extension are a limiting factor. According to the World Bank, grid infrastructure extension costs in sub-Saharan Africa range from USD 1,500 to USD 3,000 per rural connection, depending on topography and distance (World Bank, 2022). In low-density areas, these costs soar, making grid expansion financially unsustainable. 

Additionally, African grids suffer from very high transmission losses (15-20% as opposed to a global average of 8% (IEA, 2023). Insufficient infrastructure, maintenance, and theft all play a role in reducing the efficiency that should be achieved in theory by centralised systems. 

Time is also of the essence. Grid expansion is slow, taking 5-10 years from design to implementation, stymied by regulatory, financial and governance problems. For rapidly growing rural communities, this means a longer wait for energy, with negative economic and social implications. 

Off-Grid Systems: Falling Costs and Rapid Deployment 

Off-grid systems, such as solar home systems (SHS), mini-grids and stand-alone renewable energy systems, are becoming an alternative option, especially for rural and remote areas. Solar photovoltaic (PV) costs have dropped by more than 80% in the last ten years, significantly shifting the economic landscape of off-grid systems (International Renewable Energy Agency, 2023). 

The levelised cost of electricity (LCOE) for off-grid PV systems is now between USD 0.20 and USD 0.50 per kWh, depending on the system size and financing model (IRENA, 2023). This is generally higher than the cost of grid electricity in urban areas, but is comparable or even lower than diesel generators, which are often used in off-grid areas. 

More importantly, off-grid solutions have lower upfront costs. Mini-grid connections currently range from USD 500 to USD 1,500 per household, making them more affordable in sparsely populated regions (World Bank, 2022). They are also quicker to deploy - usually within months. 

Adoption has also been boosted by new financial models. Pay-as-you-go (PAYG) models, facilitated by mobile money, have helped bring energy to the poor. Firms like M-KOPA and d.light have shown the potential for these models to scale, with millions of customers in East and West Africa. 
Cost-Benefit Trade-offs: Beyond Headline Figures 

Simple cost comparisons (per kWh or per connection) may oversimplify the complexities of grid versus off-grid deployments. A more comprehensive analysis requires consideration of reliability, scalability and economic integration into the broader economy. 

Functioning grid electricity enables high-drain uses like manufacturing, irrigation, and urban infrastructure. Solar home systems and other small off-grid systems tend to be restricted to lighting, mobile phone charging, and a few small appliances. This has important economic development implications. 

But grid electricity in many African countries is not reliable. Power outages, power fluctuations and load shedding decrease the value of grid connections. In some African countries, such as Nigeria, companies heavily depend on their own generation, with a backup generator supplying up to 40% of electricity in some industries (World Bank, 2023). 

In such cases, distributed energy sources can provide greater reliability. Solar and battery-powered mini-grids offer reliable electricity supply despite national grid fluctuations. This is a factor that matters for rural businesses, even if it means that they are not necessarily connected to the grid. 

The second key consideration is scalability. Grid electricity is scalable and can grow to meet demand. Off-grid solutions, on the other hand, may need to be replaced or upgraded. Yet, evolving modular designs for mini-grids are closing this gap, allowing for gradual expansion in line with demand. 

Socio-Economic Impacts: Inclusion, Equity, and Development 

Access to electricity is not just a technological, economic or commercial problem - it is a development one. The decision between grid and off-grid electrification has significant impacts on inclusion, equity and development. 

Off-grid electrification has had significant impacts on welfare. Research by the Energy Sector Management Assistance Program (ESMAP) has found that providing access to solar home systems leads to better educational performance, more productive time and a reduction in kerosene use (with health benefits) (ESMAP, 2022). 

Crucially, off-grid systems have been better at serving disadvantaged and remote communities. The expansion of the grid tends to focus on more economically profitable areas at the expense of the poor. Off-grid approaches, especially with subsidies and blended finance, can address these inequities. 

But there are affordability and equity issues. PAYG models, although novel, may increase the effective price for the poor due to financing costs. There is also a danger of a dual energy system between rural communities that will be limited to low-capacity off-grid systems and urban communities with high-capacity grid systems. 

Macroeconomically speaking, grid expansion is more related to structural change. Manufacturing, urban development and large-scale agricultural processing all demand large capacity electricity supplies that are not available through off-grid systems. This highlights the relevance of centralised infrastructure in national development plans. 

Environmental and Sustainability Considerations 

While both grid and off-grid systems are part of Africa's energy transition, their environmental impact varies. 

Many African countries still rely on fossil fuels (mainly gas and diesel) for their centralised grids. Although renewable energy has grown, the rate of transition varies. Although large hydropower installations are renewable, they bring environmental and climate change risks. 

Decentralised systems, especially solar, provide environmental benefits. They minimise fossil fuel use and greenhouse gas emissions. The United Nations Environment Programme identifies decentralised renewables as essential for achieving energy access for all while tackling climate change (UNEP, 2023). 

But there are sustainability issues. The sustainability of solar and battery systems is an emerging concern, with few recycling opportunities in Africa. Unless adequately regulated, the rapid uptake of off-grid systems may lead to environmental problems in the future. 

Towards a Hybrid Electrification Strategy 

It is clear that neither grid expansion nor off-grid approaches alone will enable universal electrification in Africa. A hybrid strategy is now seen as the optimal solution. 

The IEA forecasts that by 2030, almost 50% of the new electricity connections in sub-Saharan Africa will be served by off-grid and mini-grid, while the rest will be served by grid expansion (IEA, 2023). This is because it is clear that both models have their merits and weaknesses. 

Integrated planning is essential. Governments need to plan least-cost electrification strategies that incorporate the grid and off-grid, depending on geography and demography. Geospatial planning models and other tools being developed with the support of organisations such as the World Bank are helping inform decision-making. 

Regulatory and policy settings are also key. Transparent guidelines for mini-grid development, pricing and integration into the main grid are essential to attract private investors and ensure consumer protection. This is an area where countries like Kenya and Nigeria have advanced, but there is more to do. 

Funding remains a key challenge. An estimated USD 25 billion or more per year is needed to reach universal electrification in Africa (IEA, 2023). This requires a mix of public and private finance, and creative financing strategies. 

Conclusion 

The debate between off-grid and national grid roll-out in Africa is not a case of "or", but "and". National grid expansion provides the capacity and scale needed for long-term economic development, but is limited by cost, speed of deployment and institutional barriers. Off-grid technologies offer a cost-efficient and adaptable approach to serve the unserved, but suffer from capacity and scalability constraints. 

A rigorous, empirical analysis shows that the key to electrification in Africa is to harness the merits of these approaches in a holistic, context-aware policy framework. Governments need to look beyond their preferred ideologies to evidence-based approaches that are efficient and effective in delivering both economic and social benefits. 

In the end, electrification is not an end in itself. Africa's energy transition will not be evaluated based on the number of connections, but on its ability to generate better lives, inclusive growth and sustainable development. 

References 

• International Energy Agency (2023). Africa Energy Outlook 2023. https://www.iea.org/reports/africa-energy-outlook-2023  

• World Bank (2022). Tracking SDG7: The Energy Progress Report 2022. https://trackingsdg7.esmap.org  

• World Bank (2023). Nigeria Power Sector Recovery Program Report. https://www.worldbank.org  

• International Renewable Energy Agency (2023). Renewable Power Generation Costs in 2023. https://www.irena.org/publications  

• Energy Sector Management Assistance Program (2022). Off-Grid Solar Market Trends Report 2022. https://www.esmap.org  

• United Nations Environment Programme (2023). Global Environment Outlook and Energy Access Briefs. https://www.unep.org