Spatial Dynamics and Socioeconomic Drivers of Urban Household Mini-Grids in Lubumbashi, DR Congo
This study analyzes a 2024–2025 survey of 5,270 households in Lubumbashi, DR Congo, revealing that privately operated urban mini-grids serve over 20% of residents primarily due to public grid unreliability rather than lack of access, with participation driven by income diversification and education rather than household income alone.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Electricity is often treated as a simple switch: a home is either connected to the national grid, or it is not. For decades, the global goal has been to flip that switch for everyone, extending power lines to every village and city block. However, in many rapidly growing cities across Africa, the reality is far more complicated. A house might be physically connected to the grid, yet the lights flicker and die for hours every day. When the official supply fails, people do not simply wait; they find their own ways to keep the lights on. They might buy a noisy diesel generator, install solar panels on their roof, or band together with neighbors to build a small, private power network. These private networks, known as mini-grids, are no longer just a temporary fix for remote villages. In cities like Lubumbashi in the Democratic Republic of the Congo, they are becoming a permanent, essential part of the urban landscape, filling the gaps left by an overburdened public system.
Researchers from the University of Lubumbashi recently set out to understand exactly how these private power systems are spreading through the city and who is using them. They wanted to move beyond the simple idea that only the poor or those without any grid access need these solutions. To get a clear picture, the team conducted a massive survey between 2024 and 2025, speaking directly to more than 5,000 households across the city. They mapped the location of every private power system they found and asked detailed questions about the families' jobs, education, and income. Their goal was to see if these decentralized systems were appearing randomly or if they followed a specific pattern driven by the city's growth and the reliability of the public electricity.
The results reveal a city that is powering itself in two distinct ways. The researchers found that 163 privately operated diesel mini-grids are currently supplying electricity to 1,143 households, which represents about 22 percent of the families they surveyed. These mini-grids are not scattered evenly; they are heavily concentrated in the outer edges of the city, in neighborhoods that are expanding quickly but where the public power lines are either missing or completely unreliable. In these areas, neighbors have pooled their resources to build a local network that runs on diesel fuel, creating a lifeline where the national grid has failed to keep up with demand.
Perhaps the most surprising discovery was that these private networks are not just for people who have no other choice. More than one-third of the diesel mini-grids the researchers found are located in neighborhoods that are already connected to the public electricity grid. The people living there are not disconnected; they are disconnected from reliable power. In these specific neighborhoods, households experience an average of 14 hours of power outages every single day. In contrast, neighborhoods with the public grid but no private mini-grids still suffer outages, but for a shorter average of 9 hours a day. This suggests that the main driver for building a private mini-grid is not the lack of a physical wire, but the failure of the service itself. When the public power becomes too unreliable to depend on, residents invest in their own independent systems to ensure their lights stay on.
The study also challenged the common assumption that money is the only factor deciding who joins these private networks. The researchers expected that wealthier families would be the ones able to afford the cost of a mini-grid subscription. However, the data showed that a household's total monthly income was not a strong predictor of whether they would join. Instead, two other factors mattered much more: the stability of their income and their level of education. Families where the head of the household had completed secondary school were significantly more likely to subscribe. Even more important was income diversification. Households that earned money from multiple sources—such as a mix of a salary, small business sales, and farming—were far more likely to join a mini-grid than those relying on a single source of income. This indicates that the ability to pay for electricity regularly depends less on how much money a family makes in total, and more on how steady and varied their income streams are.
The researchers also looked at who is buying individual generators versus who is joining a shared mini-grid. They found that wealthier households, particularly those with higher levels of education, tended to invest in their own standalone diesel generators or solar systems. These families could afford the high upfront cost of buying and maintaining their own equipment. In contrast, families with lower incomes, or those who needed a more affordable entry point, found the shared mini-grids to be a better option. By sharing the cost of the infrastructure, the mini-grid operator could offer electricity at a price that was accessible to a wider range of neighbors. This dynamic shows that the city is developing a layered energy system where different solutions serve different needs based on local economic conditions.
Ultimately, the picture that emerges from Lubumbashi is one of adaptation. The city is not waiting for the national grid to be fixed; it is building its own parallel system to survive. The privately operated diesel mini-grids have evolved from emergency backups into a core component of the city's energy infrastructure. They provide power where the grid is absent and, crucially, they provide reliability where the grid is present but broken. The study suggests that for urban planners and policymakers, the focus must shift. It is no longer enough to simply count how many homes are connected to a wire. The real measure of success must be whether that wire delivers power when it is needed. As African cities continue to grow, these private networks are proving to be a resilient, if imperfect, response to a system that cannot keep up, forcing a rethinking of how urban energy security is defined and planned for the future.
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