The Guinea–Mali Power Interconnector has received fresh momentum with the African Development Fund (ADF) approving $25.79 million in additional financing on 10 December 2025. The package a $22 million loan and $3.79 million grant to Guinea raises the Guinea-side project cost from $346 million to $372 million and extends implementation to December 2028. This 225 kV transmission line forms a core segment of the West African Power Pool (WAPP), enabling hydropower exports from Guinea to address Mali’s persistent deficits.
Guinea holds substantial under-utilised hydropower capacity, while Mali faces chronic supply shortfalls driven by limited domestic generation and rising demand. The interconnector directly bridges these contrasting profiles, allowing surplus electricity to flow across borders and optimising regional generation assets under the WAPP framework.
AfDB project documentation confirms the $25.79 million will fund expanded transmission infrastructure, additional metering (targeting 37,500 new connections), and institutional capacity building. The project builds on the original 2017 approval and co-financing from the World Bank, European Investment Bank, European Union, and ECOWAS Bank for Investment and Development.
Electricity access remains a binding constraint for West African industry. World Bank data show regional access rates lag global averages, with rural coverage especially low in Mali and transmission bottlenecks limiting Guinea’s hydropower potential. The interconnector resolves this by exporting Guinea’s low-cost renewable power to Mali, reducing reliance on expensive diesel backups.
Quantified Cost Savings for West African Industries
AfDB economic modelling for the interconnection calculates an economic rate of return (ERR) of 20.57% and a net present value of EUR 321 million (baseline scenario), far exceeding the 10% hurdle rate. Sensitivity tests confirm viability even with 10% cost overruns or two-year delays (ERR remains 19.9%).
Broader WAPP integration delivers measurable industrial gains. World Bank analysis of similar West African interconnectors shows regional power trade can cut wholesale electricity costs by up to 40% (as demonstrated in the North Core project) and generate annual system-wide savings of $5–8 billion. For energy-intensive sectors agro-processing, manufacturing, and mining this translates to lower long-run marginal costs of $0.02–0.07 per kWh in importing markets. Reduced outages and cheaper power directly improve productivity: industries currently lose 5–10% of output annually to unreliable supply; reliable cross-border flows can cut those losses and support consistent operations in food processing and light manufacturing value chains across ECOWAS.
Linkages to AfCFTA and East/West Energy Trade Resilience
The Guinea–Mali line advances WAPP’s goal of a unified West African electricity market while aligning with the African Continental Free Trade Area (AfCFTA) energy protocol. AfCFTA explicitly promotes synergies with regional power pools (WAPP, EAPP, SAPP) to create a continental electricity market. This includes mitigating currency risk, enhancing market transparency through digitisation, and enabling cross-regional trade between West and East African pools.
For East/West resilience, WAPP interconnectors like this one diversify supply sources and reduce exposure to single-country shocks a model that strengthens continental resilience under AfCFTA. AfDB and World Bank estimates indicate full regional integration could save Africa $40 billion in capital spending by capturing economies of scale in hydropower and renewables. Guinea’s exports to Mali create a template for future WAPP–EAPP linkages, stabilising prices and supporting intra-African trade in processed goods and industrial inputs.
Execution remains critical. AfDB and World Bank evaluations of WAPP projects note procurement delays and coordination challenges in cross-border settings, with security factors adding complexity in Mali. Yet the project’s high ERR and proven WAPP benefits position it as a high-return intervention when paired with strong PPAs and regulatory harmonisation.
Maintenance and grid management capacity will determine long-term performance. AfDB assessments highlight that sustained funding for upkeep prevents transmission losses that otherwise erode savings. With these safeguards, the interconnector can deliver lasting efficiency gains.
As construction advances, the $25.79 million ADF investment serves as a targeted catalyst within WAPP’s master plan. It demonstrates how modest transmission funding unlocks larger regional value cheaper power for industry, optimized renewables, and stronger East/West linkages under AfCFTA.
This project underscores a practical pathway to resilient West African supply chains: reliable, tradable electricity lowers industrial costs, supports agro-processing and manufacturing expansion, and contributes to continental energy security. As WAPP and AfCFTA converge, similar interconnectors will reshape how West and East African economies balance supply, demand, and trade resilience in an integrated continental market.
