Project Spotlight


17.3 MW / 15.4 MWh
Renewables plus energy storage become cost-competitive at an off-grid mine in Mali


Wärtsilä Energy Storage and GEMS Power Fekola Mine in Hybrid Project

B2Gold, a Canadian public gold-mining company, operates a large gold mine in southwest Mali, Africa. Seeking a clean energy solution to improve energy generation and energy security at the off-grid mine, including integration of existing energy assets (solar and engines), B2Gold chose a hybrid solution to reduce their fuel-dependence, cut carbon emissions and optimise mining operations at the Fekola Mine. Wärtsilä has partnered with B2Gold to deliver the solution. Wärtsilä’s GEMS Digital Energy Platform, an advanced energy management software, integrates, controls and optimises a 17.3 MW / 15.4 MWh energy storage system alongside a 30 MW solar photovoltaic plant onsite, in addition to the mine’s existing 64 MW fuel generator.

Main Data

Customer B2Gold
Site Size 17.3 MW / 15.4 MWh
Site Location Mali, Africa
Application Microgrid control
Scope of Services EEQ with installation supervision
Delivery 2020

Wärtsilä energy storage and GEMS power Fekola mine hybrid project

B2Gold, a Canadian public gold-mining company, operates a large gold mine in southwest Mali, Africa. Seeking The project will hybridise the energy supply of Fekola to reduce the facility’s dependence on imported heavy fuel oil, saving operational and transportation costs, as well as lower greenhouse gas emissions.

The application of the project is to maintain microgrid stability, in addition to the curtailment of ramp events, the elimination of engine and solar power fluctuations and the provision of spinning reserves. GEMS will use automated and forecasted data, including load demand and weather, to enable energy production optimisation, ensuring the lowest Levelised Cost Of Electricity (LCOE) for the mine.

The renewables plus storage solution is both cost competitive as well as environmentally beneficial. Payback on the project is expected in only a few years and carbon emissions are projected to reduce by approximately 86 million pounds per year.


Fekola – A Hybrid PV, Storage, Thermal-powered Gold Mine

Wärtsilä and B2Gold describe how there is no compromise for mining microgrids, using the Fekola gold mine project in Mali as a reference case—reduce operational costs and go green.


Wärtsilä's Solution


Optimise energy production at a fuel-dependent, energy-intensive operational mining facility in southwest Africa

Complete asset optimisation via GEMS automated and forecasted data to enable energy production security and efficiency

Reduced carbon emissions, fuel consumption and mining operational costs

Ensure grid stability and provide energy security to a remote mine where energy from the local grid is unavailable and/or unreliable

An integrated hybrid energy solution, incorporating an energy storage system, an existing solar array, an existing power generator, and industry-leading energy management controls

Improved power reliability via storage energy generation capabilities

Integrate and optimise multiple renewable assets under a single portfolio

Sustainable clean energy addition to the mine

Short payback period ensuring the lowest LCOE


Energy storage market opportunities and potential in Africa

Wärtsilä discusses alongside the World Bank and ATA Insights the rationale for hybridisation in Africa, including the challenges and benefits of optimised solution design and hybrid plant integration