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How Optimized Energy Management Delivers Reliability, Efficiency and Sustainability at Fekola Mine in Mali

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Fekola Mine Mali

By Luke Witmer

Since B2Gold first acquired the Fekola gold mine, located in a remote corner of southwest Mali, exploration studies revealed the deposits to be almost double the initial estimates.

A recent site expansion has just been completed, and while the existing power units provide enough power to support the increase in production, the company sought to reduce its energy costs, cut greenhouse gas emissions, and increase power reliability.

The addition of a 35MWp solar photovoltaic (PV) plant and 17MW/15MWh of energy storage to the existing 64MW thermal engine plant was decided. This new energy mix is anticipated to save over 13 million litres of fuel, reduce carbon emissions by thirty-nine thousand tons per year, and generate a payback in just over four years.

Such an elaborate hybrid configuration needs a powerful brain to deliver on all its potential: Wärtsilä’s GEMS, an advanced energy management system, has been set up to control the energy across the fleet of power sources, thermal, renewable, and battery storage.

The integration, control, and optimization capabilities provided by GEMS allow the thermal units to be run at the most efficient rate and enable the battery storage to handle the large load step changes and volatility of the solar PV generation assets.

Integrated Hybrid Energy Solution

In the context of the Fekola mine, which is an off-grid electrical island, the battery is performing a lot of different services simultaneously, including frequency response, voltage support, shifting solar energy, and providing spinning reserves. The energy load is very flat, with a steady consumption rate around 40MW as the mining equipment is operating consistently, 24/7.

However, if an engine trips offline and fails, the battery serves as an emergency backstop. The controls reserve enough battery energy capacity to fill the power gap for the time it takes to get another engine started and the software inside each inverter enables the battery to respond instantaneously to any frequency deviation.

The reciprocating engines operate most efficiently at 85-90 per cent of their capacity, this is their “sweet spot”. But if there is a sudden spike in demand, if a little more power is needed, or if mining equipment is coming online, then another engine needs to be run to meet the extra load. With the battery providing spinning reserves, the engines can be kept running at their sweet spot, reducing the overall cost per kilowatt-hour.

Moreover, with the solar plant providing power during the day, three to four engines can be shut down over this period, providing a quiet time to carry out preventive maintenance. This really helps the maintenance cycle, ensuring that the engines operate in a more efficient manner.

Solar PV volatility can be intense. On a bright day with puffy clouds passing by a solar farm of this size can easily see ramps of 25MW over a couple of minutes. This requires intelligent controls, dynamically checking the amount of solar that can be let into the grid without causing an issue for the engine loadings or without overloading the battery.

Conducting the Orchestra

The GEMS intelligent software provides the optimization layer that controls all the power sources to ensure that they work together in harmony. The user interface (UI) gives access to all the data and presents it in a user-friendly way.

Accessible remotely, all operations are simulated on a digital twin in the cloud to verify the system controls and simulate the most efficient operating scenarios to lower the cost of energy. This is an important software feature, both during and after commissioning as it allows operators to train on the platform ahead of time and familiarise themselves with the automated controls and dynamic curtailment of renewables. The UI provides the forecast for renewables and the battery charge status at any given moment, it can provide push email or phone notifications for alerts; telling operators when to turn off an engine and when to turn it back on.

The software is constantly analysing the data and running the math to solve the economic dispatch requirements and unit commitment constraints to ensure grid reliability and high engine efficiency. Load forecasting integrates the different trends and patterns that are detectable in historic data as well as satellite-based solar forecasting to provide a holistic approach to dispatching power. The Fekola site has a sky imager, or cloud tracking camera with a fisheye lens, that provides solar forecasts for the next half hour in high temporal resolution.

To ensure that operators really understand the platform, and have visibility over the advanced controls, the UI provides probability distributions of the solar forecast. Tracking the forecast errors enables operators to see whether the solar is overproducing or underproducing what the forecast was expecting at the time and provides visibility to the operators on the key performance indicators. This feedback is an important part of the machine/human interface and provides operators with insight if an engine is required to be turned on at short notice.

Automated curtailment enables the optimization of the system providing a reactivity that people cannot match. By continually monitoring the engine loadings and battery, the system is ready to clamp down on solar if it gets too volatile or exceeds some spinning reserve requirement.

For example, if a large, unexpected cloud arrives, the battery is dispatched to fill the gap while the engines ramp up. Once the cloud disappears, however, the engines remain committed to operating for a few hours, and the solar power is transferred to recharge the battery.

Over time, as load patterns shift, the load forecasting algorithm will also be dynamically updated to match the changing realities of the load. As mining equipment hits layers of harder rock, increasing the power load, the system will adjust and dispatch the engines accordingly.

Hybrid solutions will become the new gold standard for off-grid heavy energy users

The Fekola mine project incorporates the largest off-grid hybrid power solution in the world, demonstrating the growing case for clean energy and its sustainable and economic potential for mines in Africa and beyond.

As the cost of batteries and solar panels continues to become more competitive, hybrid solutions are proving to be a realistic and effective means for increasing energy reliability and lowering operating costs in any context, thus freeing up resources to improve the human condition; whether through cheaper materials and gainful employment, or by providing broader access to reliable electricity for healthcare, education, and improved quality of life.

Luke Witmer is the General Manager, Data Science at Wärtsilä Energy Storage and Optimization

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The Future of Payments: Key Trends to Watch in 2025

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Luke Kyohere

By Luke Kyohere

The global payments landscape is undergoing a rapid transformation. New technologies coupled with the rising demand for seamless, secure, and efficient transactions has spurred on an exciting new era of innovation and growth. With 2025 fast approaching, here are important trends that will shape the future of payments:

1. The rise of real-time payments

Until recently, real-time payments have been used in Africa for cross-border mobile money payments, but less so for traditional payments. We are seeing companies like Mastercard investing in this area, as well as central banks in Africa putting focus on this. 

2. Cashless payments will increase

In 2025, we will see the continued acceleration of cashless payments across Africa. B2B payments in particular will also increase. Digital payments began between individuals but are now becoming commonplace for larger corporate transactions. 

3. Digital currency will hit mainstream

In the cryptocurrency space, we will see an increase in the use of stablecoins like United States Digital Currency (USDC) and Tether (USDT) which are linked to US dollars. These will come to replace traditional cryptocurrencies as their price point is more stable. This year, many countries will begin preparing for Central Bank Digital Currencies (CBDCs), government-backed digital currencies which use blockchain. 

The increased uptake of digital currencies reflects the maturity of distributed ledger technology and improved API availability. 

4. Increased government oversight

As adoption of digital currencies will increase, governments will also put more focus into monitoring these flows. In particular, this will centre on companies and banks rather than individuals. The goal of this will be to control and occasionally curb runaway foreign exchange (FX) rates.

5. Business leaders buy into AI technology

In 2025, we will see many business leaders buying into AI through respected providers relying on well-researched platforms and huge data sets. Most companies don’t have the budget to invest in their own research and development in AI, so many are now opting to ‘buy’ into the technology rather than ‘build’ it themselves. Moreover, many businesses are concerned about the risks associated with data ownership and accuracy so buying software is another way to avoid this risk. 

6. Continued AI Adoption in Payments

In payments, the proliferation of AI will continue to improve user experience and increase security.  To detect fraud, AI is used to track patterns and payment flows in real-time. If unusual activity is detected, the technology can be used to flag or even block payments which may be fraudulent. 

When it comes to user experience, we will also see AI being used to improve the interface design of payment platforms. The technology will also increasingly be used for translation for international payment platforms.

7. Rise of Super Apps

To get more from their platforms, mobile network operators are building comprehensive service platforms, integrating multiple payment experiences into a single app. This reflects the shift of many users moving from text-based services to mobile apps. Rather than offering a single service, super apps are packing many other services into a single app. For example, apps which may have previously been used primarily for lending, now have options for saving and paying bills. 

8. Business strategy shift

Recent major technological changes will force business leaders to focus on much shorter prediction and reaction cycles. Because the rate of change has been unprecedented in the past year, this will force decision-makers to adapt quickly, be decisive and nimble. 

As the payments space evolves,  businesses, banks, and governments must continually embrace innovation, collaboration, and prioritise customer needs. These efforts build a more inclusive, secure, and efficient payment system that supports local to global economic growth – enabling true financial inclusion across borders.

Luke Kyohere is the Group Chief Product and Innovation Officer at Onafriq

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Ghana’s Democratic Triumph: A Call to Action for Nigeria’s 2027 Elections

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ghana election 2024

In a heartfelt statement released today, the Conference of Nigeria Political Parties (CNPP) has extended its warmest congratulations to Ghana’s President-Elect, emphasizing the importance of learning from Ghana’s recent electoral success as Nigeria gears up for its 2027 general elections.

In a statement signed by its Deputy National Publicity Secretary, Comrade James Ezema, the CNPP highlighted the need for Nigeria to reclaim its status as a leader in democratic governance in Africa.

“The recent victory of Ghana’s President-Elect is a testament to the maturity and resilience of Ghana’s democracy,” the CNPP stated. “As we celebrate this achievement, we must reflect on the lessons that Nigeria can learn from our West African neighbour.”

The CNPP’s message underscored the significance of free, fair, and credible elections, a standard that Ghana has set and one that Nigeria has previously achieved under former President Goodluck Jonathan in 2015. “It is high time for Nigeria to reclaim its position as a beacon of democracy in Africa,” the CNPP asserted, calling for a renewed commitment to the electoral process.

Central to CNPP’s message is the insistence that “the will of the people must be supreme in Nigeria’s electoral processes.” The umbrella body of all registered political parties and political associations in Nigeria CNPP emphasized the necessity of an electoral system that genuinely reflects the wishes of the Nigerian populace. “We must strive to create an environment where elections are free from manipulation, violence, and intimidation,” the CNPP urged, calling on the Independent National Electoral Commission (INEC) to take decisive action to ensure the integrity of the electoral process.

The CNPP also expressed concern over premature declarations regarding the 2027 elections, stating, “It is disheartening to note that some individuals are already announcing that there is no vacancy in Aso Rock in 2027. This kind of statement not only undermines the democratic principles that our nation holds dear but also distracts from the pressing need for the current administration to earn the trust of the electorate.”

The CNPP viewed the upcoming elections as a pivotal moment for Nigeria. “The 2027 general elections present a unique opportunity for Nigeria to reclaim its position as a leader in democratic governance in Africa,” it remarked. The body called on all stakeholders — including the executive, legislature, judiciary, the Independent National Electoral Commission (INEC), and civil society organisations — to collaborate in ensuring that elections are transparent, credible, and reflective of the will of the Nigerian people.

As the most populous African country prepares for the 2027 elections, the CNPP urged all Nigerians to remain vigilant and committed to democratic principles. “We must work together to ensure that our elections are free from violence, intimidation, and manipulation,” the statement stated, reaffirming the CNPP’s commitment to promoting a peaceful and credible electoral process.

In conclusion, the CNPP congratulated the President-Elect of Ghana and the Ghanaian people on their remarkable achievements.

“We look forward to learning from their experience and working together to strengthen democracy in our region,” the CNPP concluded.

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The Need to Promote Equality, Equity and Fairness in Nigeria’s Proposed Tax Reforms

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tax reform recommendations

By Kenechukwu Aguolu

The proposed tax reform, involving four tax bills introduced by the Federal Government, has received significant criticism. Notably, it was rejected by the Governors’ Forum but was still forwarded to the National Assembly. Unlike the various bold economic decisions made by this government, concessions will likely need to be made on these tax reforms, which involve legislative amendments and therefore cannot be imposed by the executive. This article highlights the purposes of taxation, the qualities of a good tax system, and some of the implications of the proposed tax reforms.

One of the major purposes of taxation is to generate revenue for the government to finance its activities. A good tax system should raise sufficient revenue for the government to fund its operations, and support economic and infrastructural development. For any country to achieve meaningful progress, its tax-to-GDP ratio should be at least 15%. Currently, Nigeria’s tax-to-GDP ratio is less than 11%. The proposed tax reforms aim to increase this ratio to 18% within the next three years.

A good tax system should also promote income redistribution and equality by implementing progressive tax policies. In line with this, the proposed tax reforms favour low-income earners. For example, individuals earning less than one million naira annually are exempted from personal income tax. Additionally, essential goods and services such as food, accommodation, and transportation, which constitute a significant portion of household consumption for low- and middle-income groups, are to be exempted from VAT.

In addition to equality, a good tax system should ensure equity and fairness, a key area of contention surrounding the proposed reforms. If implemented, the amendments to the Value Added Tax could lead to a significant reduction in the federal allocation for some states; impairing their ability to finance government operations and development projects. The VAT amendments should be holistically revisited to promote fairness and national unity.

The establishment of a single agency to collect government taxes, the Nigeria Revenue Service, could reduce loopholes that have previously resulted in revenue losses, provided proper controls are put in place. It is logically easier to monitor revenue collection by one agency than by multiple agencies. However, this is not a magical solution. With automation, revenue collection can be seamless whether it is managed by one agency or several, as long as monitoring and accountability measures are implemented effectively.

The proposed tax reforms by the Federal Government are well-intentioned. However, all concerns raised by Nigerians should be looked into, and concessions should be made where necessary. Policies are more effective when they are adapted to suit the unique characteristics of a nation, rather than adopted wholesale. A good tax system should aim to raise sufficient revenue, ensure equitable income distribution, and promote equality, equity, and fairness.

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