Long Volta, Ghana’s long promise of hydroelectric power, transport, and sustenance, is under siege. Silting, illegal mining, pollution, encroachment, and waste from marine transport are slowly but irreversibly undermining its health. And the consequences are more than environmental; they strike at the heart of Ghana’s energy future.
The Trouble Brewing in the Waters
Over the past decade, multiple stresses that once seemed peripheral have begun converging:
- Silting and sedimentation: Runoff from deforested hillsides, unregulated mining (especially “galamsey”), and upstream land-use changes are sending huge volumes of sediment into the Volta River Basin. The silt fills reservoirs, reduces water storage, and clogs intakes at the dams.
• Illegal mining and pollution: Toxic chemicals like mercury and cyanide are used in some small‐scale and illicit mining operations. Wastewater from mining, along with agricultural fertilizers, enters tributaries and Lake Volta itself, reducing water quality and increasing turbidity. Fish stocks suffer; human health is at risk.
• Encroachment and loss of buffer zones: Forest cover and wetlands around Lake Volta and its tributaries have been lost. Settlements, farmlands, and even infrastructure are built ever closer to waterways. This erodes natural barriers that help filter sediment and pollution, intensifies runoff, and increases flood risk.
• Marine transport waste: Boats and ferries on Lake Volta leave behind oil, fuel residues, plastic waste, and other refuse. Combined with pollution flowing in from upstream, this adds to eutrophication (nutrient overloading) and the growth of aquatic weeds.
All of these feed into one central problem: reduced reservoir capacity, worsened water quality, more volatile water levels – conditions that are deadly for hydroelectric dams.
Akosombo & Kpong: Dams Under Stress
The two hydroelectric giants – Akosombo (approx. 1,020 MW capacity) and Kpong (circa 160 MW) – are vital pillars of Ghana’s electricity mix. When Lake Volta is healthy, these dams supply a substantial portion of Ghana’s power. But when the lake is compromised, the flow of electricity becomes erratic.
Some of the key impacts:
• Reduced generation capacity: Sediment buildup reduces the effective volume of the reservoir. In dry seasons, there is less “buffer” to maintain water levels needed for full power output. During severe droughts or lower rainfall, Akosombo may not reach optimal water levels, forcing generation cuts or load shedding.
• Higher maintenance costs and downtime: Silt and debris clog intakes, turbines, and spillways. Dirty water wears down mechanical parts faster. Dredging, sediment‐removal operations, and repairs are costly – not just in money, but in time and disruption.
• Spillage risks and flood events: When water inflows exceed the capacity to store, as during heavy rain or because reservoirs are already full (sometimes because upstream sediment has reduced storage), dam operators are forced to spill water. In 2023, Akosombo and Kpong undertook controlled spillages to prevent dam failure. These spillages released water downstream, flooding communities, damaging infrastructure, and sometimes cutting power supply when substations were inundated.
• Climate change compounding the problem: Scientific studies (for example the resilient infrastructure roadmap) show that rising drought intensity and flood variability threaten reliable hydropower generation. Less rainfall or shifts in rainy seasons can lower lake inflows; more intense storms may increase sediment loads.
The Fallout: Beyond Power Blackouts
The energy system doesn’t exist in isolation. When hydro generation becomes unstable, the ripple effects hit consumers, businesses, industry, and national development.
• Electricity supply becomes unreliable: To avoid dam damage or because generation drops, Ghana must often rely more on thermal power plants (gas, diesel) which are more expensive and emit more greenhouse gases. This pushes up tariffs, increases import bills for fuel, and increases vulnerability to global energy price shocks.
• Economic growth may be stifled: Industries like processing, manufacturing, mining itself, and export agriculture need stable power. Interruptions hamper productivity, increase waste, and reduce investment attractiveness.
• Cost to taxpayers grows: Maintaining dams, dredging silt, cleaning pollution, rebuilding damaged infrastructure from floods — these are costs that often land on the state or local communities.
• Environmental and health risks escalate: Polluted water causes disease, fish kills reduce food supply and incomes, biodiversity degrades. Communities downstream suffer not only power shortages, but disasters of health, water scarcity, and loss of livelihood. Also, reservoir siltation can lead to higher water temperature, reduced dissolved oxygen, affecting aquatic life.
What We’ve Seen Already: 2023 Spillage as Warning
A vivid example of what can go wrong is the 2023 spill from Akosombo and Kpong Dams:
• Heavy rains in catchment areas, coupled with high water levels, forced controlled spillages. Reservoirs were over maximum operating levels.
• Downstream communities across parts of the Volta Region were severely flooded. Substations and grid infrastructure were affected, cutting off power in some areas. Schools, hospitals, and homes were submerged; many people were displaced. Public health concerns soared; there was disruption to schooling and health services.
That event is a preview of what might become more frequent if the drivers of deterioration are not addressed.
Solutions & Way Forward
This is not a lost cause. Ghana has options – some immediate, some medium‐term, some long‐term – to protect Lake Volta, its dams, and its energy future.
Strategy What It Would Do
Strengthen regulation & enforcement of illegal mining & land‐use.
Reduce sediment loads; prevent toxic runoff; preserve watershed integrity.
Reforestation & buffer zones
Hills and riverbanks planted with trees help filter runoff, hold soil; marshes/wetlands as sponges for floodwater.
Dredging & sediment management Clear inlets, maintain reservoir capacity; though must be done sustainably and with environmental impact assessments.
Pollution control & improved sanitation Regulate wastewater, mining effluent; reduce plastic and fuel contamination from boats.
Monitoring, early warning & dam operations reform
Better rainfall/runoff data; reservoir level monitoring; guide spillage decisions to minimize downstream damage.
Diversification of energy mix
Invest more in solar, wind, natural gas, small hydro – to reduce overreliance on Akosombo & Kpong.
Public awareness and community involvement
Engage upstream communities, educate local people about impacts; involve them in conservation.
The Urgency: Time Is Not a Luxury
If current trends continue, here’s what might happen:
• Reduced hydropower output leading to frequent rolling blackouts, especially in dry seasons.
• Rising energy costs as more expensive thermal generation is used.
• Greater pressure on the national budget through subsidies or importing fuel.
• Worsening environmental degradation and public health crises.
• Loss of investor confidence as Ghana becomes seen as risky for stable power supply.
Lake Volta has powered Ghana for decades. But if we allow it to be degraded – through silt, pollution, unchecked mining, and encroachment – we threaten not just an ecosystem, but the backbone of Ghana’s energy system. Protecting the lake is not optional. It is vital.
Higher levels of political will, better regulation, strengthened environmental protection, and diversified energy strategy must become urgent pillars of policy. The future of Ghana’s power – and the wellbeing of millions dependent on it – depends on action today.
The author of this piece is Shadrack Odame Agyare. He is a journalist with the Ignite Media Group
Source: metrotvonline.com
