Zimbabwe Launches 500MW Floating Solar Project at Kariba Dam

Leveraging Underused Transmission Capacity

Zimbabwe is launching a 500MW floating solar project at the Kariba Dam, a move set to address long-standing transmission problems and energy shortages linked to climate change. The initiative aims to generate significant foreign currency by utilizing the dam's transmission infrastructure, which has historically operated far below its 1,200MW design capacity. This strategy focuses on making better use of existing assets, rather than just adding new power generation.

The Kariba Dam's transmission system has been unable to carry more than about 400MW for nearly twenty years, despite being designed for 1,200MW. The new 500MW floating solar project is designed to make fuller use of this underutilized capacity. By maximizing the existing transmission lines, the project expects to generate substantial revenue from wheeling charges paid in hard currency. This income is intended to strengthen the Zimbabwe Electricity Transmission Distribution Company (ZETDC) and help upgrade the national grid. A pilot phase of 250MW will allow for phased deployment and testing.

Diversifying the Economy and Earning Foreign Currency

The project also includes an innovative aquaculture component, with fish being raised beneath the floating solar panels. Minister Marian Chombo noted this could help revive and diversify the Kariba fishing industry, creating local jobs and economic opportunities. Additionally, mining and processing industries using this renewable energy will be eligible for carbon credits, boosting their standing in global markets. There is a recommendation for part of the revenue from these carbon credits to be reinvested in the Kariba community, supporting social projects, youth programs, and conservation efforts. This combined approach aims to increase foreign currency earnings through energy sales and carbon markets.

Boosting Energy Security Amid Climate Challenges

Climate change has severely impacted Zimbabwe's power generation, causing droughts and lower water levels at Lake Kariba. This has led to a sharp drop in generation capacity, often between 250-350MW recently, and even below 100MW for long stretches in 2023. Floating solar technology offers several benefits for developing countries, such as saving land, improving panel efficiency through water cooling, and reducing water evaporation – vital for dams like Kariba facing water shortages. The project's hybrid design combines daytime solar power with existing hydropower for nighttime use, ensuring a more stable energy supply. This approach avoids the need for new grid connections and supports Zimbabwe's goals to reduce carbon emissions and meet global climate commitments.

Project Financing and Agreements

The economic success of the project relies on its ability to generate steady income. The African Export-Import Bank (Afreximbank) is providing a $4.4 million facility to cover studies for feasibility and bankability. The Intensive Energy Users Group, which represents miners and other industrial customers, has agreed to purchase the power under a 20-year power purchase agreement (PPA). This long-term contract is key to ensuring predictable revenue for loan repayments and investor returns. The project's financial appeal is strengthened by its potential to earn money from both electricity sales and carbon credits, attracting international investors interested in environmentally sound projects. The final cost-effectiveness will be influenced by the PPA's specific terms and global carbon credit prices.

Growing Trend in Floating Solar Projects

Floating solar installations are becoming more common across Africa, helping to address land shortages and improve grid stability. Countries like Egypt and Morocco have already shown the potential of this technology, often connecting it to existing hydro or grid systems. Floating solar uses water bodies, avoiding competition for land needed for farming or housing, which is particularly beneficial for countries with limited space. Combining solar with hydropower, as this project does, follows successful models elsewhere for diversifying energy sources and stabilizing power output. This trend towards hybrid renewable energy projects is attracting investment from development banks and private equity firms seeking scalable and reliable energy solutions.

Economic Factors and Project Benefits

The project's success also depends on Zimbabwe's overall economic conditions and its capacity to attract and manage foreign investment. Concerns about currency fluctuations and difficulties in repatriating funds have historically affected investor confidence, even with support from Afreximbank and the industrial buyer. The project offers clear benefits such as improved energy output from cooler solar panels and reduced water loss from evaporation, which are important for a region concerned about water resources and a dam vital for national power. Using existing transmission lines also offers significant cost savings compared to building new infrastructure, a common obstacle for renewable energy projects in developing countries.

Potential Challenges and Risks

The Kariba floating solar project faces significant challenges, including risks related to its execution and Zimbabwe's difficult operating environment. While the project is described as "resilient and future-facing," its reliance on external financing like Afreximbank could raise questions about long-term funding and project terms, especially if not handled transparently to benefit local interests. The Intensive Energy Users Group, despite committing to buy power, represents industrial clients whose financial stability is linked to global commodity prices and Zimbabwe's exports. This could affect their ability to meet PPA terms during economic slowdowns.

Furthermore, the long-standing issue of underutilized transmission lines at Kariba, while seen as an opportunity, might also indicate underlying structural problems within the ZETDC, such as inadequate maintenance budgets or regulatory hurdles that could limit the full benefit of transmission fees. The aquaculture element, though promising for local development, adds operational complexity to the large energy project, requiring specific expertise and market access that may not be fully developed. Government calls for reinvesting revenue into the Kariba community, while well-intentioned, may present governance issues and risks of mismanagement, which are concerns for investors in emerging markets. The project's reliance on existing hydropower for nighttime energy means that the ongoing risks to Kariba's water levels from climate change remain a factor in the hybrid system's overall reliability.

Next Steps and Future Vision

Feasibility studies for the Kariba floating solar project are in progress, with Afreximbank reportedly nearing the end of its consultant selection process. This initiative represents Zimbabwe's first operational floating solar facility, marking a major advancement in energy diversification and the adoption of advanced renewable technologies. The government sees this project as crucial for national energy security, industrial expansion, and a sustainable future. The goal is for Kariba to become a leading example of hydropower innovation. Successful execution could lead to similar projects at other water bodies, such as the Mutirikwi Dam.