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This comprehensive strategy aims to increase energy access through a combination of technical and non-technical interventions. A key part of the roadmap is to incorporate Sierra Leone's abundant renewable energy resources, ensuring a secure energy supply to rural communities and boosting the national economy.
Sierra Leone currently has one of the lowest energy access rates globally, with only 36% of its population connected to the grid and a mere 6% in rural areas. The SOGREA Initiative supports the government's aim to increase the share of renewable energy in the country's energy mix to 35% by 2030. “By 2027, Sierra Leone will be fully illuminated.
This station, which currently has a generation capacity of 6MW, has the potential to double its output to 12MW. In addition to the Goma Hydropower Station update, Sierra Leone signed an MoU with the European Union earlier this month to deploy 57 solar mini-grids in rural communities that currently lack electricity.
A key part of the roadmap is to incorporate Sierra Leone's abundant renewable energy resources, ensuring a secure energy supply to rural communities and boosting the national economy. One of the most significant projects in this roadmap is the planned expansion of the Bumbuna Hydroelectric Dam.
This study provided the first spatially comprehensive analysis of solar and Wind energy Complementarity on a global scale. In addition, it showed which regions of the world have a greater degree of Complementarity between Wind and solar energy to reduce energy storage requirements.
Han et al. have proposed a complementarity evaluation method for wind, solar, and hydropower by examining independent and combined power generation fluctuation. Hydropower is the primary source, while wind and solar participation are changed in each scenario to improve power system operation.
The results highlight that strategically integrating Wind and solar generation offers a sustainable approach to boost the proportion of variable renewables within the power system, outperforming scenarios relying solely on a single renewable source.
Couto and Estanqueiro have proposed a method to explore the complementarity of primary wind and solar resources and the demand for electricity in planning the expansion of electrical power systems.
In their assessment of solar-wind complementarity in continental China, and using the Pearson correlation coefficient, Ren et al. found similar results to ours regarding the spatial distribution of synergy between these two VRES on a daily scale.
A further problem reducing the spatial coverage of studies, is a lack of uniform method applied in available studies. Therefore, this work contributes to the existing body of knowledge by providing a first spatially comprehensive analysis of solar and wind energy complementarity on a global scale.
Besides using Kendall's tau correlation as the complementarity metric, this research is based on a pair of indicators (a: solar share, and b: sizing coefficient) derived from a concept of sizing of stand-alone solar-wind hybrid generation to minimize fluctuations of energy production, consequently reducing the required energy storage capacity.
Among the primary findings of this paper, we can mention that Kendall's Tau ranges between –0.75 and 0.75, are in line with previous research for specific regions, and might work for a theoretical limit in applied research benefiting from solar-wind complementarity.
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