## 6 Conclusions  
The wind speed potential in the Asal-Ghoubbet rift zone was evaluated with the Weibull distribution. A comparison of 42 wind turbines in the power range of 1-5 MW was conducted to assess their performance in adapting to the wind speed regime of Ghoubbet at 80 m height, as well as for the evaluation of unit costs of electricity produced. The Yinhe GX113-2.5 MW wind turbine was found to be the most efficient in terms of energy production (18,606.6 MWh/year) and to have the lowest unit electricity cost ($0.042/KWh) for this site. PEME\({}_{\text{m}}\) and AWE\({}_{\text{i}}\) electrolyzers could produce approximately 124.04 tons H\({}_{2}\)/MW/year and 159.48 tons H\({}_{2}\)/MW/year, respectively. The cost of producing hydrogen from a Yinhe GX113-2.5 MW wind turbine was estimated to be $1.045/kg H\({}_{2}\) and $0.672/kg H\({}_{2}\) for the AWE\({}_{\text{i}}\) and PEME\({}_{\text{m}}\) electrolyzers, respectively. In this case, wind energy can reduce emissions by 2061.6 tons CO\({}_{2}\)/MW/year, assuming no degradation of wind capacity. The potential of the Asal geothermal reservoir was evaluated using the USGS volumetric method at 67.18 MWe. A dry steam plant and a single flash power plant were selected for electricity production from a geothermal resource. Thermodynamic and thermo-economic analyses were carried out to compare the performance of these two geothermal plants in order to select the most appropriate for the Asal geothermal site. The cost of electricity from \begin{table}
\begin{tabular}{c c c c c} \hline  & **Unit** & **Wind Turbine** & **Dry Steam \({}^{*}\)** & \\  & & & **Power Plant** & **Single Flash \({}^{*}\) Power Plant** \\ \hline Rated power & MW & 2.5 & 22.22 & 4.91 \\ Energy output & MWh/year & 18,606.6 & 175,186.6 & 38726.3 \\ Hydrogen produced & Tons/MW/year & 124.04 & 91.92 & 91.96 \\ CO\({}_{2}\) avoided & Tons/MW/year & 2061.6 & 2183.9 & 2184.8 \\ Fuel oil saved & bbl/MW/year & 4540.02 & 4809.354 & 4811.216 \\ Energy cost & \$/kWh & 0.042 & 0.086 & 0.125 \\ Hydrogen cost & \$/kg & 0.672 & 5.80 & 8.16 \\ \hline \end{tabular} \({}^{*}\)Irreversible operation case.  
\end{table} 
Table 6: Comparative analysis of hydrogen production from wind and geothermal energy using PEME electrolyzer. geothermal energy is evaluated at $0.1253/KWh and $0.0867/KWh for a single flash and dry steam geothermal power plant, respectively. The combination of a single flash power plant with HTE and PEME\({}_{\text{m}}\) electrolyzers resulted in a hydrogen production cost of $4.78/kg H\({}_{2}\) and $8.16/kg H\({}_{2}\), respectively. However, with the combination of dry steam with HTE and PEME\({}_{\text{m}}\) electrolyzers, the hydrogen production cost is evaluated at approximately $3.46/kg H\({}_{2}\) and $5.80/kg H\({}_{2}\), respectively. In addition, dry steam and single flash power plants can save 2183.9 tons CO\({}_{2}\)/MW/year and 2184.8 tons CO\({}_{2}\)/MW/year, respectively. The overall results show that the Asal-Ghoubbet Rift area can produce energy and green hydrogen at a low cost using wind energy compared to geothermal energy. **Supplementary Materials:** The following are available online at [[https://www.mdpi.com/article/10.3390/en15010138/s1](https://www.mdpi.com/article/10.3390/en15010138/s1)]([https://www.mdpi.com/article/10.3390/en15010138/s1](https://www.mdpi.com/article/10.3390/en15010138/s1)): Figure S1. A schematic geological map of the Republic of Djbouti (SE Afar Rift) and hydrothermal activity of the Republic of Djbouti. In the inset: schematic map of the Afar Depression with the location of Djbouti (black rectangle); Figure S2. Annual wind direction for Ghoubbet at level of 60 m of year 2015; Figure S3. Different equipment of RO, Guangzhou Kai Yuan Water Treatment Equipment Co. Ltd; Figure S4. Probability distribution of Monte Carlo simulation of Area of Asal-Ghoubbet Rift in m\({}^{2}\); Figure S5. Probability distribution of Monte Carlo simulation of Thickness of Asal-Ghoubbet Rift; Figure S6.