## 3 Results and Discussion
### Propagation of Uncertain Input Variables to Estimate the Electric Generation
Consequently, the study of these low-generation zones is key in the design of generation mixes with strong contributions of renewable generation; therefore, these aspects are emphasized below. First, it is essential to determine the number of hours with low generation in each location. Figure 9 illustrates the annual hours with generation below the commonly used thresholds for low generation, i.e., 5%, 10%, and 20%. These values are \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Locations**} & \multicolumn{5}{c}{**Generation (MWh)**} & \multirow{2}{*}{**CF**} \\ \cline{2-2} \cline{4-5}  & **Min.** & **Max.** & **Mean** & **Median** & \\ \hline HW-HS & 3189 & 3906 & 3534 & 3525 & 0.403 \\ \hline HW-MS & 2305 & 2908 & 2608 & 2620 & 0.298 \\ \hline HW-LS & 3613 & 4370 & 4018 & 4042 & 0.459 \\ \hline MW-HS & 1923 & 2546 & 2210 & 2200 & 0.252 \\ \hline MW-MS & 1907 & 2512 & 2201 & 2200 & 0.251 \\ \hline MW-LS & 1727 & 2294 & 1957 & 1954 & 0.223 \\ \hline LW-HS & 906 & 1453 & 1127 & 1119 & 0.129 \\ \hline LW-MS & 818 & 1480 & 1082 & 1040 & 0.124 \\ \hline LW-LS & 1037 & 1420 & 1170 & 1144 & 0.134 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Summary of the main statistical variables for the wind generation in the nine Earth locations. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Locations**} & \multicolumn{5}{c}{**Generation (MWh)**} & \multirow{2}{*}{**CF**} \\ \cline{2-2} \cline{4-5}  & **Min. ** & **Max. ** & **Mean** & **Median** & \\ \hline HW-HS & 1900 & 1928 & 1914 & 1915 & 0.218 \\ \hline HW-MS & 1721 & 1759 & 1742 & 1743 & 0.199 \\ \hline HW-LS & 1873 & 1887 & 1880 & 1880 & 0.215 \\ \hline MW-HS & 1178 & 1233 & 1231 & 1211 & 0.140 \\ \hline MW-MS & 1  
shown for wind, solar, and the combined generation of both in the nine locations analyzed in this study. For wind generation (Figure 9a), locations with low wind resources experience generation values close to the 20% threshold for almost the entire year. While these values decrease significantly for the 10% and 5% thresholds, they remain extremely high, highlighting the clear unsuitability of wind exploitation in these areas. In locations with moderate and especially high wind resources, the hours of generation below these thresholds are much lower. For regions with moderate wind resources, the 20% threshold corresponds to approximately 50% of the hours in a year, the 10% threshold to around 2000 h, and the 5% threshold to about 500 h. In high-wind areas, these values are approximately 1000, 100, and almost negligible for the 20%, 10%, and 5% thresholds, respectively. In the case of solar generation (Figure 9b), the differences between regions are much less pronounced (the figure also includes nighttime hours in considering the generation thresholds). Across all locations, the number of hours below the 20% generation threshold ranges from approximately 7000 to 5500 for regions with high, moderate, and low irradiation. When the threshold is reduced to 10%, these figures increase to between 6000 and 5000 h. Further lowering the threshold to 5% results in values between 5500 and 4500 h. These findings suggest that photovoltaic solar generation is generally suitable for exploitation in nearly any location. Figure 9: Yearly hours below generation threshold values of 5, 10, and 20% of peak power for the studied resources: (**a**) wind; (**b**) sun; (**c**) both contributions. The combined generation of wind and solar (Figure 9c) exhibits intermediate behavior but leans more toward the characteristics of wind generation. Since solar generation tends to be relatively consistent across locations and does not exhibit significant performance differences like wind, it is the wind generation that primarily determines whether the thresholds are exceeded.