# Potential of Photovoltaic Generation in the Putumayo Department of Colombia
## 3 Results
### Calculation and Analysis of Solar Radiation Data for Different Regions and Stations

Table 3: Comparison of irradiation values \(G_{da}\) from IDEAM weather stations and NREL remote sensor data. With the previous monthly and annual irradiation data from IDEAM, NREL, and NASA, the daily interannual averages of irradiation were obtained for each region of Putumayo. As can be seen in Figure 7, the results from IDEAM and NREL have the same tendency of higher irradiation in the Amazon region to lower irradiation in the Andean region; this behavior is given by the natural changes of the regions. The Andean region has a mountain range with heights of 2800 m, which has its base in the Andean-Amazon region at altitudes of 500 m and continues with a plain that extends towards the Amazon at altitudes of 140 m above sea level. On the other hand, it can be observed that the results of the NASA data do not have the same behavior as the other two database results, which is because the NASA data have a resolution of 55 km by 55 km and cover areas that have different geographical and climatic conditions. To support the previous regional analysis, statistical comparisons were made between the results of data taken from IDEAM's meteorological stations and those from NASA and NREL remote sensors. As it can be seen in Table 5, the irradiation data of the Andean region presents t, MBE, MPE, and RMSE statistics higher than the other regions, which represents a bad adjustment and high error of the data. In contrast, the Amazon region presents statistics with lower values than the other regions, indicating that these data have less error and better adjustment between compared data. It can be observed that the NASA data have higher comparison statistics than the NREL data, therefore the NREL data fit better \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Region**} & \multirow{2}{*}{**Station Area**} & **IDEAM \(G_{da}(0)\)** & **NASA \(G_{da}(0)\)** & **MBE** & \multirow{2}{*}{**MPE \%**} & **RMSE** & **Statistic t** \\  & & **(kWh/m\({}^{2}\)day)** & **(kWh/m\({}^{2}\)day)** & **(kWh/m\({}^{2}\)day)** & **(kWh/m\({}^{2}\)day)** & **(kWh/m\({}^{2}\)day)** \\ \hline \multirow{4}{*}{Amazon} & Leguizamo & 4.44 & 4.46 & 0.02 & \(-\)0.65 & 0.11 & 0.69 \\  & Tagua & 4.34 & 4.46 & 0.12 & \(-\)3.20 & 0.20 & 2.50 \\  & Tres-equina & 4.44 & 4.33 & \(-\)0.10 & 2.20 & 0.14 & 3.99 \\  & Valparaiso & 4.41 & 3.94 & \(-\)0.46 & 10.10 & 0.52 & 6.57 \\  & Umbria & 4.13 & 3.76 & \(-\)0.37 & 8.59 & 0.41 & 6.58 \\ \hline \multirow{2}{*}{\
\begin{tabular}{c} Andean- \\ Amazon \\ \end{tabular} } & Villagarzon & 3.64 & 4.37 & 0.73 & \(-\)21.62 & 0.83 & 6.19 \\  & Mocoa & 3.71 & 4.37 & 0.66 & \(-\)18.90 & 0.74 & 6.46 \\ \hline \multirow{2}{*}{
\begin{tabular}{c} Andean \\ El encano \\ \end{tabular} } & Primavera & 2.71 & 4.37 & 1.66 & \(-\)65.39 & 1.71 & 12.34 \\  & Michoacán & 2.48 & 4.37 & 1.89 & \(-\)85.31 & 1.96 & 11.46 \\  & El encano & 2.33 & 4.12 & 1.79 & \(-\)81.90 & 1.86 & 12.69 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Comparison of irradiation values \(G_{da}\) from IDEAM weather stations and NASA remote sensor data. Figure 7: Annual daily average of radiation \(G_{da}(0)\) for the IDEAM station areas using different databases. and with less error than the IDEAM data. As explained above, these errors are because the Andean region has a variety of microclimates due to the thermal floors of the mountain ranges and to the high extension covered by the database.