For this dataset a normal distribution has been assumed, a typical practice in the natural sciences concerning random variables with uncharacterized distributions. The normal distribution of a range of values is typified by the bell curve, where the mean value is the highest probability result. 68% of values in this range lie within a single
standard deviation away from the mean with 95% and 99% lying within two and three standard deviations respectively.An illustration of the P90 value can be seen on Figure 2. Here the shaded area indicates the 90% cumulative probability of any given year having a GHI value greater than the P90 value. In this plot the probability density curve follows a normal distribution and indicates the specific probability of any given year having a specific GHI value.Financial analysis was then performed assuming the P1 to P99 GHI levels w system in order to compare the LCOE and IRR under the sensitivity
analysis. In doing so, it was possible to derive a sense of the risk in investing in a photov for GHI fluctuations.