The economic viability of a proposed plant is inﬂuenced by several factors that contribute to its proﬁtability. The plant proposal is generally initiated with some expected values of the contributing factors. As the expected proﬁtability would vary with deviations in these factors, the sensitivity of proﬁtability to such variances around their expected values is analyzed. Such a sensitivity analysis determines the range of proﬁtability and raises the conﬁdence level of potential investors. This is important for both wind and photovoltaic (PV) systems but more so for wind systems, in which proﬁtability is extremely sensitive to wind speed variations.