First Year Mismatch Degradation Factor

[Sed Mir]

Why first year mismatch degrad. factor is not zero? Why it has a negative -0.01% value? 

[Michele Oliosi]

Hi @Sed Mir, thanks for reporting this issue.

It turns out this happens because of a small interpolation error, which we had not noticed before. Usually the interval year 0 - year 5 has a smaller differential than year 5 - year 10. As a consequence, since we use cubic splines, there is oftentimes a small dip in the interpolation curve just after the first interpolation node (after year 0). Because the first operational year's loss is evaluated at 0.5 year, this happens to be within the dip, and turns out negative (though very small).