Explanations as to why this cost differs from others
The out-lying nature of this cost was noticed shortly before going to press and is an issue which needs to be addressed. The problem arose due to the difficulty of mapping MARKAL 3.26 costs to the Calculator. The former operates a series of tranches with costs differing between them, while the calculator does not.
Model estimates are less reliable than real life empirical evidence, so we have disregarded this data point.