"Utilisability" vs. "usability"

I tried hard to find if we have the noun utilisability in dictionaries but it does not exist. But, when goolging, I found some articles that contain this word.

I know that we have the verb to use and the corresponding noun is usability. I am just wondering if utilisability exists.

utilizable
capable of being put to a profitable or practical use

It turns out that the term utilisability/ utilizability has been adopted by literature in solar energy for a specific technical meaning. Most probably, owing to a first reference 'Utilisibility Method' by its proponent sometime earlier. Moreover, the original coinage could have been by a non-native speaker (or even a native speaker) who wanted, naturally, a new term to distinguish from the generic 'usability'.