  Despite its critical importance, the famous X-model elaborated by Ziel and
Steinert (2016) has neither bin been widely studied nor further developed. And
yet, the possibilities to improve the model are as numerous as the fields it
can be applied to. The present paper takes advantage of a technique proposed by
Coulon et al. (2014) to enhance the X-model. Instead of using the wholesale
supply and demand curves as inputs for the model, we rely on the transformed
versions of these curves with a perfectly inelastic demand. As a result,
computational requirements of our X-model reduce and its forecasting power
increases substantially. Moreover, our X-model becomes more robust towards
outliers present in the initial auction curves data.
