I'm dealing with the calibration of the forward curve for energy products. I found an approach proposed by Benth et al., in which the forward curve is parameterized as $f(t) = s(t) + \epsilon(t)$ where $s$ is the seasonality and $\epsilon$ is a smooth curve used to quantify the deviation from the seasonality. In the paper, $s$ has been chosen according to Lucia and Schwartz.
My questions are:
- Which alternatives to Benth et al. are used?
- Do exist other models other than Lucia and Schwartz for the deterministic function $s$ useful in this setting?