Tuned hyperparameters as well, this was after tuning. One of the many issues with prophet is lack of AR terms that are critical, in energy such terms will be critical.

I am currently testing neural prophet and have written about Part I results using electircity consumption data. There will be more articles on neural prophet as it also includes prophet functionality but it is already clear without AR terms prophect itself not useful.

https://valeman.medium.com/benchmarking-neural-prophet-part-i-neural-prophet-vs-prophet-252990763468