Hi Tobi, I was researching on this as part of my PhD, we managed to publish a scientific paper out of it but I didn’t continue on this line of research. This said, I have a couple of links that you might find useful:
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The scientific paper: Energies | Free Full-Text | Baseline Energy Use Modeling and Characterization in Tertiary Buildings Using an Interpretable Bayesian Linear Regression Methodology
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The Github repo with the code I used for the paper: GitHub - bgrillone/Bayesian-Measurement-and-Verification
The Github repo is not well documented and was meant for my personal use only, but maybe you can have a look and figure out if it can help you with your project as well.
Good luck!