I have had a functional integration between Tibber and OpenHAB for a long time, utilizing https://pypi.org/project/pyTibber/ together with https://pypi.org/project/python-openhab/
It is too messy and intertwined with other stuff to be shared, but I could perhaps come up with some simple examples. It has been quite a while since I did anything in Java, so a native OpenHAB binding is not as easy as such a mock-up in Python.