Jevons paradox is often claimed, but largely irrelevant in this case, imo. If the demand rises, the price rises again, as well. It doesn't force anybody to keep using fossil energy

Price elasticity definitely is a thing, but I'd argue not in the way you see it.

Have a somewhat competitive energy market and falling production prices like we have for carbon neutral energy. What do you think will happen? The market will gobble up any and all production.

Look at what we currently have even with largely fossil energy. The substantial US/EU delta in energy price and energy consumption. Notice how similar the deltas are?