Thank you, I am happy you like the mod :-).
I think it's an interesting and novel idea, co-producing electricity and heat from the same renewable source.
Realistically speaking though, producing steam efficiently isn't really possible without large parabolic troughs or mirrors + concentrating towers that can overcome increasing heat loss. My mod's thermal panels, that visually appear rather flat, are already pushing reasonable limits. But even ignoring that, trying to produce electricity as well would be at least doubly counter-productive, since solar cells are inefficient (or outright break) at high temperatures, and they would take away potential heat energy, quickly reducing steam production or halting it altogether.
More importantly, I really just like the aesthetics and practicality of not having to hook up every panel to the electric grid + battery storage. It is one of the major reasons I had for creating this mod fork in the first place.
In any case, thanks for your input! I like exploring ways to make power production more interesting as well.
I will see if I can update my mod soon.