Hi Snowdoe, thank you for your kind words, I really appreciate it!
I am not sure about variants with trade-offs right now, but I have definitely thought a lot about more complex setups for even more renewable/inexhaustible energy produced pr. area. Not on a scale that can compete with SE, though!
Something I am considering is using energy-dense fuels for achieving even higher temperatures. I could add an oil-fired superheater, which heats 165°C steam to even greater temperature (maybe even add an efficiency bonus), in order to better utilize the capacity of Steam Turbines. This way, you would couple two inexhaustible energy resources (sunlight and oil) together to produce at least the same amount of energy; more complex and, uh, potentially within less space. I can already do this with the mod Superheating (Balanced), but I would want to refine the code, balance it and add it to my own mod. I might also want to add a way of producing biofuel or biocoal from wood and a way to grow trees, plus a (bio)coal-fired superheater. You could then also harness energy from a forested area, which is its own form of efficiency, since the trees combat pollution and also look nice.
But there are many details to consider - like the desired scope of the mod and how much difference the additions even make in the end - and I am not a programmer, so I don't know if I will be able to create something I am happy with. We'll have to see.
By the way, Cheese's Concentrated Solar might be an interesting "next tier" power option to consider. It looks pretty cool (if a bit overwhelming) and the power output can be configured as well.