Would be great if you could introduce a new feature. Just a button that activates a more random solar panel output like in real life. Not all the days the sun shines the same!!
I read you don't have plans to introduce new features but I just wanted to leave here my idea in case you change your mind.

Hey Gato! I am looking into it. Although, maybe what you are actually looking for is something like a weather mod?

Hi again

I've looked into it, and I am afraid I can't actually do it except in ways which are problematic. I would have to regularly modify the solar surface multiplier (which seems like a bad idea for various reasons), or I would have to apply a script to every single panel, which would likely have a significant performance impact on very large factories. And then there are the details of mod compatibility.

In short, I don't know of any good solution right now. And I am not a programmer, so I can't/won't make anything too complicated either. I'll have to see.

Anyway, what are the specific challenges you are seeking through random variation in power supply? I know it's more realistic, but how do you imagine it would change your play style or factory design? I ask, since there is already variation in solar power and a lot of potential randomness in power consumption, which encourage the use of back-up power and power decoupling for prioritizing critical infrastructure etc. What do you think would change the most? I am curious about your opinion.

woow first of all thanks for your answere.
Nice didnt know about this one. Could be what I'm asking for.
Because of this: "Cloudy - Reduced light reaching the surface, dimmer screen and temporary less solar power."
Im gonna give it a try.

My request comes from the need fo having more inmersion in the game. I want to feel navious is more alive. I know this is really subjevtive.
But wether simulation will be nice addition to it.
Thanks again.

That's great! And you're welcome. I have studied the code of that mod to see if I could maybe imitate a small part of its function, but it's hard for me to understand it. But it seems very well written, and I also tested it a bit, and it seems to still work on the newest version of Factorio. Good luck with trying it out!