I study chemistry, I told you for sure... Nuclear is a harmful process towards the environment, nuclear reactors byproducts are extremely difficult to get rid off and they're currently just being dumped on the ocean...

I can see that you're thinking in solar panels placed on Earth surface, that's why you say it's somehow inestable source of energy. But actually it's quite the opposite, there's no more stable and reliable source of energy that solar radiation. What you think about it being a raw technology with no solid concepts yet available for practical us very true tho, but the speed of development is proportional to the budget of the research, and solar energy don't get what it needs to be a reasonable alternative for our society.