I just think:
how many living species have been on earth? Millions probably
How many of those species are intelligent? 1
How long have this intelligent species been around? Nothing at a cosmic timescale.
How many of this intelligent species have become “interstellar”? 0
I don’t think those numbers can be extrapolate, even to the observable universe, to ensure that there are any species capable of interestellar travel around. Living species and even intelligent ones? Maybe. But a long lasting inteligent and interestellar species? We are not an example of that, so we have 0 examples to extrapolate. Only our wishful thinking that humanity will last longer and keep progressing, but that is just a hope, not real yet.
In Spain we are starting to get negative prices every weekend for electricity thanks to renewables. France is not even close to those prices with their bet for nuclear.
Don’t get me wrong, I love nuclear power. And I’m not a big fan ok what thousands of windmills made to our landscapes. But efficiency wise renewable is unbeatable nowadays.