How are renewables more competitive with fossil fuel than nuclear when it comes to storage and transmission? At least nuclear can keep producing when the sun is

How are renewables more competitive with fossil fuel than nuclear when it comes to storage and transmission? At least nuclear can keep producing when the sun is down and the wind isn't blowing. It's also more energy dense, so it can scale to cover demand. We're not decarbonizing the economy without those factors being accounted for.