LCOE is vastly lower for battery backed solar, that’s why it’s so cheap. You also don’t need backup with batteries that’s the entire point.
Individual nuclear power plants are single points of failure and go offline randomly. Nuclear needs redundancy to ensure a stable grid which further increases its costs.
Transmission is again worse for nuclear because it’s so centralized. With solar you can locate it much closer to end users which cuts down on annual transmission losses.
Seattle is an extremely unusual location being both far north and very rainy. But that much rain provides plenty of hydropower which completely changes the equation.
