Both. They do different things. Nuclear provides non-carbon-emitting base load for situations where we don't have enough batteries to ride out dunkelflaute[0]

Both. They do different things. Nuclear provides non-carbon-emitting base load for situations where we don't have enough batteries to ride out dunkelflaute[0] and we haven't hit peak uranium yet. Biomass carbon sequestration buries carbon that we liberated into the air back into the ground. In order to deal with the problems we caused, we both need to stop causing the problem and fix the damage we did. [0] German word for "dark wind lull", i.e. no sun and the wind ain't blowing.