Solar output
Total demand
Net demand (grid)
Net demand + battery
Curtailed (wasted)
Steep evening ramp
As a grid adds more solar capacity, midday net demand — total demand minus solar output — sinks toward zero or below, forcing operators to curtail excess solar with nowhere useful to go, while the same growing solar capacity means output collapses almost to nothing right as the evening peak is rising, creating an increasingly steep ramp that conventional generators must match in just a few hours. Slide installed solar capacity to watch the curve sink into the "duck" shape, then toggle battery storage to see how storing midday excess and discharging it in the evening flattens both the curtailment and the ramp.