The marginal cost of average power is very low. At least for solar in the south (air conditioning), the marginal cost of peak daytime power is much less so. Re

The marginal cost of average power is very low. At least for solar in the south (air conditioning), the marginal cost of peak daytime power is much less so. Remember that capacity is sized for peak utilization: the gap between average load and peak is load is extremely expensive, as it's by definition low-utilization compared to base load generation.