Reply #24: An excellent point

[Nederland]

Your are correct that demand varies and the existing grid deals with that variability by having excess capacity (or what is called spinning reserves) on line to compensate for that variability. However, I think you exagerate the degree to which demand fluctuates. At any given point in time demand is going to be within 5% of predicted values. But your point is well taken--it is not necessary for predictions of renewable output to be exactly accurate in order for a 100% renewable sourced grid to work properly. So I'll be extremely generous and say that if you can be right within 20%, I'll concede the point. Just tell us what the power output of all the wind farms in Germany will be for the rest of the month and we will see if you can get within 20%. Thanks.