There is quite a variation between the simulation and the actual results, and we are doing much better in the summer, and were doing a little worse in the winter, so the overall the simulation seems pessimistic. Of course this year's weather may have been exceptional, and the differences could be accounted for by that. We'll need a few years' data before we can really know how accurate the simulation was.
To get an idea of why August was so good, you can see from this chart that there were just very few days with low generation. Also there was relatively little limitation of the power output, in fact the least since records began. Less than two hours over the whole month, compared with almost twenty hours in May.
