In December 2012 the Renewable Energy Foundation published a study by Dr. Gordon Hughes [backup link] that detailed the degradation of capacity factors in Denmark and the UK over time. As it happens, I’ve been posting on this issue ever since John Harrison first brought it to my attention over a year ago. John and I and others have run our own numbers, obtaining results that are fairly consistent with Hughes’ results. First I’ll summarize his report and then discuss the similarities. continue reading…