The lack of wind in the UK this year has already been in the news resulting in poor performance of UK wind farms. UK wind now has 11.2 GW  of installed capacity amounting to 13.5% of total generating capacity in the UK. In September the wind park generated 739 GWh amounting to 3.3% of UK demand . The load factor was only 9%.
Figure 1 The renewables revolution in the UK was barely visible in September 2014 as the UK imported twice as much electricity from the continent as was generated by the 11.2 GW of installed wind capacity. If it were not for a little bit of wind towards the end of the month, wind generation would have been close to zero. Click on chart for a very large version.
The generating data are summarised in Figure 2.
[Note added 4th October: It has emerged in comments that the wind metered by BM reports / Gridwatch may be a sub-set of installed capacity as reported by Renewable UK. This may result in an error of my calculation of wind load factor that may actually have been as high as 12% in September. Being able to access reliable and up to date statistics is an on-going problem.]
Figure 2 UK generating statistics for September 2014 from Gridwatch. Plant capacity figures from DECC  apart from wind where recent capacity figures are taken from Renewables UK  and inter connector capacity from Ofgem .
Nuclear also had a bad month with a load factor of 63% owing to a couple of power stations going off line for unscheduled maintenance to boilers that are on the non-radioactive end of the generating plant. 63% is poor performance, but still 7* better than wind.
So why has the weather been so calm and why were we not warned? Is this yet another freak event to be explained by CO2 and global warming? Well we were in fact warned, not by the Met Office but by Clive Best who on August 10th produced his Supermoon Weather Forecast  saying:
There will be unsettled weather in northern Europe until the second half of August. This will be followed by an extended period of warm calm weather for about one month. UK will then have a pleasant Indian Summer. There will be a week of changeable stormy weather around the 5th September to spoil the otherwise pleasant weather.
Watching Clive’s simulation is worthwhile especially for the cool country music soundtrack.
Roy Spencer has also been keeping his eye on global wind statistics noting :
Global average ocean surface wind speeds have been decreasing. In fact, August 2014 had the lowest surface wind speed in about 25 years.
So much for the wind always blowing somewhere. Roy also brings our attention to this chart from Weatherstreet  which I believe speaks for itself.
The great tragedy of Science — the slaying of a beautiful hypothesis by an ugly fact. Thomas Huxley 1870
Reports that say that something hasn’t happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns — the ones we don’t know we don’t know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones. Donald Rumsfeld 2002
It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so. Attributed to Mark Twain
 UK wind capacity data from Renewable UK
 UK generating data from Gridwatch
 UK power station capacities from DECC DUKES 5.10
 UK inter connectors Ofgem
 Clive Best Supermoon weather forecast
 Roy Spencer Are Record Ocean Surface Temperatures Due to Record Low Wind Speeds?