A quick story from the BBC news site pointing out that wind turbines aren't generating as much energy as originally planned. Only attaining a third of the planned capacity sounds pretty rubbish.
However, the stats that they're looking at are slightly misleading. The story is reporting that they are only generating 30% of their 'capacity'.
The capacity is measured by the amount of energy that the wind farm would produce if they turned at full power 100% of the time. To be fair to the builders, reaching 30% of this number is extremely good going. If wind farms are being built the on assumption that they could get much higher than this, then that is slightly worrying.