Storm Barney hit Ireland's shores last week bringing strong winds, the fuel for our wind farm fleet. But a noticeable thing happened. Between 1pm and 6pm, wind energy output dropped by as much as 44% :
Let's have a look at wind speeds during the day. As you can see below, the highest wind speeds occurred during 12 and 6pm, the period when wind energy output began declining. Wind speeds reached between 30 and 50 knots, or 15 and 25 metres per second. Air pressure went as low as 980 hpa. Not as low as The Night of the Big Wind in 1839 where it went down to 920hpa or the hurricane in 1988 where it went down to 950hpa.