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EARLIER THIS MONTH, the Minister for Energy Pat Rabbitte revealed that wind energy contributed more energy than ever to the national grid one windy evening last December.
1866 megawatts, 42 per cent of our total electricity needs at the time, was generated and fed into the grid, according to the Minister. Furthermore, the Irish Wind Energy Association (IWEA) has predicted that 18 per cent of demand last year was met by wind energy.
But what do the other figures on wind energy reveal? TheJournal.ie got our the pencils and spreadsheets out and crunched some numbers…
Firstly, how much is a megawatt?
A megawatt (MW) is the main unit of measurement. At any one time in Ireland, roughly 3500MW is required to power our homes, businesses, hospitals, and everything else. This dips at night and generally reaches its peak in the evening.
It’s generally said that 1MW can power between 750 and 1000 homes.
Year-on-year
All data is available online for wind energy production is available in precise detail. The figures below are based on either wind energy generation, wind energy generation forecast, or system demand calculated every 15 minutes and available from EirGrid.
This concerns electricity contributed to the grid, rather than the total amount of power produced by the wind turbines.
The graph below shows, unadjusted, how much wind energy was pumped into the national grid. The result is a little chaotic, as wind energy can vary between 0MW to more than 1500MW on any given day.
The information is provided, as stated, in 15 minute intervals, leading to over 35000 individual units of data.
Click here to view a larger version.
It starts to make a little bit more sense with a smoothed graph.
When an average of the megawatts contributed to the grid is calculated per every half-month, it reveals a trend loosely matched each year-on-year, but average contribution to the grid dipping as low as 200MW.
It peaks at 750MW late last year, potentially due to the weather we were experiencing.
Click here to view a larger version.
Forecasting demand
EirGird’s data also lists a forecast of how much wind energy is expected to be produced.
Over the past five years (31 December 2008 to 31 December 2013), the amount of power contributed to the grid by wind turbines missed this forecast 58 per cent of the time.
The figure was surpassed 41 per cent of the time, and in the remaining 1 per cent the demand was either met or data was unavailable.
Click here to view a larger version.
New farms and rising capacity
Between 2011 and 2013, 49 new wind farms were built, according to the IWEA.
Minister Rabbitte recently announced these are made up of 1,386 wind turbines.
The total capacity of these wind farms, or the total amount of electricity these farms have the potential to contribute, has now reached 2011 MW.
Adding up to this 2011Mw figure over recent years were 18 wind farms built last year adding 289MW, eight wind farms adding 120.49MW in 2012, and 23 adding 199.15MW the year previous.
It is extremely unlikely that our wind farms would be able to produce 2011MW. Wind turbines generally operate much lower than their stated capacity. This is revealed in the graph below.
The increase is in capacity is most noticeable in the peak output, the single highest measurement recorded each year, but less so in the average output, calculated at 486MW in 2011, dipping to 467MW in 2012 before rising to 529MW in 2013 according to EirGrid quarter-hourly figures.
Click here to view a larger version.
Meeting demand
The graph below has taken each 15-minute interval in 2013, amounting to around 35,000 individual units, and calculated how much of the total demand for electricity on the national grid was being met by wind energy at that time.
For example, less than one per cent of demand was met during 250 of these units, while during 1600 of these units 3 per cent of demand was being produced.
Click here to view a larger version.
Aata above was either provided during Dáil debates or by the IWEA, but the vast majority can found on EirGrid.ie. An iPhone app is also available, and shows energy-related data in Ireland and Northern Ireland.
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If the trial was here he’d have got a suspended sentence
You’d wonder why these people chose a life of crime when you are so likely to end up dead or in prison
@Tweety McTweeter: Greed.
@Tweety McTweeter: I blame Fine Gael
@Tweety McTweeter: that’s so true they should have chosen to be a banker or politician, it’s so much easier to live and get away with ripping people off. But outside of that it’s a good day for the Garda in dealing with these criminals
@Tweety McTweeter: I find the violence as abhorrent as the next, but if you followed this case you’d likely agree this conviction is unsafe. The prosecution changed stance at the last minute from saying he did the killing to he might have been the getaway driver.
@Tweety McTweeter: And Prison in Spain is a different story than our soft regime. They will wake up in the mornings with a big sweaty hairy Moroccan cell mate whispering sweet nothings in their ears !
I see the Predator cleaned himself up and got a new job.
@Seaghán Corcoran: ha ha cracker seaghan
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