Wind power in the Republic of Ireland

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Wind turbines on Leitrims Corrie Mountain

As of December 2014 Ireland has an installed wind power capacity of 2,111 megawatts.[1] In 2014 this provided 19% of Ireland's electricity needs, one of the highest rates of wind energy penetration in the world.[2] The wind energy sector continues to grow strongly in Ireland, with several hundred megawatts of capacity added to the system each year. Ireland's wind farms are currently almost exclusively onshore, with only the 25MW Arklow Bank Wind Park situated offshore

Previous milestones[edit]

External images
Today's prognosis and production

By 20 August 2013, Ireland had an installed capacity of 2,232 megawatts.[2] The 2013 figure shows an increase of 232 megawatts compared to the figures reported on 24 March 2012. Depending on weather conditions the power was enough to supply 1.3 million homes in 2012.[3]

On 31 July 2009, the output from the country's turbines peaked at 999 megawatts. At that time, 39% of Ireland’s demand for electricity was met from wind.[4] On 24 October 2009, the output exceeded 1000 megawatts for the first time with a peak of 1064 MW. Once in April 2010, 50% of electricity demand was met from wind power.[5] However, the wind generation capacity factor for 2010 was approx. 23.5%, giving an annual average wind energy penetration of approx. 11% of total kWh consumed.[6][7]

On 19 July 2010 the Irish Wind Energy Association reported an installed capacity of 1746 megawatts, enough to power 753,000 households. 2012 capacity is more than four times the total of 495.2 megawatts in 2005. In 2008 alone, the rate of growth was 54.6%, amongst the highest in the world.[8] Average 2013 output to 21/09/2013 is 486 Megawatts and Median 2013 Output is 393 Megawatts. Output can be as low as 3 Megawatts on a still day such as 12 July 2013 when a low of 3 Megawatts was reached at 9:30 am[9][not in citation given] which is 0.012% of the Rated Installed Capacity of over 2,200 Megawatts.

As of July 2012, up to 14.8% of Irish electricity has been generated from renewable sources, up from 5% in 1990. Wind is the main source of renewable energy production, increasing from less than 1pc of total renewable production in 1995 to over 40pc today.[10]

On 17 December 2013, the output from the country's turbines peaked reaching 1769 megawatts, a new record.[11]

Background[edit]

Wind turbines on Inishmaan

In the Directive[12] 2001/77/EC, otherwise known as the RES-E Directive, the European Union stated a goal to have 22% of the total energy consumed by member states to be produced from renewable energy resources by 2010. As a result, Ireland, in a report titled "Policy Consideration for Renewable Electricity to 2010", made the commitment to have 4% of its total energy consumption come from renewable energy resources by 2002 and 13.2% by 2010. The Department of Communications Marine and Natural Resources (DCMNR) founded the Renewable Energy Group (REG) which established the short term analysis group (STAG) to investigate a means of accomplishing this goal. To meet the 2010 target of 13.2%, 1,432 MW of electricity will need to be generated from renewable resources with 1,100 MW being generated from wind resources both onshore and offshore.

Offshore wind power[edit]

Main article: Offshore wind power

The Arklow Bank Wind Park, located 10 km off the coast of Arklow on the Arklow Bank in the Irish Sea, was Ireland's first offshore wind farm. The wind farm is owned and built by GE Energy and was co-developed by Airtricity and GE Energy. The site has 7 GE Energy 3.6 MW turbines that generate a total of 25 MW. The development of the site was originally divided into two phases with the first phase being the current installation of 7 turbines. The second phase was a partnership between Airtricity and Acciona Energy. Acciona Energy had an option to buy the project after the facility is completed. The wind farm was planned to expand to 520 MW of power. However, in 2007, Phase 2 was cancelled.[13]

Although the waters off the Atlantic coastline of Ireland are a better site for wind farms because of the available wind resources, sites along the eastern coastline such as Arklow were chosen because of the shallower waters, which are 20 m deep or less.

The National Offshore Wind Association of Ireland (NOW Ireland) announced in April 2010 that 60,000 potential jobs could be created in the Irish marine, construction, engineering and service industries through the development of offshore wind energy in Irish and European waters. NOW Ireland also announced in the same month that over €50bn was due to be invested in the Irish Sea and Celtic Sea in the next two decades.[14]

In Belfast, the harbour industry is being redeveloped as a hub for offshore windfarm construction, at a cost of about £50m. The work will create 150 jobs in construction, as well as requiring about 1m tonnes of stone from local quarries, which will create hundreds more jobs. "It is the first dedicated harbour upgrade for offshore wind".[15]

Current trends[edit]

Grid connection is currently awarded on a 'first come, first connect' basis through Gate 3 procedures. On examination of the Gate 3 queue, there are a number of large onshore and offshore wind projects that are down the list and will, therefore, be offered grid connection towards the end of the anticipated 18-month processing period commencing in December 2009.[16]

While planning permission normally expires after 5 years, the Planning and Development Act 2000 section 41 allows for a longer period. At present it is common to apply and obtain a 10 year permission for a wind energy development. Section 42 of the above Act originally permitted a 5 year extension of the "appropriate period" provided that substantial works were carried out. This caused major problems as the term "substantial works" was not clearly defined which resulted in a large variety in interpretation of what constituted substantial works among the various planning authorities. This issue was rectified by the Planning and Development (Amendment) Act 2010 section 28 which inserted an additional paragraph allowing a once off extension not exceeding 5 years if "there were considerations of a commercial, economic or technical nature beyond the control of the applicant which substantially militated against either the commencement of development or the carrying out of substantial works pursuant to the planning permission"


The fourth issue regarding the generation of wind power is the Renewable Energy Feed-in Tariff, or REFIT. The purpose of REFIT is to encourage development of renewable energy resources. For wind power production, the current limit to the tariff is 1,450 MW. However, applications currently being processed for grid connections exceed the limit by almost 1,500 MW for a total for nearly 3,000 MW. Since the limit is 1,450 MW, many of the applications for grid connections may not eligible for the tariff.[17]

5 largest onshore wind farms[edit]

Wind Farm Completed Capacity (MW) Turbines Turbine Vendor Model Size (MW) County Coordinates Operator
Knockacummer 2014 87.5 35 Nordex N90 2500 2.5 Cork Brookfield
Mount Lucas 2014 84 28 Siemens SWT-3-0-101 3 Offaly
Meentycat[18] 2005 72 38 Siemens 2.3 Donegal SSE Renewables[19]
Derrybrien[20] 2006 60 70 Vestas V52 0.85 Galway ESBI[21]
Boggeragh 2009 57 19 Vestas V90 3 Cork
Lisheen[22] 2009 54 18 Vestas V90 3 Tipperary SWS[23]

Environmental Impact & Greenhouse gases[edit]

The Vattenfall utility company study found Hydroelectric, nuclear stations and wind turbines to have far less greenhouse emissions than other sources represented. These studies on the total life cycle greenhouse emissions per unit of energy generated take into account cradle-to-grave construction emissions etc. These results are in-line with those made in 2014 by the Intergovernmental Panel on Climate Change.[24]

In a typical study of a wind farms Life cycle assessment(LCA), in isolation, it usually results in similar findings as the following 2006 analysis of 3 installations in the US Midwest, were the carbon dioxide(co2) emissions of wind power ranged from 14 to 33 tonnes (15 to 36 short tons) per GWh(14 - 33 gCO2/kWh) of energy produced, and most of the CO2 emission came from producing the concrete for wind-turbine foundations.[25]

However when approached from the effects on the grid as a whole, that assess wind turbines' ability to reduce a countries total electric grid emission intensity, a study by the Irish national grid, a grid that is predominately (~80%) powered by fossil gas, and if it was 100% gas, would result in emissions of 410 - 650 gCO2/kWh.[26][27] Found that "Producing electricity from wind reduces the consumption of fossil fuels and therefore leads to [electric grid] emissions savings", with findings in reductions of the the grid-wide CO2 emissions to 0.33–0.59 tonnes (0.36–0.65 short tons) of CO2 per MWh(330 - 590 gCO2/kWh).[28]

These findings, although a positive development, were not as large a reduction as one would initially expect from analyzing wind farms LCAs in isolation. As High electric grid penetration by Intermittent power sources e.g. wind power, sources which have low capacity factors due to the weather, either requires the construction of energy storage projects, which have their own emission intensity which must be added to wind power's system-wide pollution effects, or it requires more frequent reliance on fossil fuels than the spinning reserve requirements necessary to back up more dependable/baseload power sources, such as hydropower and nuclear energy.

This higher dependence on back-up/Load following power plants to ensure a steady power grid output has the knock on effect of more frequent inefficient(in CO2e g/kWh) throttling up and down of these other power sources in the grid to facilitate the intermittent power source's variable output. When one includes the intermittent sources total effect it has on other power sources in the grid system, that is, including these inefficient start up emissions of backup power sources to cater for wind energy, into wind energy's total system wide life cycle, this results in a higher real-world wind energy emission intensity than the direct g/kWh value that is determined from looking at the power source in isolation and thus ignores all down-stream detrimental/inefficiency effects it has on the grid. In a 2012 paper that appeared in the Journal of Industrial Ecology it states.[29]

"The thermal efficiency of fossil-based power plants is reduced when operated at fluctuating and suboptimal loads to supplement wind power, which may degrade, to a certain extent, the GHG(Greenhouse gas) benefits resulting from the addition of wind to the grid. A study conducted by Pehnt and colleagues (2008) reports that a moderate level of [grid] wind penetration (12%) would result in efficiency penalties of 3% to 8%, depending on the type of conventional power plant considered. Gross and colleagues (2006) report similar results, with efficiency penalties ranging from nearly 0% to 7% for up to 20% [of grid] wind penetration. Pehnt and colleagues (2008) conclude that the results of adding offshore wind power in Germany on the background power systems maintaining a level supply to the grid and providing enough reserve capacity amount to adding between 20 and 80 g CO2-eq/kWh to the life cycle GHG emissions profile of wind power."'

According to the IPCC, wind turbines when assessed in isolation, have a median life cycle emission value of between 12 and 11 (gCO2eq/kWh). While the more dependable alpine Hydropower and nuclear stations have median total life cycle emission values of 24 and 12 g CO2-eq/kWh respectively.[26][30]

Peat CO2 impacts & wildlife deaths[edit]

On the 16th of October 2003 at Derrybrien County Galway, at the site of what would become Ireland's largest wind farm in 2006, the 70 tower Derrybrien project resulted in the distruption of the underlying peatland and culminated in an almost 2.5 km long, 450,000 cubic meter peat slide, akin to a roaring[31] "avalanche". While initially coming to rest 2.5 km away, and then with rain, entrance into the "Derrywee River" or Abhainn Da Loilioch,[32] it eventually spilled 20 km away into "lough Cotra".[33] While the lake was also the source of the townland of Gort's drinking water, and this caused distruptions to supply,[34] an impact assessment on the wildlife within the lake determined that more than 50 per cent of fish in the lake had been killed due to this unprecedented pollution, about 50,000 fish of all ages and species groups had perished. A smaller peat slide had occurred prior to the main movement on the 16th but it did not result in the suspension of the construction of the wind turbine farm.[35]

Construction of turbines and access roads on top of peatlands results in the drainage and then eventual oxidation of the peat knocking out any "green credentials" of wind turbines situation near them. As biochemist Mike Hall states, many wind farms may eventually emit more carbon than an equivalent coal-fired power station.[36]

In the report on the peat slide it states: "The rationale for wind farms is that they reduce CO2 emissions compared to fossil fuels. In most places, emissions from wind farms are associated only with the construction of the components and vehicular emissions linked to the site’s development and maintenance. However, on peatlands, construction results in significant ongoing CO2 release because they are substantial long-term carbon stores and this carbon is released when they are disturbed...It is difficult to understand the logic of damaging long-term carbon stores to install devices whose purpose is to reduce emissions".[37]

In a 2014 report for the Northern Ireland Environment Agency, which has similar peatland, it notes that siting wind turbines on peatland could release considerable carbon dioxide from the peat, and also damage the peatland contributions to flood control and water quality: “The potential knock-on effects of using the peatland resource for wind turbines are considerable and it is arguable that the impacts on this facet of biodiversity will have the most noticeable and greatest financial implications for Northern Ireland.”[38]

See also[edit]

References[edit]

  1. ^ http://www.eirgrid.com/media/All-Island_Wind_and_Fuel_Mix_Report_December_2014%20%282%29.pdf All-island Wind and Fuel Mix report for December 2014
  2. ^ a b "Ireland’s Clean Energy Hits Record Output". 7 Jan 2015. Retrieved 29 January 2015. 
  3. ^ "Wind has capacity to power up to 1.3 million homes". The Irish Times. 24 March 2012. 
  4. ^ Green Inc Blog on the New York Times Website
  5. ^ "Eirgrid discusses wind power targets". RTÉ News. 15 September 2010. 
  6. ^ [1]
  7. ^ [2]
  8. ^ World Wind Energy Report 2008
  9. ^ Eirgrid Wind Generation Statistics
  10. ^ "Airtricity market gain continues with new 16-turbine €50m plant". Irish Independent. 
  11. ^ "System records" EirGrid. Retrieved: 8 January 2015.
  12. ^ EU Directive 2001/77/EC - http://ec.europa.eu/
  13. ^ http://www.airtricity.com/assets/Uploads2/Press-Releases/Offshore-support-press-release1.pdf
  14. ^ http://www.insideireland.ie/index.cfm/section/news/ext/windfarms001/category/896
  15. ^ Fiona Harvey (6 February 2012). "Offshore wind turbines set to benefit British industries". The Guardian (London). 
  16. ^ Developing the Green Economy in Ireland 2-12-2009 Page 41 http://www.forfas.ie/media/dete091202_green_economy.pdf
  17. ^ [3] IWEA current issues
  18. ^ SSE Renewables page on Meentycat
  19. ^ SSE Renewables Homepage
  20. ^ Hibernian Windpower page on Derrybrien
  21. ^ ESBI Wind Energy Homepage
  22. ^ SWS page on Lisheen
  23. ^ SWS Homepage
  24. ^ http://srren.ipcc-wg3.de/report/IPCC_SRREN_Annex_II.pdf Special Report on Renewable Energy Sources and Climate Change Mitigation
  25. ^ White, S. W. (2007). "Net Energy Payback and CO2 Emissions from Three Midwestern Wind Farms: An Update". Natural Resources Research 15 (4): 271–281. doi:10.1007/s11053-007-9024-y.  edit
  26. ^ a b "IPCC Working Group III – Mitigation of Climate Change, Annex II I: Technology - specific cost and performance parameters" (PDF). IPCC. 2014. p. 10. Retrieved 1 August 2014. 
  27. ^ "IPCC Working Group III – Mitigation of Climate Change, Annex II Metrics and Methodology. pg 37 to 40,41" (PDF). 
  28. ^ "Impact of Wind Generation in Ireland on the Operation of Conventional Plant and the Economic Implications" (PDF). ESB National Grid. February 2004. Archived from the original (PDF) on 2007-12-01. Retrieved 2008-01-15. 
  29. ^ "Life Cycle Greenhouse Gas Emissions of Utility-Scale Wind Power Systematic Review and Harmonization Stacey L. Dolan and Garvin A. Heath Article first published online: 30 MAR 2012 DOI: 10.1111/j.1530-9290.2012.00464.x". 
  30. ^ "IPCC Working Group III – Mitigation of Climate Change, Annex II Metrics and Methodology. pg 37 to 40,41" (PDF). 
  31. ^ http://www.irishtimes.com/news/derrybrien-lives-in-fear-of-unknown-from-mountain-1.388400
  32. ^ http://www.newscientist.com/article/mg19125591.600
  33. ^ http://www.uel.ac.uk/erg/documents/Derrybrien.pdf Wind farms and blanket peat, Lindsay, Bragg.
  34. ^ http://www.newscientist.com/article/mg19125591.600
  35. ^ http://www.uel.ac.uk/erg/documents/Derrybrien.pdf Wind farms and blanket peat, Lindsay, Bragg.
  36. ^ http://www.theguardian.com/environment/2009/aug/13/wind-farm-peat-bog
  37. ^ http://www.uel.ac.uk/erg/documents/Derrybrien.pdf Wind farms and blanket peat, Lindsay, Bragg.
  38. ^ David Tosh, W. Ian Montgomery & Neil Reid A review of the impacts of onshore wind energy development on biodiversity, Northern Ireland Environment Agency, Research and Development Series 14/02, 2014, p.54

External links[edit]