Efficacy of wind power in mitigation of CO2 emission from the irish electrical grid

The results in this paper are based on a data set containing system demand, wind generation and CO₂ emission between Jan 2010 and Sep 2013. The data was recorded at 15 minute intervals and reflects the macroscopic operation of the Republic of Ireland´s electrical grid. The data was analyzed by investigating how daily wind generation effected daily CO₂ emission across multiple days with equivalent daily demand. A figure for wind turbine efficiency was determined by dividing the CO₂ mitigation potential of wind power by the CO₂ intensity of the grid; both in units of Tonnes of CO₂ per MWh. The yearly wind power efficiency appears to have increased by 5.6% per year, now standing around 90%. Over the four years significant regularity was observed in the profiles of wind turbine efficiency against daily demand. It appears that the efficiency profile has moved in recent years so that maximum efficiency coincides with most frequent demand.