Does Wind Energy Reduce CO2 Emissions ?

There has been a lot of coverage recently about how much wind energy is contributing to the electricity grid, but how much CO2 is it really saving ?

The graphs below, based on data from eirgrid dashboard, show that on some days there is absolutely no savings at all.

The two days being compared are 23rd January 2020 and 29th of November 2019. Note that wind generation (blue) on 29th November is over 7 times that of 23rd January 2020 but CO2 emissions (in yellow) are virtually identical.

East West interconnector (in green) minus figures are exports, pluses are imports. At 329 grams CO2 on both days EWIC imports are very close 84 and 81 MW on the 23rd January 2020 and 76 and 1 MW 29th of November 2019 (circled). However, even though wind output is over 5 times higher on the 29th November, CO2 emissions remain static at 329. 

This raises serious questions about the effectiveness of wind energy in the irish grid. 

Thanks to John Dooley for providing the graphs.