A previous article covered the remarkable growth of Spanish wind and the success in incorporating this electricity into Spain's grid. It focused on the periods in November when wind provided much of the country's electricity, peaking at almost 54% in the early morning of 8 November 2009. Wind was almost 23% of the Spanish total electricity production during the month of November, beating nuclear for the first time. Solar also grew rapidly in 2009, up from 1% in 2008 to 3% of national output. The effect on CO2 emissions from power generation was striking. Carbon dioxide output fell by over a sixth, largely as a result of the growth in renewables.