José Donoso, head of the Spanish Wind Energy Association, recalled that just five years ago critics had claimed the grid could never cope with more than 14% of its supply from wind.
"We think that we can keep growing and go from the present 17GW megawatts to reach 40GW in 2020," he told El País newspaper.
Windfarms have this month outperformed other forms of electricity generation in Spain, beating gas into second place and producing 80% more than the country's nuclear plants.
Experts estimate that by the end of the year, Spain will have provided a quarter of its energy needs with renewables, with wind leading the way, followed by hydroelectric power and solar energy.
There's got to be some hope for wind power – I'd quite happily see a large portion of East Anglia covered in Turbines and it is in my back yard.