The figure is down from 33% in 2011 and a peak of 35% in 2010 due to low reservoir levels at hydroelectric dams.
By comparison, renewables last year represented 11.7% of total production in the UK and 23% in Germany.
But while the roll-out of renewables continues at a fast pace in much of Northern Europe, the addition of new capacity has met serious obstacles in Spain, which has implemented harsh austerity measures to counter its debt crisis.
Solar
