Earnings before interest, taxes, depreciation and amortisation (Ebitda) in the group's renewable business totalled €1.14 billion – a zero per cent change from last year, according to the nine-month report.
Revenues totalled €1.88 billion, a 2.9% increase.
The results were aided by strong production in the UK, which saw a 20.9% increase in average operating capacity and a 17.8% increase in load factor.
The results were also boosted by a strong showing in the US and Brazil that have enjoyed strong wind resources.
Iberdrola's renewable's results suffered, however, by lower wind resource in Spain, which brought the earnings down to the same level as last year, the company said.
The Spanish group's overall Ebitda was 5% lower than 2016 due to the "impact of extraordinary external conditions, namely due to low hydropower output", the company said.
