Iberdrola sustainability score: 38/100
Iberdrola is Spain's largest electricity utility and Europe's leading renewable energy producer, with 40,721 employees and €54B annual revenue. The company generates, distributes, and retails electricity and gas across Spain, Portugal, the UK, US, Brazil, and Mexico.
More about Iberdrola
Founded in 1992 as a regional consolidator, it is now a major player in offshore wind and solar development.
Founded 1992Head office Bilbao, SpainStaff ~40,721 (2022)Revenue ~€49BWebsite ↗
Iberdrola leads European utilities on emissions and renewables—84% zero-carbon generation, SBTi-validated net-zero by 2039—but absolute emissions exceed 50 Mt CO₂e and gas operations remain material. Corporate espionage investigation and regulatory fines in US subsidiaries expose governance gaps. Transparency is strong; the transition pathway is real but incomplete.
Iberdrola scores 38/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Scores are free. Companies can never pay for anything about their own score. Last verified May 2026.
That places Iberdrola joint 460th of 934 companies scored, and joint 9th of 20 in Energy Supply / Utilities.
What is Iberdrola doing well, and where does it fall short?
Strongest on Carbon Footprint: Operations and Targets & Commitments (8/10, 8/10). Weakest on Resource Use & Waste and Controversies & Red Flags (5/10, 5/10).
Where Iberdrola lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
- Emissions from its own operations8/10No verified figures published with their method and a falling trend.
- Emissions from its supply chain7/10No full value-chain map or supplier engagement programme.
- Whether its emissions are falling7/10No consistent fall over several years across its operations and supply chain.
- How clean its energy is7/10Less than 90% of its energy shown to be renewable.
- Its effect on nature7/10No verified restoration beyond its own footprint, or supply chain not mapped for nature risk.
- How it uses materials and handles waste5/10No measurable waste or recycling targets reported publicly.
- Its effect on water6/10No water stewardship programme or verified fall in water use.
- Its climate targets8/10No validated long-term net zero target.
- How openly it reports8/10No mission-locked structure, such as B Corp certification.
- Its record on controversies5/10Points deducted for controversies or its business model. The finding is under question 10.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is Iberdrola's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is Iberdrola's score based on?
21 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
62% of them were published by Iberdrola itself; the rest come from independent sources.
Scored on 4 April 2026 under an earlier version of our method. We're re-checking it under the current method.
If you believe a source has been misread or a newer version exists, submit a challenge.
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How does Iberdrola compare with other energy supply / utilities companies?
Where Iberdrola sits among energy supply / utilities peers.
Among the 20 major energy supply / utilities brands we've scored, Iberdrola is tied =9th of 20, with 2 others.
Who scores higher in Energy Supply / Utilities?
The 3 companies in the sector scoring nearest above Iberdrola.
E.ON has SBTi-validated 1.5°C targets with absolute reduction commitments, but delivery remains unverified.
See the breakdown →Vattenfall has cut Scope 1+2 emissions 53% since 2017 and operates 90% fossil-free generation, backed by SBTi validation.
See the breakdown →Octopus Energy has built comprehensive baseline emissions data and SBTi-verified net-zero targets covering all scopes, yet operational emissions are rising due to rapid growth.
See the breakdown →Which companies moved this week, and why.
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