ScottishPower sustainability score: 51/100
Leading practice starts at 60. The highest score on SINK is 71.
ScottishPower is a major UK electricity supplier and network operator owned by Spanish utility Iberdrola. Founded in 1990 and headquartered in Glasgow, it operates generation assets (predominantly offshore and onshore wind), distribution networks across central and southern Scotland, and retail energy services for 3+ million customers.
Founded 1990Head office Glasgow, GBStaff ~6,300Revenue ~£9.5BWebsite ↗
ScottishPower has structurally exited fossil fuel generation and now sources 100% renewable electricity, with parent Iberdrola holding SBTi-validated net-zero targets. However, the company consolidates emissions reporting into Iberdrola's group figures, obscuring UK-specific transparency. Biodiversity targets are forward-looking, waste circularity unverified, and subsidiary-level data gaps limit independent scrutiny.
ScottishPower scores 51/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified May 2026.
That places ScottishPower joint 129th of 1,023 companies scored, and 2nd of 21 in Energy Supply / Utilities.
What is ScottishPower doing well, and where does it fall short?
Strongest on Energy Source and Targets & Commitments (9/10, 8/10). Weakest on Water Impact and Resource Use & Waste (4/10, 5/10).
Where ScottishPower lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Its effect on waterMeasure its water footprint and set reduction targets.
- How it uses materials and handles wasteReport measurable waste or recycling targets publicly.
- Emissions from its own operationsHave its own emissions independently verified and track them over several years.
Every question that lost points
- Emissions from its own operations6/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain6/10No 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 is9/10Its own operations aren't shown to run on 100% renewable energy.
- Its effect on nature6/10No 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 water4/10No measured water footprint with reduction targets.
- Its climate targets8/10No validated long-term net zero target.
- How openly it reports6/10No annual impact report, or no pay linked to climate targets.
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 ScottishPower's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is ScottishPower's score based on?
12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
67% of them were published by ScottishPower itself; the rest come from independent sources.
Scored on 5 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 ScottishPower compare with other energy supply / utilities companies?
Where ScottishPower sits among energy supply / utilities peers.
Among the 21 major energy supply / utilities brands we've scored, ScottishPower sits 2nd of 21.
Who scores higher in Energy Supply / Utilities?
The one company in the sector scoring above ScottishPower.
See the full Energy Supply / Utilities table →Which companies moved this week, and why.
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