British Gas sustainability score: 30/100
British Gas is a major UK energy supplier providing gas and electricity to millions of residential and business customers. Founded in 1973 and headquartered in Windsor, it is owned by Centrica, which also operates oil and gas production (Spirit Energy), LNG assets, and renewable energy capacity across 16.7GW.
More about British Gas
The company serves customers in the UK and Ireland.
Founded 1973Head office Windsor, United KingdomStaff ~20,000Revenue ~£26.5BWebsite ↗
British Gas operates as a major energy supplier with significant fossil fuel assets through parent company Centrica. Emissions are externally assured but absolute levels remain massive (~39Mt total). Core weaknesses: near-term emissions projected to rise, unvalidated net-zero targets, junk carbon offsets from controversial projects, and active lobbying against climate-aligned energy policy.
British Gas scores 30/100 (Significant gaps) 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 British Gas joint 687th of 934 companies scored, and 17th of 20 in Energy Supply / Utilities.
What is British Gas doing well, and where does it fall short?
Strongest on Carbon Footprint: Operations and Transparency & Accountability (7/10, 6/10). Weakest on Nature & Biodiversity Impact and Resource Use & Waste (1/10, 2/10).
Where British Gas lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
- Emissions from its own operations7/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain5/10Most of its supply-chain (Scope 3) emissions aren't measured.
- Whether its emissions are falling3/10No evidence its emissions are falling, not even from energy bills or mileage.
- How clean its energy is4/10Less than half its energy shown to be renewable, or no transition plan.
- Its effect on nature1/10No evidence it knows its main risks to nature.
- How it uses materials and handles waste2/10No active waste reduction, reuse or repair shown.
- Its effect on water2/10No monitoring of water use, or no measures to reduce it.
- Its climate targets3/10No specific targets with dates.
- How openly it reports6/10No annual impact report, or no pay linked to climate targets.
- Its record on controversies4/10Points 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 British Gas's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is British Gas's score based on?
12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
50% of them were published by British Gas 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.
6 of 12 sources are independent of the company.
If you believe a source has been misread or a newer version exists, submit a challenge.
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How does British Gas compare with other energy supply / utilities companies?
Where British Gas sits among energy supply / utilities peers.
Among the 20 major energy supply / utilities brands we've scored, British Gas sits 17th of 20.
Who scores higher in Energy Supply / Utilities?
The 3 companies in the sector scoring nearest above British Gas.
ENGIE reports comprehensive operational emissions with third-party verification and genuine 41% absolute reductions since 2017.
See the breakdown →DCC is a fossil-fuel distributor whose 37 million tCO2e Scope 3 emissions dwarf operational progress.
See the breakdown →Scored as the Eesti Energia GROUP — the oil-shale electricity generation and shale-oil business (Enefit Power) consolidated with the renewables subsidiary (Enefit Green), not Enefit Green alone (which would score far higher in isolation).
See the breakdown →Which companies moved this week, and why.
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