British Gas is a major UK energy supplier providing gas and electricity to millions of residential and business customers.
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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. Fees pay for the review, never the result. Last verified May 2026.
That places British Gas joint 614th of 847 companies scored, and 17th of 20 in Energy Supply / Utilities.
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.
Its three lowest-scoring questions, and what the evidence didn't show.
No TNFD disclosure, biodiversity policy, or nature impact assessment found.
No formal waste reduction targets or circular economy commitments published.
No water consumption data, footprint, or management policy published.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →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).
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 →The formula and all 12 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
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.
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. The company serves customers in the UK and Ireland.
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