Pennon Group PLC

Does the core business genuinely avoid or reduce emissions, or build climate resilience? Share of revenue that is actually 'green'. Fossil-dependent models score low.

The core business provides essential water/wastewater services that are climate-critical (adaptation, leakage reduction, peatland restoration, renewables self-generation), but South West Water's 544,429 hours of sewage spills in 2024 — the worst in England and Wales — represent severe, ongoing environmental harm that offsets positive climate-resilience work.

Credible, science-based targets (SBTi), a real net-zero plan with progress to date, and CDP disclosure — not just a dated press release.

Near-term SBTi-validated targets (SBTi approval May 2024) commit the Group to a 68% absolute Scope 1 & 2 GHG reduction by 2032/33 from a 2021/22 base, Scope 2 already down 70%; however, no long-term net-zero SBTi flag yet and Scope 3 reporting only recently expanded.

Operational footprint, labour and social practices, and governance quality across the company's own operations and supply chain.

Sustainalytics rates Pennon 2nd out of 50 global water utilities and CDP awarded A- in both Climate and Water Security for 2024/25, but the persistent one-star Environment Agency pollution rating held for 14 consecutive years, the Brixham cryptosporidium public health crisis, and an ongoing class-action lawsuit covering multiple coastal communities reveal deep operational ESG failures.

Quality of disclosure, independent third-party verification, and how much hard data backs the company's claims.

GHG data (Scope 1, 2, 3) independently assured by DNV; ESG performance assured by Jacobs; TCFD reporting in place since 2020; SASB-aligned databook published; REGOs certified by DNV — disclosure quality is above-average for the sector, though Scope 3 boundary was only recently expanded to include Bristol Water.

Controversies, litigation, pollution, fossil-fuel lobbying, conflict-zone involvement and governance scandals. Higher means cleaner.

South West Water pleaded guilty to supplying water unfit for human consumption (Brixham, £1.85m fine, June 2025), received a £24m Ofwat enforcement package for wastewater failures (September 2025), was fined £2.1m for environmental offences in 2023, faces an expanded coastal community group legal action led by Leigh Day, and has held the EA's lowest pollution rating for 14 consecutive years — an exceptional concentration of regulatory, criminal and civil liability.