Regulatory library
Every year, we produce an annual performance report. This meets the regulatory accounting guidelines issued by our regulator, Ofwat.
The reports explain how we're performing as a business. We also provide an update on our performance commitments. These measure the level of service provided for a particular outcome. We publish these results annually, every summer.
Annual performance report (APR)
All APR 2024-25 documents
- Annual Performance Report 2024-25pdf | 16.2 MB
- 2024-25 Annual Performance Report tables excluding tables 3A-3Ixlsx | 1.9 MB
- Thames Water reporting criteria 2024-25pdf | 2 MB
- Thames Water Accounting Methodology Statement 2024-25pdf | 1.3 MB
- Compliance with common guidance 2024-25pdf | 2 MB
- Glossary of terms and acronyms used in our Annual Performance Reportpdf | 884.1 KB
- PR19 in-period adjustments model for 2024-25xlsx | 294.4 KB
- PR19 ODI performance modelxlsx | 2.4 MB
- Our open data approach 2024-25pdf | 3.9 MB
- Blind year reconciliation commentary 2024-25pdf | 1.5 MB
- BYR bioresources revenue reconciliation 2024-25xlsx | 245.8 KB
- BYR cost of new debt 2024-25xlsx | 217.3 KB
- BYR developer services 2024-25xlsx | 112.9 KB
- BYR land sales 2024-25xlsx | 146 KB
- BYR ODI differences model 2024-25xlsx | 183.4 KB
- BYR past delivery tables 2024-25xlsx | 1 MB
- BYR RCV adjustment model 2024-25xlsx | 1.7 MB
- BYR residential retail reconciliation 2024-25xlsx | 118.8 KB
- BYR revenue adjustment model 2024-25xlsx | 6.2 MB
- BYR revenue forecasting incentive (RFI)xlsx | 243.3 KB
- BYR RPI-CPIH wedge 2024-25xlsx | 2.6 MB
- BYR Strategic Regional Water Resources 2024-25xlsx | 26 MB
- BYR TOTEX aka cost sharing 2024-25xlsx | 429.4 KB
- BYR water industry national environment programme (WINEP) reconciliation 2024-25xlsx | 625.1 KB
- BYR water trading 2024-25xlsx | 276.4 KB
- BYR water trading incentive compliancepdf | 274.7 KB
- BYR Strategic Regional Water Resources Template 2024-25xlsx | 41.3 KB
Previous APR
View our reports from 2016 to 2024.
Results and presentations
Our latest annual reports and accounts, and our sustainability reports.
Our five year plan
We're pleased to present our five-year business plan for 2025 to 2030.
Service commitment plan
Our Service Commitment Plan sets out what we’re doing to improve our performance.