Appendix 3.1.B – Bespoke performance commitment methodology (Ofwat pro forma) Wessex Water

Appendix 3.1.B – Bespoke performance commitment methodology (Ofwat pro forma)

Wessex Water

September 2018

PR19 Business Plan September 2018 1 Appendix 3.1.B – Bespoke performance commitment methodology (Ofwat pro forma) Wessex Water

Business plan section Supporting document

Board vision and executive summary

1 Engaging customers

2 Addressing affordability and vulnerability

3.1 Performance commitment overview

3.2 Triangulation methodology

3.3 Cost benefit analysis – methodology and results Delivering outcomes for 3 3.4 Calculation of incentive rates including customers enhanced incentives

3.5 Inputs to RORE for outcome delivery incentives

3.6 Sharing success – Proposals for a Wessex Water community foundation

4 Securing long term resilience

5 Markets & innovation: wholesale

6 Markets & innovation: open systems & DPC

7 Markets & innovation: retail

8 Securing cost efficiency

9 Aligning risk and return

10 Financeability

11 Accounting for past delivery

12 Securing trust, confidence and assurance

13 Data tables and supporting commentaries

PR19 Business Plan September 2018 2 Appendix 3.1.B – Bespoke performance commitment methodology (Ofwat pro forma) Wessex Water

Table of contents

Outcome A: Affordable bills ...... 5 Company performance commitment reference: Total bill reduction to customers on social tariffs per 10,000 properties ...... 5 Company performance commitment reference: Successful applications for assistance received by the independent advice sector/ third parties ...... 7 Company performance commitment reference: Void sites ...... 10 Company performance commitment reference: Gap sites ...... 12

Outcome C: Better relationships with customers and communities...... 14 Company performance commitment reference: Numbers of customers added to the Priority Services Register ...... 14 Company performance commitment reference: Delivering for customers in vulnerable circumstances ...... 16 Company performance commitment reference: Number of children/students engaged ...... 18

Outcome W: Efficient use of water ...... 18 Company performance commitment reference: Customer reported leaks fixed within a day ...... 19 Company performance commitment reference: Volume of water saved by water efficiency engagement ...... 21

Outcome Q: Excellent drinking water quality ...... 25 Company performance commitment reference: Water quality customer contacts (appearance) ...... 25 Company performance commitment reference: Tackling water quality at home and in the work place ...... 27 Company performance commitment reference: Lead communication pipes replaced (Wessex Water assets) ...... 30 Company performance commitment reference: Event risk index (Wessex Water) (ERI WW) ...... 32

Outcome F: Minimise sewer flooding ...... 38 Company performance commitment reference: Customer property sewer flooding (external) ...... 38 Company performance commitment reference: Sewer flooding risk ...... 41 Company performance commitment reference: North Bristol Sewer Scheme - Trym catchment ...... 46

PR19 Business Plan September 2018 3 Appendix 3.1.B – Bespoke performance commitment methodology (Ofwat pro forma) Wessex Water

Outcome R: Resilient services ...... 48 Company performance commitment reference: Restrictions on water use (hosepipe bans) ...... 48

Outcome E: Protecting and enhancing the environment ...... 50 Company performance commitment reference: Abstraction Incentive Mechanism (Mere) ...... 50 Company performance commitment reference: Natural capital: improve Sites of Special Scientific Interest (SSSI sites) ...... 52 Company performance commitment reference: Greenhouse gas emissions ...... 60 Company performance commitment reference: Working with the communities to improve bathing water experience ...... 63 Compan