Every five years, Ofwat sets the funding that water companies can recover from customers to deliver investment and services. Because these plans are agreed several years in advance, new investment needs can emerge during the regulatory period.
The Cost Change process allows water companies to apply for additional funding for specific projects where there is a clear need for investment that could not be fully determined when the original plans were agreed. This can include areas such as maintaining and improving infrastructure, supporting growth and new development, enhancing cyber security, and meeting new environmental or water quality requirements.
The process helps ensure companies can respond to changing needs and continue delivering resilient, reliable services for customers and communities.
Accelerating Investment Cost Change Submission 2026
Accelerating Investment Cost Change Submission 2026 was submitted on 01 May 2026. The submission covering South West Water and SES Water can be accessed here.
Accelerating Investment Cost Change Submission 2026 Draft Determination Representation
Accelerating Investment Cost Change Submission 2026 Draft Determination Representation was submitted on 24 September 2026. The submission covering South West Water and SES Water can be accessed here.
Pennon Cost Change 2026 Draft Determination Response Appendix 1
Annex 1 to the representation on 24 September sets out the support of the WaterShare+ Advisory Panel and can be accessed here.