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Automating access to water social tariffs

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UK water bills are set to rise in April 2025, with the average household facing an annual increase of £133 per year. As a result, the number of households relying on social tariffs is expected to grow by 600,000 this year, rising from 1.6 to 2.2 million people, and could reach nearly 3 million by 2030.

Thames Water is increasing the support available to customers in difficulty, primarily through social tariffs. However, despite extensive outreach efforts, take up of social tariffs has suffered from low awareness, and customers sometimes struggle to complete an application.

Thames Water has a data sharing agreement with DWP to ask who is in receipt of means tested benefits, such as Universal Credit or Pension Credit. The data only provides a Yes/No indicator of receipt, which lacks the detail needed to effectively target social tariffs to those most in need.

Auto enrolment approach

This paper presents the methodology and results of a pilot project with Thames Water in partnership with Richmond and Wandsworth Councils to identify candidates for auto enrolment in social tariffs.

Thames Water holds data on customers struggling to pay their water bills. Local authorities hold benefits administration data, which can be used to better identify and target support to households who are struggling financially. In this context, a data sharing agreement has been established between two local authorities (Richmond and Wandsworth Councils) and Thames Water, under the Digital Economy Act.

  • Thames Water shared data on residents facing difficulties in paying their water bills, specifically those already in arrears or at risk of falling into arrears
  • Local authority data was processed by Policy in Practice, a third-party provider of social policy analytics, to proactively identify eligible residents and match them across the two datasets

Only eligible households in water arrears matched to means tested benefits data will be auto-enrolled by Thames Water at this time. Eligible households at risk of falling into water arrears may be auto-enrolled in a later stage of this project.

Headline findings

  1. For the 2,934 matched customers in arrears, we have identified 1,234 (42.1%) households eligible for and not currently claiming a social tariff. These customers will be auto-enrolled in March, each household receiving £316 on an annual basis. The annualised impact of auto enrolment in March worth over £390,000.
  2. Taking into account rising bills, 345 additional households in arrears could be auto-enrolled from April, while also increasing the average saving to £420 per year. The total annualised impact from April would be £664,000.
  3. A further 624 households could potentially be auto enrolled if we include those at risk of arrears, taking the total impact to over £930,000 on an annual basis.

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