Tariff Interoperability

The Tariff Interoperability (TI) consultation sets out how the policy objectives would be achieved. There were 25 respondents to downloadthe 18 questions. Respondents included suppliers, optimisers and trade bodies, some of which represented a collection of industry stakeholders.  

Government welcomes the outcomebroadly positive and supportive response from the majority of stakeholders, and the strong endorsement of the project’s strategic objectives. The majority of comments related to thisensuring the technical detail set out in the consultation delivered on the government’s policy intent in practice. 

The most significant elements of feedback related to the practicality of the proposed delivery timetable and to the synergies between the Tariff Interoperability proposals and government’s wider digitalisation agenda. In summary, stakeholders suggested delivery timelines were too tight and that there would be duplication of efforts as the consumer consent aspect of the TI Arrangements, would be delivered in parallel to the Consumer Consent Solution (CCS, also being delivered by RECCo) which addresses the same need.

Tariff Interoperability will support consumer-led flexibility by standardising how electricity tariff pricing data is shared across the market. This will make it easier for optimisation services and Energy Smart Appliances (ESAs), such as electric vehicle chargers, heat pumps and battery systems, to respond to electricity price signals using consistent, machine-readable tariff data, helping consumers reduce bills and optimise energy usage. 

Following consultation feedback, the Department for Energy Security and Net Zero (DESNZ) and the Retail Energy Code Company (RECCo) have updated the implementation approach for Tariff Interoperability in a number of ways. The most substantial change is to support a more manageable delivery timeline and alignment with the Consumer Consent Solution (CCS). As a result we are breaking down phase 1 into a public feedback.and private data route to access tariff data: 

Phase 1a – Public Tariff Pricing Data - Go-live: 18 February 2027

• Phase 1a introduces standardised access to Public Tariff Pricing Data through Supplier Application Programming Interfaces (APIs). This enables optimisation services and Energy Smart Appliances to use tariff pricing data where consumers can share their Supplier and tariff details. 

Phase 1b – Consumer Specific Tariff Information - Planned go-live: November 2027

• Phase 1b will introduce the ability for consumers to consent to the sharing of Consumer Specific Tariff Information with authorised third-party providers through CCS-aligned arrangements. Further consultation on the Phase 1b arrangements will take place later in 2026. 

On 18 May 2026, DESNZ will introduce the new SLC11C provisions and will implement REC Schedule 35 into the Retail Energy Code.