Heat networks 2026: HNTAS and Ofgem
Heat networks are now regulated by Ofgem across Great Britain. The new regulatory framework introduces consumer protection requirements, registration obligations and ongoing regulatory oversight for heat network operators and suppliers.
For most organisations, the immediate priority is understanding whether registration applies to their heat network and preparing the information required by Ofgem. Existing heat network operators and suppliers must register by 26 January 2027.
Alongside the new regulatory framework, government is developing the Heat Network Technical Assurance Scheme, known as HNTAS. HNTAS is planned to launch in 2027 and will introduce technical standards, performance monitoring and assurance requirements for heat networks.
The first step is identifying every communal and district heat network within your portfolio and understanding who carries the regulated responsibilities for operating and supplying each network.
You should then review the information available for each network, including ownership arrangements, customer information, metering arrangements, billing processes and technical documentation required to support registration.
Organisations should also begin reviewing the quality of their metering and operational data. Reliable data will support registration, future HNTAS readiness and long-term operational performance.
The Heat Network Technical Assurance Scheme is being developed by government to help heat network operators demonstrate compliance with future technical standards and performance requirements.
Government guidance indicates that HNTAS will apply to both new and existing heat networks and will be introduced in phases. The scheme is intended to improve heat network performance, reliability, efficiency and consumer outcomes.
While the final scheme continues to develop, published draft documents indicate increasing emphasis on metering, monitoring, technical documentation, operational records and performance reporting.
KJ Tait supports building owners, heat network operators, suppliers and managing agents with heat network registration, HNTAS readiness reviews, metering assessments and data validation.
Our building services engineering, energy metering and operational performance expertise helps clients understand current regulatory requirements while preparing for future technical assurance obligations.
Ofgem began regulating heat networks across Great Britain on 27 January 2026.
Relevant existing heat network operators and suppliers must register with Ofgem by 26 January 2027.
Heat network registration requires relevant operators and suppliers to provide Ofgem with information about their organisation, ownership, heat networks, financial resilience and consumer protection arrangements.
No. A notification made under the previous heat network metering and billing regime does not replace the new Ofgem registration requirement.
HNTAS is the Heat Network Technical Assurance Scheme. It is being developed to help heat network operators demonstrate compliance with future technical standards and performance requirements.
Current government guidance indicates that HNTAS is planned to launch in 2027 and will be phased in over time.
Yes. Government guidance indicates that the technical standards will apply to both new and existing heat networks. Existing networks are expected to receive transition periods as the requirements are phased in.
Potentially. The answer depends on whether the system meets the definition of a relevant heat network, which regulated activities are being carried out and which organisations act as the operator and supplier. Commercial and mixed-use developments should assess their position rather than assume they sit outside the framework.
Registration information may include organisational details, ownership arrangements, financial resilience information, heat network details and consumer protection arrangements.
The immediate priorities are identifying every heat network within the portfolio, establishing operator and supplier responsibilities, preparing information for registration and reviewing the quality of available metering and operational data.