What regulatory changes are affecting heat networks in 2026?

Operators should monitor several parallel threads: HNTAS technical standards and assurance, Green Heat Network Fund and related capital programmes, devolved Scottish measures alongside GB authorisation, and Ofgem's Heat Networks Digital Service ahead of the January 2027 registration deadline. The detail and dates of each move with government and regulator publications.

What is HNTAS and when does it apply?

HNTAS (Heat Network Technical Assurance Scheme) introduces mandatory technical standards for heat networks from 2027, built around Technical Standard TS1 which replaces CIBSE CP1 (2020). Networks built after 2014 and those built before 2015 have staged compliance timelines. Operators whose networks cannot meet standards cost-effectively may have an end-of-life route available.

Does the HNTAS process affect my Ofgem registration deadline?

The HNTAS policy and technical workstreams and the Ofgem registration deadline are separate obligations. The registration deadline of 27 January 2027 is fixed. Operators applying for Green Heat Network Fund support typically need to demonstrate readiness against both authorisation conditions and forthcoming HNTAS requirements.

What is the Green Heat Network Fund and who can apply?

The Green Heat Network Fund (GHNF) provides capital grant support for low-carbon heat network development and upgrades. Funding is allocated through published application rounds; eligibility and territory are set out in the official GOV.UK guidance for each round. HNES (Heat Network Efficiency Scheme) supports performance upgrades for existing networks. Always confirm the current round, dates, and eligibility on GOV.UK.

Do Scottish heat network operators need to comply with both Ofgem and Scottish regulations?

Yes. The Heat Networks (Market Framework) (Great Britain) Regulations 2025 apply in Scotland alongside the existing Heat Networks (Scotland) Act 2021 framework. Scotland has also consulted on an opt-in installation and maintenance licence. Scottish operators face a dual-framework compliance requirement that is distinct from operators in England and Wales.

Recent regulatory developments: Heat network compliance update for UK operators

Key points

HNTAS moves heat networks toward mandatory technical standards from 2027; policy consultation on the scheme has closed, with technical work on draft codes continuing on published timetables
GHNF capital funding has been expanded (£195m per year confirmed through 2029/30 under the Warm Homes Plan); current round dates and which nations are in scope are set in official GOV.UK guidance; grant conditions align with authorisation and HNTAS readiness
Scotland combines GB authorisation with devolved measures under the Heat Networks (Scotland) Act 2021, plus further consultation on an opt-in installation and maintenance licence
Ofgem’s Heat Networks Digital Service is the route to registration; every operator must register by 27 January 2027

Several major regulatory threads have been moving in parallel: technical assurance (HNTAS), capital funding (GHNF and related schemes), devolved Scottish arrangements, and Ofgem’s digital registration platform. This guide summarises what those threads mean in practice for operators preparing for authorisation.

It is not tied to a single news cycle: use it as orientation, then confirm dates, consultation status, and fund rounds on the relevant government, Scottish Government, and Ofgem pages before you rely on them for decisions.

Pre-insulated district heating pipework junction in an open trench during installation

HNTAS: technical assurance

The Heat Network Technical Assurance Scheme will introduce mandatory technical standards for every heat network in Great Britain, replacing voluntary guidance with a formal assurance framework backed by regulation.

The scheme is built around a new technical standard called TS1, which replaces CIBSE CP1 (2020) as the principal reference point. It covers network design, construction, commissioning, and ongoing operation. Compliance will be assessed at key lifecycle stages, and networks will need to pass certification to demonstrate they meet the required standards.

What this means for existing networks. HNTAS applies to both new and existing networks, but with different timelines. Networks built after 2014 must demonstrate minimum metering, monitoring, and performance within three years of scheme launch, with full certification within six years. Pre-2015 networks get longer: initial compliance within three years, full certification within eight years. Networks that cannot cost-effectively meet standards may need to declare end-of-life status within three years and plan replacement.

The policy consultation on HNTAS closed in April 2026. A separate technical feedback process on the draft HNTAS code documents, TS1, and the Metering and Monitoring Standard may still be open or may have closed; check the published BEIS / DESNZ and industry pages for the current deadline before you submit technical comments. BESA has been appointed as the shadow training provider to develop assessor training ahead of the 2027 launch.

Operators should not wait for the final standards to start preparing. Assess your current network performance, identify metering and monitoring gaps, and understand where your systems fall short of TS1 requirements. Operators who begin gap analysis early will be better positioned when certification becomes mandatory.

Our HNTAS Assessment Register is designed for exactly this – tracking network performance against the draft technical specifications across all assessment milestones. Available individually (£125) or in the Complete Bundle (£1,195).

GHNF: funding and compliance expectations

The Green Heat Network Fund has received its most significant expansion since launch. The government’s Warm Homes Plan confirmed £195 million per year in capital funding through to 2029/30, providing long-term certainty that the sector has been calling for.

Applications are handled in published rounds; the current round number, closing dates, and which nations are in scope are set out in the Green Heat Network Fund (GHNF) application guidance on GOV.UK. High-level policy commitments can precede changes to the operational fund pages, so rely on the published guidance at the time you apply.

Why this matters for compliance. GHNF funding comes with conditions. Grant recipients must demonstrate their networks will meet regulatory requirements, including the authorisation conditions and forthcoming HNTAS standards. If you are applying for GHNF funding – or have already received it – your compliance documentation needs to be in order. Ofgem registration, consumer protection arrangements, financial resilience, and supply continuity are not optional extras for funded projects.

The fund is delivered by Triple Point Heat Networks Investment Management. Alongside the GHNF, the Heat Network Efficiency Scheme (HNES) continues to provide support for existing networks needing performance improvements – relevant for operators who may need to upgrade systems to meet HNTAS requirements.

Engineer checking heat interface unit dashboard on a communal heating system

Scotland: devolved frameworks alongside Ofgem

The Scottish Government has consulted on proposals for a new installation and maintenance licence for heat networks. Official consultation materials are published on gov.scot and on consult.gov.scot (Citizen Space); use those pages for closing dates, any published analysis, and next steps as of April 2026.

This is a significant shift from the original approach. The Heat Networks (Scotland) Act 2021 had provided for a mandatory licensing regime, but the UK Energy Act 2023 introduced a GB-wide authorisation system through Ofgem, making the original Scottish mandatory licensing regime redundant in several areas. Rather than duplicating regulation, Scotland is now proposing an opt-in licence that gives heat network organisations access to utility-like statutory powers – things like carrying out roadworks, surveying land, and compulsory purchase rights – without requiring every operator to hold one.

Consultation documents cover the objectives and scope of licensing, the powers available to licence holders, the licence regulator, application procedures, conditions and limitations, duration, and revocation.

For Scottish operators. The GB-wide Ofgem authorisation requirements apply in full – Scottish operators must register with Ofgem by January 2027 like everyone else. The Scottish licence is additional, not alternative. It is relevant primarily for developers and operators who need statutory powers for network installation and maintenance activities. Scotland’s Climate Change Plan 2026–2040 commits to decarbonising heat in buildings by 2045, and heat networks are positioned as a key strategic technology for dense urban areas.

If you operate in Scotland, see our HNO Readiness Pack – Scotland (£295), which covers both the GB-wide Market Framework Regulations and the Scotland-specific requirements under the 2021 Act.

Ofgem: digital registration and the January 2027 deadline

Ofgem’s Heat Networks Digital Service is the platform through which all 14,000+ heat networks in Great Britain must register by 27 January 2027. The service has been rolling out from spring 2026; treat “live” status and any beta labelling as something to verify on Ofgem before you plan submission dates.

Registration is not a formality. Operators must submit detailed information about their organisation, ownership structure, network infrastructure, consumer protection arrangements, financial resilience position, and the identity of persons with significant managerial responsibility or influence. Those individuals must be assessed as fit and proper to hold their roles.

The Energy Ombudsman, which has been receiving heat network registrations since April 2025, has reported registration counts that remain a small fraction of estimated operational sites. The practical point is unchanged: most operators are still early in the process.

The registration window is finite. With a fixed authorisation registration deadline of 27 January 2027, the time available to complete registration depends on when you start and how complete your evidence is. When volumes rise, those who have their compliance documentation prepared in advance will move through the process more smoothly than those assembling evidence under deadline pressure.

Registration requires evidence across multiple areas. Our registration checklist maps every document you need, organised by operational area and priority. The Compliant Bundle (£895) covers the eight core documents most operators will need. See bundle pricing compared side by side.

What operators should do next

These developments are not isolated events. They represent a regulatory framework coming together around the heat network sector. The practical actions for operators are straightforward.

First, understand your registration timeline against the fixed January 2027 deadline, and use Ofgem’s published guidance for the current state of the digital service.

Second, assess your technical position against HNTAS. Even though the scheme does not launch until 2027, the draft technical standards are published and the requirements for existing networks are clear. A gap analysis early avoids a scramble later.

Third, if you are a GHNF recipient or applicant, ensure your compliance evidence matches the standards expected of funded projects. Grant conditions and regulatory conditions are converging.

Fourth, if you operate in Scotland, track Scottish Government publications on the installation and maintenance licence and respond to formal consultation opportunities while they remain open.

For the full picture of what authorisation involves, see our authorisation conditions guide. To understand which documents sit with which team in your organisation, see the responsibilities guide.

This page is updated as material regulatory developments occur. Last reviewed: 22 April 2026.

Recent regulatory developments