Strategy Service
Heat Network Regulations
Helping property investors and operators achieve compliance and efficiency across their heat networks.
Heat networks are undergoing the biggest regulatory change in their history. The government has confirmed that Ofgem will be the statutory regulator, with responsibility for customer protection, transparency and fair pricing. Alongside this, HNTAS will set mandatory technical standards for both new and existing networks. Block One helps you navigate this transition — ensuring compliance, protecting NOI and turning regulation into operational advantage.
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A regulated utility, not an afterthought
Until now, heat network oversight has been fragmented — voluntary standards like CIBSE CP1 guiding best practice but no mandatory enforcement. That is now changing. Ofgem will ensure accountability and fairness. HNTAS will ensure technical quality and performance.
The direction of travel is clear — heat suppliers will need to demonstrate competence not only in building and operating efficient systems, but also in how they procure energy, set tariffs, engage with customers, and disclose performance. This is about much more than compliance; it's about driving efficiency, reducing carbon, and building customer trust.
Ofgem Regulation
Ofgem is now the statutory regulator for heat networks — bringing mandatory customer protection, pricing transparency, and fair treatment obligations in line with gas and electricity markets.
HNTAS Compliance
The Heat Network Technical Assurance Scheme mandates technical standards for all heat networks — new and existing. Compliance is required for continued operation and covers design, construction and performance.
Customer Protection
Heat suppliers must ensure fair billing based on actual consumption, clear communications, robust complaints processes, and dedicated support for vulnerable customers including Priority Services Registers.
Tariff & Procurement
Suppliers must demonstrate efficient energy procurement, cost-reflective tariff setting, and transparent pricing. Ofgem will scrutinise charges to ensure they are not excessive.
Overview
Examples of impact
Utilities Supplier
Gas / Power
Heat Source
Boiler / Heat Pump
Distribution
Internal Network
Communal
Shared Heating
Residents
Individual Units
PurchasingA robust purchasing strategy will protect the Heat Supplier from volatile energy costs.
PerformanceEquipment performance must be measured regularly and reported to customers.
LossesLosses in the supply network must be measured and reported on.
Metering & BillingMetering, billing and communications must meet new regulated standards.
This model assumes the building owner owns the heat generating equipment. If the site is connected to an external heat source (district heat network), slightly different responsibilities apply.
Key Question
Are you a heat supplier?
The regulations define a heat supplier as any organisation that owns or operates a heat network and sells heat to customers. This is deliberately broad — it captures housing associations, local authorities, private developers, energy service companies, and managing agents.
Even a landlord operating a communal heating system could fall into scope. Whoever is legally defined as the supplier will be accountable to Ofgem for compliance — including fair tariffs, accurate billing, transparent communication, and adherence to HNTAS technical standards.
Housing associations
Local authorities
Developers & ESCOs
Landlords or managing agents of communal systems
Private operators of district heating schemes
Supplier Responsibilities
Energy Procurement
Source energy efficiently and cost-effectively
Balance price stability with decarbonisation
Demonstrate robust purchasing strategy
Tariff Setting
Set fair, transparent tariffs
Ensure charges are cost-reflective
Communicate pricing clearly to customers
Customer Treatment
Accurate billing based on actual consumption
Proper metering infrastructure
Clear communication and robust complaints processes
Customer Protection
Fair treatment of end customers
Heat networks have often been criticised for opaque billing, lack of accountability, and inconsistent service standards. The new regime changes that. Heat suppliers will be legally required to treat customers fairly — not just as a best practice aspiration, but as a regulated obligation. Special attention is being placed on vulnerable customers, with protections mirroring those already established in the electricity and gas sectors.
Fair Billing
Based on actual meter readings, not estimates.
Clear Communication
Transparent tariffs, plain-language bills, proactive updates.
Complaints & Redress
Clear processes, aligned with Ofgem standards.
Vulnerable Customers
Priority Services Register, accessible formats, advance notice of interruptions.
Customer Rights Parity
Protections aligned with gas and electricity markets.
Technical Standards
Understanding HNTAS
The Heat Network Technical Assurance Scheme is a mandatory scheme — not voluntary best practice. It mandates technical requirements for all heat networks from communal to city-wide systems, including both new build and existing legacy networks.
HNTAS will assess heat networks at different stages of their lifecycle to ensure they meet minimum technical standards, building upon the established voluntary standards set out in CIBSE CP1 (2020).
New networks
Must meet HNTAS before design, construction and operation — and after two years of operation.
Existing networks
Must demonstrate compliance with HNTAS to continue operating.
CP1 (2020)
Aligning with CIBSE CP1 significantly helps prepare for HNTAS standards.
HNTAS Benefits
Reduce carbon emissions by making heat networks more efficient
Improve affordability by reducing capital and operational costs
Enhance customer experience with improved reliability and quality
Strengthen accountability for planning, construction and maintenance
Build investor confidence in heat networks
Enhance transparency of heat network performance
HNTAS is not only about compliance — it's about driving efficiency, reducing costs and improving the customer experience.
Operational Excellence
Optimisation of technical operations
Proactively managing a heat system requires addressing both resident satisfaction and technical performance — ensuring efficiency, reliability, and transparency across your network.
System Efficiency
- On-site audits including efficacy calculations
- Energy flow visualisations across sites
- Heat loss analysis for accurate resident billing
Metering & Monitoring
- Utilise existing metering or provision sub-metering
- Centralised performance dashboards
- Reporting on consumption, costs and emissions
Decarbonisation
- Costed roadmap to electrification or operational Net Zero
- Assessment of existing infrastructure
- Phased implementation aligned to SBTI targets
Technology & Experience
- Real-time energy usage dashboards
- Usage alerts and historical trend data
- Accessible communication in tailored formats
Let's protect NOI, keep residents satisfied and minimise energy costs
Whether you're preparing for Ofgem regulation, need a compliance gap analysis, or want to transform your heat network operations — talk to us.
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