Glossary of Terms
Key definitions for navigating the new heat network regulatory landscape.
Authorisation Conditions (ACs)
The set of mandatory rules and obligations that heat network operators must follow to maintain their authorisation from Ofgem. There are 29 conditions organised into three sections: Section A (All Authorised Persons, 15 conditions), Section B (Supply, 12 conditions), and Section C (Operating, 2 conditions).
Deemed Authorisation
A transitional status for existing heat networks that allows them to continue operating legally while preparing for full authorisation under the new regulations.
Heat Network Technical Assurance Scheme (HNTAS)
A mandatory technical standard for the design, build, and operation of heat networks, aimed at ensuring efficiency and reliability.
Significant Management Responsibility and Influence (SMRI)
Individuals within a heat network operator's organisation who hold legal responsibility for compliance and decision-making.
Priority Services Register (PSR)
A required list of vulnerable customers who need additional support, particularly during supply interruptions.
Consumer Protection
Protections for heat network consumers delivered through Section A, B, and C conditions, including fair pricing (A6), cost allocation (A7), Standards of Conduct (B1), complaints handling (B4), billing transparency (B6), back-billing limits (B7), Priority Services Register (B8), and Security of Supply (C2).
Bulk Supplier
An entity that supplies heat to a building owner or intermediary, rather than directly to the final consumer.
Small Scheme
A specific classification of heat network based on size and customer numbers, often subject to slightly adapted regulatory requirements.
Heat Network (Market Framework) Regulations 2025
The statutory instrument that establishes the detailed rules for the heat network market, including authorisation and consumer protection.
Ofgem
The Office of Gas and Electricity Markets, now the appointed regulator for the heat network sector in Great Britain.
Energy Act 2023
The primary legislation that granted powers to regulate the heat network sector and appointed Ofgem as the regulator.