Guidance

HNTAS: Draft Substation assessment procedures for new build heat networks

Draft procedures that Heat Network Technical Assurance Scheme (HNTAS) registered assessors will need to follow to assess a heat network’s compliance with HNTAS technical requirements.

Applies to England, Scotland and Wales

Documents

Details

These draft assessment procedures for heat network substations detail the activities to be undertaken to provide assurance that the obligations in the Heat Network Technical Assurance Scheme (HNTAS) Technical Specifications are fulfilled.  

A substation is a connection between distribution networks which contains an exchange of thermal energy (for example, via plate heat exchangers) together with other necessary equipment.

The documents are for use by:

  • heat network assessors
  • heat network developers
  • heat network designers
  • heat network operators

These assessment procedures correspond to the draft HNTAS technical specifications for heat network substations.

Next steps

We will be requesting feedback on the information in these documents shortly. We will run a change management process in parallel with the HNTAS technical standards consultation which will launch shortly.

We will make final versions of these documents available before the scheme starts.

Updates to this page

Published 15 December 2025

Sign up for emails or print this page