Our Scheme Rules set out a common minimum standard in the quality and level of protection for heat network consumers. They apply to each heat network registered with the Heat Trust Scheme.

Click here to download the Scheme Rules.


Minimum Guaranteed Service Payment (GSP) amounts

Our Scheme Rules specify minimum GSP amounts for compensating consumers where supply outages don't meet our Guaranteed Service Standards.

The GSP amounts in the Scheme Rules are given as "(Indexed)". This means that they are given at October 2015 prices (when the Scheme was launched) and must be uprated for inflation using official inflation figures. Since 1 April 2023, the minimum amounts are uprated for inflation once a year and fixed by Heat Trust as the Scheme Administrator.

The minimum amounts that apply from 1 April 2024 to 31 March 2025 are:

Amount Description Scheme Rule
"£30 (Indexed)" = £45 Planned and unplanned interruptions longer than specified period, for each full 24 hours 6.3.1 & 6.3.2
"£500 (Indexed)" = £725 Total limit of above interruption GSPs 6.3.1 & 6.3.2
"£24 (Indexed)" = £35 Failure to make alternative heat provision to vulnerable customer where interruption lasts longer than 12 hours 6.4
"£54 (Indexed)" = £80 Multiple unplanned interruptions above a specified number and duration 6.3.3


The minimum GSP amounts that previously applied for each month since the launch date are shown in this table.