You are paid a certain amount per kilowatt hour (kWhth) and calculations are made according to whether your system is designated “simple” or “complex”, or for applications submitted from 24 September 2013, 'standard' or 'multiple'.
For a simple system
Payments are calculated by multiplying the appropriate tariff by the amount of eligible heat generated in the relevant quarterly period. The formula is:
Payment = Tariff level x Heat generated by RHI installation
For a complex system
Once you have entered the meter readings and the three heat data figures required by the IT system on the Non-Domestic RHI Register, the ‘Eligible Heat Output’ (EHO) figure in kWhth will be calculated and displayed. This is the amount that will be multiplied by your tariff to determine the payment amount.
The formula to determine how many kWh have been produced is:
Eligible heat used on system * Heat generated by RHI Installation/Total heat generated on system
For a standard system
Installations using ‘standard’ metering for RHI payment purposes have two options for calculating the eligible heat output (EHO):
Option 1
Payment = Tariff Level x Heat Generated by RHI Installation (EHO)
(NB where there are NO Ineligible heat uses on the system)
Option 2
Payment = Tariff level x Eligible Heat Used by the RHI Installation (EHO)
(NB where there is NO additional ineligible heat generation plant)
For a multiple system
Installations using a ‘multiple’ metering arrangement have to submit:
- the eligible heat generated
- the eligible heat used
- the total heat generated on the system or the total heat used on the system.
Option 1
Payment =
Tariff Level x Eligible Heat Used on System x Heat Generated by RHI Installation/Total Heat Generated on System
Option 2
Payment =
Tariff Level x Eligible Heat Generated by RHI Installation x Eligible Heat Used on System/Total Heat Used on the System
Payments for Biomethane producers
Registered producers of biomethane have a separate payment calculation formula because heat is not generated in the biomethane injection process. For information see Guidance Volume 2, Chapter 6.