Non-Domestic RHI main guidance

Guidance Volumes 1 and 2 provide the main guidance for the Non-Domestic Renewable Heat Incentive (RHI):

• Volume 1 sets out the eligibility requirements of the RHI and how applicants could become accredited or registered before the scheme closed to new applications on 31 March 2021.
• Volume 2 includes the ongoing requirements for RHI participants, information on how periodic support payments are calculated and paid, and our compliance and enforcement powers.

Guidance Volume 2 published 26 June 2026 contains some continuous improvement updates and additional guidance. A summary of updates made in this version is published as a subsidiary document. 

Other main guidance documents on this page:

• The Sustainability Self-Reporting Guidance provides information for participants who are self-reporting.
• The Easy Guide to Sustainability contains a summary of the sustainability regulations.
• The Fuel Measurement and Sampling (FMS) guidance provides information for participants required to determine the renewable proportion of the fuels they use in their installation (and who will be self-reporting on their fuel).
• The Guide to Tariff Guarantees contains information on tariff guarantees.
• The Easy Guide to Account Changes includes information for participants on notifying us of any changes within 28 days, and how to amend account details including a change of authorised signatory and change of ownership.
• The Easy Guide to Amendments provides information on amending an application including in relation to a replaced meter, recalibrating a meter, new heat uses, and adding or removing an ineligible plant.