This Practice Note provides a detailed overview of the non-domestic Renewable Heat Incentive (RHI). It includes an overview of the non-domestic RHI eligibility requirements, application process and ongoing obligations. It also includes a summary of the substantive changes that were implemented by the Renewable Heat Incentive Scheme Regulations 2018 and the further changes introduced by the Renewable Heat Incentive Scheme and Domestic Renewable Heat Incentive Scheme (Amendment) Regulations 2018. This includes coverage of the ‘tariff guarantees’, updated power efficiency requirements, biomethane commissioning, and new forms of excluded heat use. The note concludes with an explanation of the interface between the RHI and Feed-in Tariffs (FiT), the RHI and the Renewables Obligation (RO), the RHI and the Contracts for Difference (CfD), and the RHI and the Capacity Market.