This Practice Note provides a detailed overview of the non-domestic Renewable Heat Incentive (NDRHI). It includes an overview of the NDRHI 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 Practice Note provides explanation of the interface between the NDRHI and Feed-in Tariffs (FiT), the NDRHI and the Renewables Obligation (RO), the NDRHI and the Contracts for Difference (CfD), and the NDRHI and the Capacity Market. The Practice Note concludes by introducing the Green Gas Support Scheme, which is the successor subsidy scheme to the NDRHI.