Tariff Guarantee applications

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A tariff guarantee allows applicants to the Non-Domestic Renewable Heat Incentive (RHI) to secure a tariff rate before their installation is commissioned and fully accredited on the RHI. The regulations for tariff guarantees were introduced on 22 May 2018.

Tariff guarantees are available for solid biomass CHP, geothermal and biomethane applications of all sizes, as well as for biomass over 1MWth, biogas over 600kWth and ground source heat pumps and water source heat pumps over 100kWth.

There is a new application process for tariff guarantees. For information about tariff guarantees and how to apply see our Guide to Tariff Guarantees.

In order to ensure the RHI scheme stays within budget there are budget controls for tariff guarantees. The budget allocation for tariff guarantees will be set by the Secretary of State and published by the Department for Business, Energy and Industrial Strategy (BEIS).

The below table gives updated information on the status of tariff guarantee applications, and their affect on each year’s allocated budget. We aim to update this table weekly.

Tariff Guarantees table

Information Category Volume
Tariff guarantee applications made 286
Number of provisional tariff guarantee notices issued 139
The number of tariff guarantee applications granted 59
The number of tariff guarantee applications rejected 126
TG number granted Energy source / technology Capacity (kW) / Volume (m3)






Solid Biomass Boiler

Solid Biomass CHP

Ground Source Heat pump





Estimated total tariff guarantee committed spend per FY (GBP) (based on TG issued)
FY 18/19 FY 19/20

FY 20/21

£2,652,973.31 £46,511,808.62


Estimated total tariff guarantee commitment per FY (GBP)
FY 18/19 FY 19/20

FY 20/21

£2,652,973.31 £49,575,433.41