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DESNZ releases new ‘increased’ GGSS tariff rates for 2023-24

The Green Gas Support Scheme (GGSS) released its new tariff rates on 27 April 2023. The new tariff rates have been increased for all 3 tariff tiers.  

Tier 1 rate has been increased by 0.58 pence, tier 2 rate by 0.37 pence, and tier 3 rate by 0.16 pence. The amended tariff rates for the 2023-2024 period are; 


GGSS Mid-Scheme Review 

Ahead of the tariff rate change, DESNZ published the Mid-Scheme Review for the GGSS on 23 March 2023. The consultation will run for eight weeks, addressing a number of items including the waste threshold, digestate mitigation technologies, CHP conversion, methane leakage, sustainability criteria under the GGSS guidance and an opportunity to propose the direction of post-GGSS support. Our analyst team has prepared a comprehensive briefing note that will give you an overview of the contents of the mid-scheme review – Click here to view. 

This Mid-Scheme Review seeks stakeholder views on multiple proposals including the scheme’s close date, tariff guarantee and commissioning deadlines, and waste feedstock threshold among others.  

Proposals in brief are; 

  1. Extending the GGSS closure date to 31 March 2026 
  2. Maintaining current tariff guarantee deadlines 
  3. Maintaining current commissioning deadlines 
  4. Maintaining the current waste feedstock threshold 
  5. Maintaining GGSS regulations around digestate mitigation requirements 
  6. Maintaining the eligibility criteria of the GGSS to exclude CHP plant conversions to biomethane injection 
  7. Amending regulations related to heat deductions to eligible biomethane to exempt heat produced from heat pumps. 

The Review further calls for evidence on; 

  1. Methane leakage monitoring and mitigation practices to understand the GHG emission savings associated with AD and biomethane and to incentivise sustainable production practices 
  2. Options for a post-GGSS policy framework for biomethane 

ADBA has reached out to all the members providing an opportunity to feed into the response. We look forward to hearing from you. 

If you have any questions or would like to provide feedback and raise your concerns regarding the Green Gas Support Scheme, please email 


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