This section is provided as guidance to the Flexibility Market Rule. Therefore, it is not legally binding and falls outside of the formal change management process.
Context
Revenue stacking is about allowing assets to participate in multiple different Sub-markets and hence “stack” revenues across them.
The aim of the rule is to develop clear guidance on stacking for FSPs and set minimum requirements on all System Operators to facilitate stacking.
Revenue Stacking Requirements
The rule sets out 3 core requirements across all Sub-markets:
The use of standard terminology (Jumping, Splitting and Co-delivery) where practical to describe different types of revenue stacking. This requirement is intended to drive common language, not stifle further development in this space
Set out minimum requirements for revenue stacking to be enabled across the different Sub-markets. System Operators are expected to build and maintain the legal and technological routes to support these specific combinations of stacking.
Data reporting. System Operators shall provide the market facilitator with data on which of their Sub-markets are stackable. This will be used to both check that requirement 2 is met, and to populate the Flexibility Market Catalogue, to act as a reference to Flexibility Service Providers on what is allowable.
We believe the impact of these requirements to be:
Impact on System Operators | Impact on FSPs |
|---|
System Operators must build and maintain the systems to enable the minimum level of stacking. They are free to enable more. They should reinforce the use of common language on revenue stacking | The flexibility market catalogue will provide an up-to-date reference on what services are stackable. Common terms will be used in guidance provided across system operators. |
Implementation monitoring requirements
The key requirements are laid out below. A view across the rules is available in our deadline tracker.
Category | Requirement | Trigger for data submission | What we will do with it |
|---|
Implementation tracking | Basic tracking of implementation status and target date | From 11/06/2026 (20 working days after the published date) | Track whether implementation is on track via our Implementation tracker |
Flexibility Market Catalogue data | Status of stacking with regards to all other Sub-markets | From 11/06/2026 Within 10 days of change. | Provide an overview of the sub-market and the market as a whole via the Flexibility Market Catalogue. |
Effectiveness monitoring data | Two metrics highlighting the coverage of the minimum requirements, and the percentage where stacking is required | The metric will utilise the data submitted above. No new data is needed. | Understand the coverage of the and future changes to be delivered via our Effectiveness Monitoring Report. |
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Sections 1, 2, 3 and 4 form the legally binding Flexibility Market Rule.
Defined terms capitalised in this document shall have the meaning given in Section 4.