Our RIIO-2 business plan

Ofgem announced its final determinations of our Electricity Transmission business plan for the RIIO-2 regulatory period covering 2021 to 2026. Ofgem’s regulatory framework is known as RIIO (Revenue = Incentives + Innovation + Outputs). The RIIO model offers network companies incentives for innovation and securing investment, so they can develop sustainable energy networks at the lowest cost for current and future customers.

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Final determinations

Ofgem published their final determinations on Tuesday 8 December 2020. We will be studying Ofgem's final determinations package very carefully - it covers a broad range of issues for our business.

Read our statement
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Our RIIO-2 business plan (2021-2026)

We developed our business plan against a background of rapid change in the energy industry.

Our business plan

RIIO-2 Statutory Licence Consultation

We responded to Ofgem’s RIIO-2 Statutory Licence Consultation. This response was on behalf of National Grid Electricity Transmission plc (NGET) and National Grid Gas plc (NGGT). You can read the following response documentation:

Executive Summary

Download the following Annexes

  • Annex Chapter 1-9 of the Special Conditions
  • Annex Special Conditions being removed
  • Annex Standard and Special Conditions being modified
  • Annex PCFH
  • Annex PCFM.

Non-Operational IT Capex reopener

NGET’s redacted submission to the April 2021 Non-Operational IT Capex re-opener. This includes the main submission documents and supporting Annexes. 

Download documents 


Lister Drive Customer Connection

This submission requests additional funding to provide a connection for Statkraft UK connecting to NGET’s Lister Drive 275kV substation following the output from National Grid Electricity System Operator Stability Pathfinder process that will allow Stakkraft to provide ancillary services to reduce constraint cost.

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 Frodsham 400kV Customer Connection

This submission requests additional funding to provide a connection for Mersey Reactive Power connecting to NGET’s Frodsham 400kV substation following the output from National Grid Electricity System Operator High Voltage Pathfinder process that will allow Mersey Reactive Power to provide ancillary services.

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Cellarhead Customer Connection

This submission requests additional allowance to provide a 132kV connection at Cellarhead Grid Supply Point (GSP) in Staffordshire. The connection is to accommodate a feeder circuit connection between Whitfield Bulk Supply Point (BSP) and Cellarhead GSP being installed by Western Power Distribution (WPD), this will allow WPD to continue to operate a compliant network.

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Melksham Operational Tripping Scheme (OTS) Phase 2

This submission requests additional allowance to extend the existing the Melksham Operational Tripping Scheme, this is driven by a range of future Generation Customers connecting into the South West region of England, These additional connections to the Transmission System would result in thermal, voltage and stability issues when particular double circuit unplanned outages occur during certain planned outages.

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National electricity infrastructure protection from extreme weather  

National Grid is seeking funding to deliver 33 additional weather protection projects in years 2 and 3 of RIIO-T2. This investment will protect assets and sites most at risk from surface water flooding, which has increased due to climate change. An additional reopener is also expected in 2023 to cover the remaining sites which require protection during RIIO-T2. 

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SF6 Asset Investment to prevent carbon emissions

National Grid requires funding within this regulatory period (T2), to deliver interventions at electricity infrastructure sites that already have or are predicted to have significant SF6 leakage. SF6 gas is used as an insulating medium used in electricity network assets and is 23,500 times more potent than Carbon Dioxide as a greenhouse gas. This investment is forecast to prevent 500,000 tonnes of carbon emissions until 2030, which is the equivalent of planting more than 8 million trees.

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National Grid Electricity Transmission Independent User Group

We are the Independent User Group responsible for scrutinising National Grid’s RIIO 2 business plan and challenging how they engage with stakeholders. As the Independent User Group, we represent a cross-section of the energy industry and beyond, bringing our individual expertise and experience across a broad range of energy issues.

National Grid Electricity Transmission Independent User Group


RIIO-2 Stakeholder Engagement

We are working to improve our stakeholder engagement – and that is why we place community relations at the heart of our infrastructure projects.  

Read stakeholder engagement case studies


Redaction Explanatory Statement 

Document published in accordance with the RIIO-2 Re-Opener Guidance and Application Requirements Document.
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