RIIO-3: What the Next Electricity Network Price Control Means for Businesses
Introduction
From April 2026, the UK electricity network enters a new regulatory period known as RIIO-3.
This is the next phase of Ofgem’s price control framework governing how electricity transmission operators invest in, operate and charge for the national grid. £24 billion of upfront total expenditure (TOTEX) has been approved for the next five years, with expectations to rise to £90 billion by 2031, which covers 80+ major transmission projects.
For businesses planning energy projects, grid connections or major electrification initiatives, RIIO-3 matters because it shapes:
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Network investment priorities
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Infrastructure upgrades
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Grid capacity availability
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The charges businesses ultimately pay to use the electricity network
While the framework itself is technical, its impact will be felt across industries as electricity demand grows and the UK accelerates its transition toward a low-carbon energy system.
What RIIO stands for
RIIO stands for Revenue = Incentives + Innovation + Outputs.
The framework sets the rules that determine how much revenue electricity network operators can recover from consumers while delivering improvements to infrastructure and system performance.
Under RIIO, network companies are incentivised to:
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Invest in reliable infrastructure
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Enable the energy transition
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Improve network resilience
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Support innovation in the electricity system
Each RIIO price control runs for multiple years and sets expectations for investment, performance and charging.
RIIO-3 will replace the current RIIO-2 framework when it begins in April 2026.
Why RIIO-3 is important now
Electricity demand is expected to increase significantly in the coming years due to:
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Electrification of transport
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Heat electrification
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Industrial decarbonisation
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Rapid expansion of renewable generation
At the same time, the UK electricity network must accommodate:
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New grid connections
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Distributed energy resources
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Battery storage projects
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Increased peak demand
RIIO-3 is designed to support the major network upgrades required to enable this transition.
For businesses, this means the regulatory framework will influence how quickly network infrastructure expands to support new projects.
What replaces TRIAD incentives?
Although the TRIAD mechanism has ended, the need to manage electricity demand during peak periods has not disappeared. Instead, the focus has shifted toward flexibility markets and demand response programmes. These include:
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Demand Side Response (DSR)
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Capacity Market participation
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Grid balancing services
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Flexibility programmes run by aggregators or system operators
Rather than simply avoiding three peak events, businesses can now participate in programmes that reward them for adjusting consumption or providing flexibility when the grid needs it.
What changes under RIIO-3
Several themes are emerging as central to the RIIO-3 framework:
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Accelerated grid investment
The electricity system requires significant reinforcement to support renewable energy and electrification.
RIIO-3 is expected to encourage earlier investment in network capacity, helping reduce connection delays and enabling strategic upgrades. |
Greater focus on flexibility
This means businesses capable of adjusting electricity consumption or exporting power may find new opportunities in flexibility markets. |
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Improved connection processes
Grid connection timelines have become a major challenge for developers and energy-intensive businesses. Regulators are therefore placing increasing pressure on network operators to improve:
• Connection processes • Planning transparency • Queue management • Infrastructure delivery |
Support for renewable integration
Large volumes of renewable generation are connecting to the network, particularly wind and solar projects.
RIIO-3 aims to ensure transmission infrastructure can accommodate this growth while maintaining system reliability.
This could help reduce the delays that have affected many projects in recent years. |
What RIIO-3 means for commercial energy users
For most businesses, the impact of RIIO-3 will appear indirectly through network charges and infrastructure availability. However, organisations planning major energy projects should consider the implications carefully.
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Grid capacity availability
Network investment under RIIO-3 may increase the availability of capacity in constrained regions, enabling new projects to proceed.
The investment aims to meet rising demand from electrification, to strengthen electricity transmission and upgrade infrastructure in order to reduce constraints on renewable energy supplies. |
Network charges
Businesses should therefore monitor how price control decisions affect non-commodity costs within electricity bills. |
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Electrification Projects
Many organisations are exploring electrification of:
• Vehicle fleets • Heating systems • Industrial processes
RIIO-3 investment could play a key role in enabling the network capacity required for these transitions. |
Connections Planning
Companies planning new facilities, generation assets or high-load operations should factor network capacity and connection timelines into early project planning.
Understanding the regulatory environment helps organisations anticipate how infrastructure availability may change. |
The role of network intelligence
As the electricity system becomes more complex, businesses increasingly need visibility into:
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Grid capacity
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Infrastructure constraints
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Policy and regulatory developments
Insights into market conditions and regulatory change can help organisations plan projects and procurement strategies more effectively.
Platforms such as Nationwide Utilities’ Insights provide updates and analysis on developments like RIIO-3, helping businesses understand how changes in regulation may affect energy costs, infrastructure access and investment decisions.
Key takeaway
RIIO-3 represents the next stage of the UK’s electricity network transformation.
As the country moves toward a more electrified, low-carbon energy system, the framework will guide how networks invest in capacity, support renewable generation and manage demand.
For businesses, the most important implications will be:
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Evolving network charges
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Improved infrastructure investment
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New opportunities for flexibility
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Changing connection timelines
Understanding these developments early can help organisations plan energy strategies and infrastructure projects with greater confidence.
Fixed purchasing
If your business has a set budget and wants to control their energy costs, a fixed energy contract will guarantee the peace of mind that the rates will remain the same for the entire duration of the contract.
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