Our RIIO-T3 Business Plan

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We have a chance to shape a cleaner, greener future for us all

Publishing our next Transmission Business Plan (RIIO-T3) in December 2024 was a significant milestone for our transmission business and the journey to Net Zero and Clean Power 2030, enabling a more sustainable future for us all. Watch this short video with Nicola Connelly, CEO of SP Energy Networks, to find out more about our plans and the positive impact they will make across Scotland and beyond.

Latest update - Ofgem published its Final Determination on our RIIO-T3 Business Plan on 4 December 2025.

>£12 bn

We will invest up to £12 billion to upgrade and grow our transmission network in Central and Southern Scotland

Around 1,400

New jobs created directly and supporting over 11,000 jobs across Scotland and the UK in the long term

2035

This plan is a key step of our journey to become a Net Zero Networks Business by 2035

5 Years

On the journey to Net Zero, our plans outline our proposals for the 5 years from 2026 to 2031 (RIIO-T3 price control)

Read our Business Plan

We have published a 100-page Business Plan accompanied by a suite of supporting documents including annexes and data templates.

Read our Business Plan

Have your say

Our online survey and Ofgem's 'Call for Evidence' were live from 18 December 2024 to 10 February 2025.

Please register as a stakeholder to be informed of future engagement opportunities.

Timeline

RIIO-T3 Business Plan Submission
11 December 2024

Ofgem Final Determination (FD)
4 Dec 2025

Ofgem Sector Specific
Methodology Consultation (SSMC)
December 2023 to March 2024

Ofgem Call for
Evidence window closes
10 February 2025

Stakeholder Engagement
Ongoing

Ofgem Call for
Evidence window opens
18 December 2024

RIIO-T3 Business Plan
delivery period begins
1 April 2026

Ofgem Sector Specific
Methodology Decision (SSMD)
July 2024

Ofgem Draft
Determination (DD)
1 July 2025

Independent Stakeholder Group Visitation

Find out more about our Independent Stakeholder Group (ISG)

Our Independent Net Zero Advisory Group (INZAC) acted as the Independent Stakeholder Group (ISG) for our RIIO-T3 Business Plan. The group worked closely with teams, scrutinising both the technical plans as well as ensuring any emerging customer issues are fully considered.

Find out more about our INZAC

Videos

We have created a suite of explainer videos to help you find out more about our business plan:

Finance explainer videos

We have also produced a range of explainer videos to explain financial terminology used within our business plan:

Blogs

In the lead up to publication, we shared a series of blog posts talking about the journey of developing our plan.

SP Energy Networks, RIIO-T3 Business Plan Blog. This is how we empower our communities. Jillian Violaris, Partnership & Funding Manager

03/11/2025

RIIO-T3: Digital Enablers

By James Boyle

This blog explores the critical role digitalisation plays in delivering the RIIO-T3 programme and provides an overview of the £5 million investment we are making now in six priority T3 enabler initiatives, all scheduled for implementation ahead of the new price control period commencing on 1 April 2026.