What we said we'd do
We have many customers who want to connect to and use our electricity transmission network. We provide them with network connections, services related to the connection, and ongoing services once they’re connected. We aim to achieve this by becoming a more customer-centric business.
This stakeholder priority is about making it easier for customers to connect to and use the network. In our RIIO-T2 business plan we committed to:
- connecting 13.5GW of customer capacity during RIIO-T2, providing the UK with clean power, flexible storage and access to clean and cheaper power from Europe.
- investing in additional transformer units to provide more network capacity for our demand-side customers.
- providing an agile service tailored to suit the needs of our rapidly changing customer base. We will do this by investing in our customer relationships and support systems.
- delivering positive outcomes in the output delivery incentives (ODIs) to manage outages better and deliver faster connections.
What we have done and what we’re going to do
During 2025/26, we continued to progress the Accelerated Strategic Transmission Investment (ASTI) programme, which is designed to speed up delivery of the major network upgrades needed to connect more low carbon power and strengthen the transmission system. The programme includes 17 major network projects, with six6 now in construction, helping to create the capacity needed to move electricity from where it is generated, to where homes, businesses and communities need it.
This investment is a key part of enabling the UK’s clean energy ambitions, including the Government’s target for up to 50GW of offshore wind by 2030. We are continuing to work with Ofgem, NESO, government, supply chain partners and affected communities to develop and deliver the network in a way that supports a cleaner, more secure energy system while carefully considering local impacts. As individual projects progress, we will continue to explain why new infrastructure is needed, consult with communities and stakeholders, and use their feedback to help shape our proposals.
Quality of Connections
Providing an agile, customer-focused connections service remains a key RIIO-T2 commitment. In 2025/26 we achieved a Quality of Connections score of 7.0 against the Ofgem target of 7.7, improving performance by 0.5 points from the previous year despite significant industry-wide change associated with Connections Reform. The reform programme has altered the way customers progress through the connections process and has created uncertainty around connection dates for some projects, particularly in the earlier stages of the customer journey. In response, we increased customer engagement, enhanced communication and transparency, and tailored support to customers' evolving needs. These improvements contributed to higher satisfaction scores across several connection milestones, while customers already connected to the network rated their experience particularly highly at 9.3 out of 10. We will continue working with NESO and industry partners to improve the customer experience and support the connection of the generation, storage and demand capacity needed to deliver Britain's clean energy ambitions.
Timeliness of connections
A key RIIO-T2 commitment was to provide customers with timely access to the electricity transmission network and support the connection of the generation, storage and demand capacity needed for Britain's energy transition. During 2025/26, we delivered 519 connection offers to NESO, with 98.8% issued within the required timescales. Despite continued high levels of customer demand, only six offers were delivered outside regulatory timescales. This performance reflects the dedication of our teams in processing connection applications efficiently and supporting customers seeking access to the transmission network. We remain focused on providing a responsive and reliable service that enables customers to connect the infrastructure needed to support decarbonisation and long-term economic growth.
Generation and demand
During 2025/26, we connected customers requiring 0.87GW of generation capacity and delivered one demand connection, providing a further 0.418GVA of capacity to the network. Over the RIIO-T2 period, we connected 11.8GW of generation capacity, helping to enable the infrastructure needed for the UK's transition to a cleaner, more electrified energy system. We also provided 13.1GW of boundary capacity over the RIIO-T2 period.