The primary sources my work draws on, grouped by publisher, with the pieces that use each one. Links go to the publisher’s own page.
Transmission Entry Capacity (TEC) Register
NESO data portal. The register behind the weekly TEC tracker.
Used in: TEC tracker, Edition 2 · TEC tracker, Edition 3 · TEC tracker, Edition 4 · The seven projects the NAO singled out · TEC tracker, Edition 1 · Grid connection dates are sliding · The TEC Register doesn’t show connections reform yet · Seven projects, 4.2 GW, gone from the register · Connection dates and grid upgrades · TEC tracker, Edition 5 · Why does CMP470 make sense? · Why does CMP470 make sense? (post)
NESO data portal. Embedded projects in Scotland only.
Used in: TEC tracker, Edition 4
NESO data portal. Checked whenever an interconnector leaves the TEC Register.
Used in: TEC tracker, Edition 4
Future Energy Scenarios documents, including the Ten Year Outlook 2026 workbooks
NESO. Source of the connected-capacity, demand and utilisation figures for data centres.
Used in: 72.8 GW requested, 4 GW connecting, 1.4 GW drawn · Great Britain’s data centre queue, in three numbers
Final TNUoS Tariffs for 2026/27 (PDF)
NESO, January 2026. Transmission charges, including the demand residual bands.
Used in: What a data centre actually buys from the grid · What sits inside the data centre price gap
Transmission Demand Residual guidance (PDF)
NESO. How sites are banded and charged the fixed residual.
UKPN open data portal. Free account needed to view the data.
Used in: ECR tracker, Edition 1
SSEN data portal.
Used in: ECR tracker, Edition 1 · Four gigawatts left a connection register
Electricity North West (1 MW and above)
ENW open data portal. Schemes under 1 MW are in a separate dataset.
Used in: ECR tracker, Edition 1
Northern Powergrid (1 MW and above)
Northern Powergrid open data portal. Schemes under 1 MW are in a separate dataset.
Used in: ECR tracker, Edition 1
Connection and Use of System Code (CUSC)
NESO.
Used in: Five controls on the connections queue · Ofgem’s data centre milestones may bite at 1MW
Distribution Connection and Use of System Agreement (DCUSA)
DCUSA. Governs the Embedded Capacity Register template.
Energy Networks Association. Section 3, clause 12.11C: review of unused import capacity.
CMP470: Oversubscribed Technologies Commitment Fee
Ofgem, minded-to consultation, 17 September 2026.
Used in: Five controls on the connections queue · Why does CMP470 make sense? · Why does CMP470 make sense? (post)
Proposed data centre connection reforms (Curate)
Ofgem, 29 July 2026.
Used in: Ofgem’s data centre milestones may bite at 1MW · Six rulebooks set a data centre size line · Curate consultation response · Flexible Hybrid Grid Connection
NESO. The Gate 1 and Gate 2 process.
Used in: Five controls on the connections queue · TEC tracker, Edition 4
Ofgem, 4 December 2025.
Ofgem, 30 November 2022.
Access and Forward-Looking Charges Significant Code Review: Decision
Ofgem, May 2022.
Targeted Charging Review: Decision and Impact Assessment
Ofgem, December 2019.
Decision on accelerating onshore electricity transmission investment (ASTI)
Ofgem, December 2022.
Used in: The seven projects the NAO singled out · Connection dates and grid upgrades
Upgrading the electricity transmission network (HC 589)
National Audit Office, 11 September 2026.
NESO to the Environmental Audit Committee. Source of the 72.8 GW data centre request figure.
Used in: 72.8 GW requested, 4 GW connecting, 1.4 GW drawn · Great Britain’s data centre queue, in three numbers
UK Parliament, answered 11 March 2025. DSIT’s estimate of data centre capacity by region.
Used in: Scotland’s data centre applications
Power In (12 Pillars of Change)
TwentyForty. Metered utilisation of data centres on UK Power Networks’ network.
Used in: 72.8 GW requested, 4 GW connecting, 1.4 GW drawn · Great Britain’s data centre queue, in three numbers