UK non-commodity charge · Transmission · Electricity
TNUoS demand charge (half-hourly)
Latest published rate, who sets it, and where it is forecast to go.
What TNUoS demand charge (half-hourly) is, who sets the rate, what the revenue funds and where it is heading. Rates come from the Purely Energy non-commodity cost data hub; forecasts are our own.
TNUoS demand charge (half-hourly): what it is, who charges it, and what it pays for
What it is
The TNUoS demand charge (half-hourly) charge in plain English
Locational transmission demand charge for half-hourly metered sites, set per TNUoS zone in pounds per kW of average demand across the three winter peak half-hours (the Triads, November to February). Since the Targeted Charging Review took effect in April 2023 the larger residual element of TNUoS is recovered through fixed daily TDR bands instead, so this locational element is now the smaller part of the transmission charge for most sites.
Introduced 1990 (privatisation). Reduced importance since TCR reform in 2023.
Who charges it
The body that sets the rate
NESO (National Energy System Operator)
Unit
GBP/kW
Applies to
Half-hourly metered electricity supplies
What it pays for
Where the revenue ends up
National high-voltage transmission network (275kV/400kV pylons and cables)
Published rate history
| Financial year | Rate | Year on year | Source |
|---|---|---|---|
| 2020/21 | 48.002GBP/kW | - | Published |
| 2021/22 | 49.337GBP/kW | +2.8% | Published |
| 2022/23 | 53.092GBP/kW | +7.6% | Published |
| 2023/24 | 2.161GBP/kW | -95.9% | Published |
| 2024/25 | 2.312GBP/kW | +7.0% | Published |
| 2025/26 | 2.975GBP/kW | +28.7% | Published |
| 2026/27 | 2.927GBP/kW | -1.6% | Published |
Forecast trajectory
Forecasts from our non-commodity cost model. P10, P50 and P90 are the 10th, 50th and 90th percentile outcomes; P50 is the central estimate.
| Year | P10 | P50 | P90 | Confidence | Rationale |
|---|---|---|---|---|---|
| 2026-27 | 0.0670 | 0.0746 | 0.0820 | med | RIIO-T3 transition effects create moderate uncertainty around methodology changes |
| 2027 | - | 3.663 | - | - | |
| 2027-28 | 0.0698 | 0.0776 | 0.1120 | low | Wide confidence interval reflects RIIO-T3 implementation uncertainty and potential CUSC modifications |
| 2028 | - | 3.080 | - | - | |
| 2028-29 | 0.0750 | 0.0835 | 0.0980 | med | Mid-price control period provides greater certainty as transmission capex accelerates |
| 2029 | - | 4.650 | - | - | |
| 2029-30 | 0.1050 | 0.1209 | 0.1350 | med | Aligns with published NESO forecasts, reflecting transmission investment for net zero |
| 2030 | - | 4.499 | - | - | |
| 2030-31 | 0.0850 | 0.1014 | 0.1200 | low | Divergent analyst opinions on allocation between TRIAD and residual charges |
| 2031 | - | 4.589 | - | - | |
| 2031-32 | 0.0900 | 0.1106 | 0.1350 | low | Highly speculative given lack of regulatory clarity around RIIO-T4 frameworks |
| 2032 | - | 4.681 | - | - | |
| 2032-33 | 0.0950 | 0.1206 | 0.1500 | low | Contingent on future regulatory frameworks, should be treated as speculative |
| 2033 | - | 4.775 | - | - | |
| 2033-34 | 0.1000 | 0.1303 | 0.1650 | low | Assumes continued transmission investment trajectory but methodology could change |
| 2034 | - | 4.870 | - | - | |
| 2034-35 | 0.1050 | 0.1381 | 0.1750 | low | Highly speculative estimate contingent on unknown RIIO-T4 parameters |
TNUoS demand charge (half-hourly) FAQs
What is the TNUoS demand charge (half-hourly) charge?
Locational transmission demand charge for half-hourly metered sites, set per TNUoS zone in pounds per kW of average demand across the three winter peak half-hours (the Triads, November to February). Since the Targeted Charging Review took effect in April 2023 the larger residual element of TNUoS is recovered through fixed daily TDR bands instead, so this locational element is now the smaller part of the transmission charge for most sites.
Who sets the TNUoS demand charge (half-hourly) rate?
The TNUoS demand charge (half-hourly) rate is set by NESO (National Energy System Operator).
What does TNUoS demand charge (half-hourly) pay for?
TNUoS demand charge (half-hourly) revenue supports National high-voltage transmission network (275kV/400kV pylons and cables).
What is the latest published TNUoS demand charge (half-hourly) rate?
For 2026/27, the published TNUoS demand charge (half-hourly) rate is 2.927 GBP/kW.
What is the TNUoS demand charge (half-hourly) forecast?
Our latest forecast for 2027-28 is 0.0776 GBP/kW (low confidence). Wide confidence interval reflects RIIO-T3 implementation uncertainty and potential CUSC modifications
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Rate data from the Purely Energy non-commodity cost data hub (dh.purelyenergy.co.uk). Published rates come from statutory publications by the body listed above; forecasts are modelled from published guidance and market trends, so treat P50 as a central estimate and use P10/P90 for sensitivity. Primary source