Paying for the wires, by location
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What the charge covers
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Why location matters
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The point of a locational signal
TNUoS is meant to make users face the network cost they impose — so generation and demand site themselves efficiently, not just wherever land is cheapest.
Locational + residual, zone by zone
The charge has a forward-looking locational part (what your location costs the network) and a residual part (recovering the rest of the network's allowed revenue). Generators and demand are charged on different bases.
Estimate a generator's locational chargei
Pick a zone and a project size to see the annual TNUoS bill (or credit).
Wider locational
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Local
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Residual
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The maths behind the locational tariff
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Who pays
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The north–south gradient
The single clearest picture of the locational signal: what a generator pays per kW of capacity, zone by zone, from the far north of Scotland down to the south coast.
Zonal TNUoS tariffs (£/kW/year)
Northern zones pay the most; southern zones can be paid (negative charge).
Why volatility is a reform driver
Generation tariffs for selected zones across charging years — large year-on-year swings make investment hard to plan.
Zonal tariff table
Every zone used in the charts above, with the charging year stated.
From the TCR to REMA — a moving target
TNUoS has been reformed and re-reviewed repeatedly. Here's the timeline, and the core argument: stronger locational signals are more efficient, but more volatile and harder to invest against.
The case for stronger locational charging
The case against (or for caution)
Where these figures come from
Primary & authoritative sources
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