Evidence Series — Scottish Energy Compact — June 2026
Every Scottish household already faces hidden bill increases of £145–225 per year to fund grid infrastructure these facilities require. On top of that, the UK Government proposes to give the world’s wealthiest technology corporations a £24/MWh electricity discount — funded by those same households. This is where the money goes.
Section 1 — The Hidden Household Bill
Connecting a 500MW data centre to Scotland’s grid requires dedicated high-voltage substations, upgraded transmission lines, and significant local network reinforcement. Under current GB regulatory arrangements, a substantial portion of these costs flows through Transmission Network Use of System (TNUoS) and Distribution Use of System (DUoS) charges — recovered from every electricity consumer.
Scottish households are disproportionately exposed due to geographic weighting in the charging methodology. The costs are not listed on your electricity bill. They are embedded in the unit rate and standing charge — invisible, unchosen, and growing.
These mechanisms exist to recover the system-wide costs of operating and expanding the grid. Data centres do not pay for the infrastructure their demand requires — that cost is spread across all consumers. The pipeline as a whole represents a transfer of infrastructure cost from developer to household on a scale that has not been publicly evaluated.
Scotland is being offered the costs, the land, the water and the infrastructure burden. The profits will be booked in Dublin, Seattle or Singapore. That is not a digital economy strategy. It is a subsidy programme dressed up as one.
Michael Knox — Scotland’s Data Centre Reckoning, June 2026| Cost Mechanism | What It Is | Annual GB Cost | Per Scottish HH |
|---|---|---|---|
| TNUoS reinforcement | Transmission upgrades socialised across all users | £400–600m | £35–50 |
| Capacity Market uplift | Cost of procuring backup dispatchable generation | £600–800m | £50–70 |
| Balancing services | Frequency and voltage management at scale | £400–700m | £35–60 |
| Constraint payments | Paying wind off; paying gas on | £300–500m | £25–45 |
| Total additional burden | £1.7–2.6bn/yr | £145–225/yr |
Derived from Ofgem TNUoS/DUoS forecasts, National Grid ESO Network Options Assessment 2024/25, and DESNZ Capacity Market settlement data. Figures are indicative; the direction of travel is not in dispute. No planning application in the pipeline has addressed this. No planning authority has been directed to consider it.
Section 2 — The DSIT Subsidy
In November 2025, the UK Department for Science, Innovation and Technology announced that data centres in Scotland would be eligible for reductions of up to £24 per MWh on their electricity costs. The stated justification: large data centres could absorb surplus renewable energy in Scotland that cannot flow south due to grid transmission bottlenecks, thereby reducing constraint costs.
The justification collapses under examination on two grounds.
First, hyperscale data centres do not operate flexibly. They draw at near-constant load 24 hours a day, 365 days a year. They cannot, by design, ramp up when surplus wind is available and ramp down when it is not — servers process workloads continuously; they do not hold jobs in a queue waiting for cheap electricity. The “flexible demand” rationale requires demand that is actually flexible. These facilities are not.
Second, when the wind stops blowing — as it frequently does in Scottish winters — these facilities compete directly with households for expensive dispatchable generation. A subsidy framed around absorbing cheap renewables becomes, on calm winter nights, a subsidy on gas-peaking power consumed at household expense.
Subsidising the electricity bills of the world’s richest companies while Scottish families pay record prices is not industrial strategy; it is a transfer of public wealth to private capital.
Michael Knox — Scotland’s Data Centre Reckoning, June 2026A 500MW facility running at 80% load consumes approximately 3,500 GWh per year. At £24/MWh that is £84 million per year — per facility. At 80% of that rate, still £67m.
At £84m per 500MW facility, the Scottish data centre pipeline as a whole could generate over £1 billion annually in electricity subsidies to the developers — paid ultimately through the energy bills of every household in Great Britain.
| Developer / Parent | Market Cap (approx.) |
|---|---|
| Microsoft (Azure) | ~$3.2 trillion |
| Amazon (AWS) | ~$2.0 trillion |
| Google (GCP) | ~$2.1 trillion |
| SambaNova Systems | Private — $5bn+ valuation |
| Apatura (backed by) | Global infrastructure capital |
The subsidy is available to facilities meeting the “green” data centre designation under NPF4 regardless of operator. Parent company valuations are illustrative of the wealth of the beneficiary class; exact figures vary with markets.
Section 3 — How the Money Flows
The mechanism by which household bills rise while developer costs fall is not a conspiracy — it is the ordinary operation of a regulatory charging system that was never designed for facilities of this scale arriving in a pipeline of this size. Understanding the flow is the first step to reversing it.
A 500MW facility requires a dedicated substation and reinforced transmission infrastructure. The connection application triggers an assessment by National Grid ESO and the local distribution network operator.
Some costs are borne directly by the developer (shallow connection costs). The majority — new transmission lines, substation upgrades, balancing service procurement — are allocated to the wider system and recovered through TNUoS and DUoS charges.
Ofgem sets the charging methodology. TNUoS and DUoS charges are recovered from every electricity supplier, who passes them through to every consumer. Scottish households pay a geographically weighted share of transmission costs — typically higher than GB average due to transmission distance.
Under the DSIT proposal, the same developer whose infrastructure costs are being socialised across household bills also receives a £24/MWh reduction in their electricity costs — an additional transfer funded through the same charging system.
Revenue generated by the facility flows to a parent company domiciled outside Scotland and, in most cases, outside the UK. The subsidy transfers public value to private capital with no mechanism for return.
The Scottish Energy Compact reverses this flow through two mechanisms, both within devolved planning powers:
COMPACT CONDITION 1 — FIRM POWER
Every facility above 200MW must demonstrate, before consent, a contracted pathway to firm, dispatchable power supply for 100% of its maximum demand at full cost-reflective grid charges. No grid reinforcement, capacity market, or balancing costs triggered by the facility may be socialised onto the wider consumer base. The developer bears the infrastructure cost. Households do not.
COMPACT CONDITION 2 — COMMUNITY LEVY
A mandatory £15/MWh levy on electricity consumed, paid into a ring-fenced Community Energy Fund administered by the relevant local authority and applied exclusively to energy efficiency, insulation, and bill relief for residential properties in the area. For a 500MW site: £52.5 million per year. The UK Government pays the same developer £84 million per year through the £24/MWh DSIT subsidy — funded by those same households. Condition 2 requires the developer to return £52.5 million of it to the communities hosting them.
IMMEDIATE DEMAND — WITHDRAW THE SUBSIDY
The Scottish Government should formally and publicly oppose the DSIT £24/MWh electricity discount and refuse to facilitate the scheme in Scotland. This requires no legislation. It requires a ministerial statement.
Sources: Ofgem TNUoS/DUoS methodology; National Grid ESO NOA 2024/25; DESNZ Capacity Market settlement data; DSIT data centre investment announcement, November 2025; NPF4 (2023).
Section 4 — Infrastructure Risk
The data centre buildings themselves emit non-ionising electromagnetic fields at levels international guidelines consider safe. The legitimate concern is the infrastructure required to connect them: new high-voltage substations, overhead transmission lines, and underground cable corridors placed near homes, schools and hospitals.
A 500MW facility connects to the grid at 275kV or 400kV. Standard 400kV towers stand approximately 56 metres and are spaced at 370-metre intervals. The on-site substation occupies 2 to 6 hectares. Published measured data shows magnetic field levels of 5–10 µT directly beneath a 400kV conductor, falling to approximately 0.2 µT at 120 metres. The IARC Group 2B classification of ELF magnetic fields — based on an observed association with childhood leukaemia in residential exposure above 0.3–0.4 µT — means that on published field decay data, levels from a 400kV line exceed the IARC epidemiological threshold out to approximately 60–80 metres from the conductor.
The 2009 UK Government decision not to mandate buffer zones was a cost-benefit judgement about the existing network — not a ruling that new infrastructure consented through planning cannot be subject to setback requirements. No cumulative infrastructure assessment has been published for the Scottish pipeline. Not one application has been required to model field contours relative to residential properties.
An independent cumulative impact assessment of all grid connection infrastructure must be completed before consent is determined, with modelled field contours at 50, 100, and 200 metres from all above-ground infrastructure. A minimum 100-metre planning setback shall apply between any new 275kV or 400kV overhead transmission conductor or substation perimeter fence and the nearest residential property, school, or hospital. This is a planning protection grounded in published field decay data — not a health standard. At 100 metres, measured field levels from 400kV infrastructure approach background. Full public consultation on grid connection routes and substation siting before consent is determined.
Field decay data: emfs.info/sources/overhead/specific/400-kv/; BfS bfs.de/EN/topics/emf/expansion-grid/basics/fieldstrain — IARC Group 2B: IARC Monograph 80, 2002, publications.iarc.fr — SAGE Second Interim Assessment 2010: energynetworks.org/publications — Government response: Written Ministerial Statement Oct 2009, gov.uk; NPS EN-5
Not one application in the current pipeline has published a grid connection route environmental assessment. Not one has disclosed the substation footprint and exclusion zone relative to the nearest residential properties. Not one has been required to do so as a condition of the planning process.