United Kingdom
Overview
| Attribute | Value |
|---|---|
| SSS Relevance | ⭐⭐⭐ High |
| Market Type | Liberalized |
| Key Clean Resources | Nuclear (14%), Wind (29.5%), Solar (5%) |
| EAC System | REGO (Renewable Energy Guarantees of Origin) |
| Grid Carbon Intensity | ~180-200 gCO2/kWh (2024) |
The United Kingdom has a mature, liberalized electricity market with significant nuclear capacity and the world's largest offshore wind fleet. In 2024, renewables generated over half of UK electricity for the first time, while coal was fully phased out of the generation mix.
SSS Relevance
⭐⭐⭐ High — The UK offers strong SSS potential due to:
- Operating nuclear fleet (5 stations, ~6 GW capacity) providing ~14% of generation
- Established REGO system for EAC tracking
- Clear residual mix calculations via Ofgem
- Post-Brexit regulatory clarity (UK operates separate from EU GO system)
SSS-Eligible Resources
| Resource Type | Capacity/Output | SSS Classification |
|---|---|---|
| Nuclear | 40.6 TWh (14.25%) | ✅ Clearly SSS — default delivered, no REGO retirement required |
| Legacy Hydro | ~2% of generation | ⚠️ Depends on RO/REGO status |
Operating Nuclear Plants:
- Sizewell B (1.2 GW, operating until ~2035)
- Heysham 1 & 2 (2.4 GW combined)
- Hartlepool (1.2 GW)
- Torness (1.2 GW)
Note: Several older AGR reactors are being decommissioned. Hinkley Point C (3.2 GW) under construction.
Market Structure
Regulator: Ofgem (Office of Gas and Electricity Markets)
Market Model: Fully liberalized retail market with wholesale competition. Customers can choose suppliers; default tariff cap applies to standard variable tariffs.
Grid Operator: National Grid ESO (Electricity System Operator)
Key Suppliers:
- British Gas, EDF Energy, E.ON UK, Scottish Power, SSE, Octopus Energy
- Many independent/challenger suppliers
Clean Energy Policy
| Policy | Status |
|---|---|
| Net Zero Target | 2050 (legally binding) |
| Power Sector Decarbonization | 2035 target for clean power |
| Coal Phase-Out | ✅ Complete (2024) |
| Nuclear Policy | Supportive — new build at Hinkley Point C, Sizewell C approved |
Renewables Obligation (RO): Legacy support scheme (closed to new generation 2017); RECs retired under RO don't contribute to SSS pool.
Contracts for Difference (CfD): Current support mechanism for new renewables; separate from SSS eligibility.
EAC Infrastructure
Primary System: REGO (Renewable Energy Guarantees of Origin)
| Attribute | Details |
|---|---|
| Registry Operator | Ofgem |
| Standard | 1 REGO = 1 MWh |
| Scope | Renewable electricity only (nuclear not covered) |
| Validity | 12 months from generation |
Fuel Mix Disclosure: UK suppliers must disclose annual fuel mix, enabling residual mix calculations for Scope 2 reporting.
Important for SSS: Nuclear generation in the UK does not receive REGOs — it flows to customers as default "brown" power in fuel mix terms, making it clearly SSS-eligible (no double-counting risk from EAC retirement).
Emissions Factors
| Source | Value | Use Case |
|---|---|---|
| UK Grid Average | ~180 gCO2/kWh (2024) | Location-based Scope 2 |
| UK Residual Mix | Published by Ofgem/suppliers | Market-based Scope 2 |
| DEFRA Conversion Factors | Updated annually | UK corporate reporting |
Data Sources
References
- RenewableUK, "Official stats show renewables generated over half UK's electricity for the first time in 2024"
- Energy Oasis, "UK Energy Mix 2024"
- Wikipedia, "Energy in the United Kingdom"