Scorecard: Net Zero environmental levies on electricity bills
Status: Published Version: 1.0 Data date: 2025-04-01 Maintainer: @nstate-project Evidence quality (overall): HIGH
A. Policy definition
| Field | Detail |
|---|---|
| Official name | Environmental and social levies on electricity (Renewables Obligation, Feed-in Tariff, Contracts for Difference, Energy Company Obligation, Warm Homes Discount) |
| Implementation date | RO: 2002; FiT: 2010; CfD: 2014; ECO: 2013; WHD: 2011 |
| Jurisdiction | UK-wide (WHD: GB) |
| Stated government objective | Fund the transition to low-carbon generation; support vulnerable households with energy costs |
| Target population | All electricity consumers; low-income households (WHD/ECO) |
| Scale | ~£9–10bn/year collected via electricity bills (pre-2025 Budget reforms) — Source: Ofgem/UKERC |
B. Observed data
| Metric | Value | Source | Data date |
|---|---|---|---|
| Renewables Obligation cost per household | £94/year | Ofgem ROC redistribution data | 2024–25 |
| Feed-in Tariff cost per household | £21/year | UK Parliament briefing | 2024 |
| Energy Company Obligation cost per household | £25/year | UK Parliament briefing | 2024 |
| Warm Homes Discount cost per household | £12/year | UK Parliament briefing | 2024 |
| Total environmental/social levies per household | ~£156/year (9% of bill) | UKERC/Nesta analysis | 2025 |
| Levies as % of Ofgem price cap (pre-2025 Budget) | 17% | UKERC price cap breakdown | 2024 |
| ROC buy-out price 2024–25 | £64.73 per ROC | Ofgem | 2024 |
| UK residential electricity price rank (IEA) | 2nd highest among IEA members | UKERC/Turver analysis | 2024 |
| Post-2025 Budget levy share of price cap | Nesta | 2025 |
International comparison:
| Country | Residential electricity price (€/kWh) | Policy levy share | Source |
|---|---|---|---|
| UK | ~0.31 | ~17% (pre-2025) | UKERC 2024 |
| Germany | ~0.38 | ~26% | IEA 2024 |
| France | ~0.22 | ~14% | IEA 2024 |
| EU average | ~0.27 | ~18% | IEA 2024 |
Note: Direct cross-country levy comparison is methodologically difficult; network cost structures differ significantly.
C. Counterfactual
Method used: Direct accounting (levy obligations are defined in regulation and published by Ofgem)
Baseline: An electricity bill without the defined levies — i.e., what a household would pay if environmental and social obligations were funded through general taxation instead.
Key assumptions:
- Wholesale electricity prices unchanged (levy removal does not alter generation mix in the short run)
- No behavioural response from consumers or generators
- Government would need to fund equivalent support (WHD, ECO) via other means if levies removed
Central estimate: Removing all environmental and social electricity levies would reduce the average household electricity bill by approximately £152–160/year at 2024–25 rates.
Sensitivity range: Low: £120/year (if some levy costs already absorbed by suppliers) | Central: £156/year | High: £200/year (if indirect costs via industrial pass-through included)
Confidence in counterfactual: HIGH for direct levy accounting; LOW for second-order effects on wholesale prices and generation investment.
D. Impact dimensions
| Dimension | Metric | Value | Evidence quality | Source |
|---|---|---|---|---|
| Exchequer impact | Annual revenue raised via levies | ~£9–10bn/year | HIGH | Ofgem/UKERC 2024 |
| Household impact | Annual levy cost per household | ~£156/year | HIGH | UKERC/UK Parliament 2024–25 |
| Distributional | Share of income (lowest decile vs average) | Regressive: energy costs are ~10% of lowest-decile income vs ~3% average | MEDIUM | Full Fact / CCC analysis |
| Competitiveness | UK industrial electricity price vs EU peers | UK industrial prices among highest in Europe, partly driven by policy costs | MEDIUM | UKERC 2025 |
| Delivery / output | Renewable generation share of UK electricity | 44% in 2023, rising to 50%+ in 2024 | HIGH | National Grid ESO |
| Transition cost | CCC estimate of rebalancing levy to gas bills | Would save households £250–500/year on electricity by 2030 | MEDIUM | CCC 2025 |
| 2025 Budget reform | ECO scrapped, some RO costs moved to taxation | Bill reduction of ~£60–100/year in 2025 | MEDIUM | HM Treasury / Nesta 2025 |
E. Evidence quality
| Dimension | Rating | Reason |
|---|---|---|
| Data availability | HIGH | Ofgem publishes ROC buy-out prices, levy weights, and obligation levels annually |
| Causal attribution | HIGH | Levies are defined regulatory obligations — their cost is directly calculable, not estimated |
| Counterfactual quality | MEDIUM | Assumes no wholesale market response; long-run effects of removing levies on investment are uncertain |
| International comparability | MEDIUM | Methodological differences between countries make exact price comparisons difficult |
Overall rating: HIGH
G. Verdict
Fiscal score: Positive (revenue raised exceeds admin cost; ~£9–10bn/year collected) Economic score: Negative (regressive household cost; UK competitive position weakened relative to lower-levy peers) Delivery score: Partially achieved (renewable share rising strongly; but levy burden higher than necessary given CCC proposals to rebalance to gas)
Bottom line:
Environmental and social levies added approximately £156/year (17% of the price cap) to the average UK household electricity bill in 2024–25, making UK residential electricity prices the second highest among IEA members. The Renewables Obligation alone cost households £94/year. The 2025 Budget partially addressed this by shifting some costs to general taxation, reducing the levy share to ~9%. The underlying data is high quality — Ofgem publishes the levy obligations directly — but debate continues over whether funding the energy transition through electricity bills rather than general taxation represents an optimal or fair policy design.
Sources
| # | Title | Institution | URL | Data date |
|---|---|---|---|---|
| 1 | Renewables Obligation: Total Obligation for 2024 to 2025 | Ofgem | https://www.ofgem.gov.uk/check-if-energy-price-cap-affects-you | 2024 |
| 2 | What costs make up an electricity bill? | UK Parliament Research Briefing | https://commonslibrary.parliament.uk | 2024 |
| 3 | The Price of Power: Policy Cost Formation in UK Electricity | UKERC | https://ukerc.ac.uk | 2025 |
| 4 | Rebalancing energy levies | Nesta | https://nesta.org.uk | 2025 |
| 5 | Policy brief: Levy rebalancing and heat pump adoption | Smith School of Enterprise and the Environment, Oxford | https://www.smithschool.ox.ac.uk | 2025 |
| 6 | Net Zero policy costs: fact check | Full Fact | https://fullfact.org | 2025 |
| 7 | Sixth Carbon Budget — funding mechanisms | Climate Change Committee | https://www.theccc.org.uk | 2025 |
| 8 | IEA Energy Prices 2024 | International Energy Agency | https://www.iea.org/data-and-statistics/data-product/energy-prices | 2024 |
Revision history
| Version | Date | Change |
|---|---|---|
| 1.0 | 2026-08-20 | Initial publication |