Tax Planning
How the New Electricity Generator Levy Increase Could Impact Renewable Energy Businesses
An increase in the UK’s Electricity Generator Levy (EGL) from 45% to 55% starts 1 July 2026—here’s what businesses need to know and how to prepare.
By NomadicTax Research Team • 5-8 min read • May 17, 2026
## What is the Electricity Generator Levy (EGL)?
The EGL is a tax on **“exceptional electricity generation receipts”** from qualifying generators (renewable, nuclear, biomass) when the **sale price** of electricity exceeds a benchmark linked to gas prices. It’s meant to claw back surplus profits from generators benefiting from volatile electricity pricing. ([gov.uk](https://www.gov.uk/government/publications/electricity-generator-levy/?utm_source=openai))
## The Change & When It Takes Effect
Starting **1 July 2026**, the rate applied under EGL will increase from **45% to 55%**, affecting receipts from the commencement of that date. If a corporation’s accounting period straddles the change, receipts will be apportioned accordingly. ([gov.uk](https://www.gov.uk/government/publications/electricity-generator-levy-technical-note--2/electricity-generator-levy-rate-increase-from-1-july-2026?utm_source=openai)) The duration of the levy is also being extended beyond its original end date in **April 2028**. ([kpmg.com](https://kpmg.com/uk/en/insights/tax/tmd-other-news-in-brief-30-04-2026.html?utm_source=openai))
## Who Is Affected?
- Generators using low-carbon tech like solar, wind, nuclear, that **don’t have fixed-price contracts** and thus benefit when gas prices spike. ([gov.uk](https://www.gov.uk/government/news/decisive-action-to-break-influence-of-gas-on-electricity-prices?utm_source=openai))
- Large operators with accounting periods spanning 1 July 2026—part of their receipts may be apportioned to the higher rate. ([gov.uk](https://www.gov.uk/government/publications/electricity-generator-levy-technical-note--2/electricity-generator-levy-rate-increase-from-1-july-2026?utm_source=openai))
## Implications & Planning Strategies
| Challenge | What That Means | Possible Action |
|---|---|---|
| Rise in tax charge | Margins will be squeezed for those exposed to volatile electricity pricing | Assess exposure risk: fixed vs floating price contracts |
| IRS accounting complexity (accounting period split) | You’ll need to apportion receipts appropriately across the old and new rates | Update accounting systems/software to reflect split-rate apportionment correctly |
| Cash flow impact | Higher prepaid taxes in advance or quarterly instalments due | Reforecast cash flows and possibly negotiate payment terms with financiers |
## Example Scenario
Suppose **WindCo Ltd**, a wind farm operator with a year-end at 30 September. From 1 January to 30 June 2026, they earn receipts of £10 million-above benchmark; from 1 July to 30 September, another £5 million. Under EGL:
- Jan-Jun receipts taxed at **45%** → £10m × 45% = £4.5m EGL tax liability
- Jul-Sep receipts taxed at **55%** → £5m × 55% = £2.75m EGL tax liability
- **Total EGL tax liability** = **£7.25m** for the full accounting period.
Prior behavior (if all receipts were under one rate) would have resulted in £6.75m. So incremental liability of £0.5m just due to the rate change.
## Key Takeaways & Practical Advice
- If possible, move existing power contracts to **fixed-price long-term contracts**—some of which the government is making available. ([gov.uk](https://www.gov.uk/government/news/decisive-action-to-break-influence-of-gas-on-electricity-prices?utm_source=openai))
- **Budget contingencies**: build in the increased tax liability into forecasts or cash reserves if you expect carry-over into the new rate.
- **Tax advice**: consult a tax expert to ensure that your financial statements and tax calculations properly apportion receipts when accounting periods cross 1 July 2026.
- **Fixed-price contracts offered by the government** may benefit those generators not yet tied in—explore whether you qualify. ([gov.uk](https://www.gov.uk/government/news/decisive-action-to-break-influence-of-gas-on-electricity-prices?utm_source=openai))
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## Final Thoughts
This EGL hike reflects government urgency to shift the burden of electricity inflation away from consumers and onto generators enjoying outsized revenues. For renewables businesses, understanding the new rate, apportionment rules, and contract structure will be essential in protecting margins and complying accurately. With proactive planning, you can adapt to the change without major surprise liabilities