The Climate Change Levy is one of those charges that most businesses pay without thinking about it. It sits on your energy bill alongside the unit rate, standing charge, and VAT — just another line item you glance at and move on.
But CCL errors are more common than you'd expect. And when they happen, the overcharge can run for months or years before anyone notices.
What is the Climate Change Levy?
The CCL is an environmental tax on the commercial use of energy. It was introduced in 2001 to encourage businesses to improve energy efficiency and reduce carbon emissions. It applies to electricity, gas, LPG, and solid fuels used by businesses, public sector organisations, and other non-domestic consumers.
Current CCL rates (2026/27):
- Electricity: 0.775p per kWh
- Natural gas: 0.672p per kWh
- LPG: 2.175p per kg
- Solid fuels: varies
These rates change annually in April. They're set by HM Treasury, not Ofgem or the energy suppliers — though it's the supplier who applies the charge to your bill and remits it to HMRC.
Who is exempt from CCL?
Not everyone pays CCL. Several categories of organisation are fully or partially exempt:
Full exemptions:
- Charities and not-for-profit organisations (for non-business use)
- Domestic consumers (but if your business operates from a domestic property on a commercial meter, you do pay)
- Very small businesses using a trivially small amount of energy (the de minimis threshold)
- Energy used in certain transport applications
- Renewable source electricity supplied under specific conditions
Partial exemptions via Climate Change Agreements (CCAs):
- Energy-intensive industries that have signed a CCA with the Environment Agency get a reduced CCL rate — currently 92% reduction for electricity and 83% for gas
- These agreements require the business to meet energy efficiency targets in return for the discount
CCL reduction certificates:
- Businesses buying electricity from renewable sources may receive Levy Exemption Certificates (LECs) that exempt that electricity from CCL
- Combined Heat and Power (CHP) stations can issue CCL exemption certificates for qualifying good quality CHP output
The most common CCL errors
1. Exempt organisations being charged CCL
This is the most frequent and most expensive error. A charity qualifies for CCL exemption but the supplier's billing system has them on a standard tariff with CCL included.
How does this happen? Usually during a contract renewal or supplier switch. The exemption was registered with the old supplier but not carried across to the new one. Or the charity signed up through a broker who didn't flag the exemption status.
On a charity using 200,000 kWh of electricity per year, the overcharge is £1,550 per year — just on CCL.
2. Wrong CCL rate applied
The CCL rate changes every April. If the supplier's system doesn't update the rate on the correct date, you'll be charged the old rate (if it went up, you're underpaying; if it went down, you're overpaying). We've seen cases where the old rate persisted for two or three quarters before the correction came through.
3. CCA discount not applied
Businesses with Climate Change Agreements are entitled to a significant CCL reduction. But the discount requires an active PP11 form (the certificate that proves CCA eligibility) to be registered with the supplier. If the PP11 lapses, expires, or isn't submitted after a supplier switch, the full CCL rate kicks in.
For an energy-intensive manufacturer using 5,000,000 kWh of electricity per year, losing the 92% CCA discount means paying the full 0.775p/kWh instead of the reduced rate. That's a difference of approximately £35,650 per year.
4. CCL charged on exempt renewable electricity
If your supplier provides electricity backed by Levy Exemption Certificates from qualifying renewable sources, that electricity should be exempt from CCL. If the LECs aren't properly attributed to your supply, you get charged CCL anyway.
How to check CCL on your bills
Step 1: Confirm your CCL status. Are you exempt? Do you have a CCA? Do you buy renewable electricity with LECs? If you don't know, check with your finance team, your energy manager, or your broker.
Step 2: Check the rate. Look at the CCL line on your bill. The rate should match the current HMRC-published rate for the financial year. If it's an old rate, flag it.
Step 3: Check the maths. Multiply your billed consumption by the CCL rate. The result should match the CCL charge on your bill. If it doesn't, something is off — either the rate is wrong, or the consumption figure being used for the CCL calculation doesn't match the metered consumption.
Step 4: Check your PP11 (if applicable). If you have a CCA, verify that your PP11 certificate is current and registered with your supplier. PP11s need to be renewed — they don't last forever.
Step 5: Check LECs (if applicable). If your contract includes renewable electricity exempt from CCL, check that the exemption is being applied to the correct volume of consumption.
How to recover CCL overcharges
If you've been charged CCL incorrectly, you can claim a refund from your supplier. The process:
- Write to your supplier with the specific billing periods affected, the charge applied, and the charge that should have been applied
- Provide evidence of your exemption (charity registration, PP11 certificate, LEC documentation)
- The supplier should issue a credit note for the overcharged periods
For charities, HMRC allows claims going back up to four years. For CCA businesses, the claim period depends on when the PP11 lapsed.
Why automated checking matters here
CCL errors are particularly well-suited to automated validation because the checks are rule-based. The software knows your CCL status, knows the current rate, and can verify every bill against those parameters instantly. No judgement calls. No manual lookups.
For brokers managing a portfolio with a mix of standard businesses, charities, CCA holders, and renewable contracts, manual CCL checking is a headache. Automated validation handles it in the background.
If you're managing client bills and want to make sure CCL is being applied correctly across your portfolio, see how it works for the full validation workflow. For a broader look at what else goes wrong on energy bills, our guide to the most common energy billing errors in the UK covers the full range.
Ready to validate CCL — and everything else — automatically? Try Edge free.