Buried in the detail of most commercial energy bills is a line for the Climate Change Levy. For many finance teams it is often accepted as another unavoidable charge - a government tax on energy, paid without much scrutiny.

The Climate Change Levy is a significant cost for energy-intensive businesses, and the rules governing who pays it, at what rate, and who qualifies for relief are complex enough that errors are common. This emphasises the importance of investigating the charge before accepting it. Some businesses pay the full rate when they are entitled to substantial reductions. Others have relief in place that has lapsed without anyone noticing. In our audit work, incorrectly applied CCL is one of the more frequent - and more recoverable - billing errors we find.

This guide explains what the Climate Change Levy is, how it is charged, the main reliefs and exemptions available, and how to check whether your business is paying more than it should.

What the Climate Change Levy is

The Climate Change Levy (CCL) is a UK government tax on energy used by businesses and the public sector. It was introduced in 2001 to encourage energy efficiency and reduce emissions, and it applies to electricity, gas, and solid fuels supplied for non-domestic use.

CCL is charged per unit of energy consumed - a rate per kilowatt hour for electricity and gas - and appears as a separate line item on business energy bills. It is collected by energy suppliers and passed to HMRC.

The rate is set by government and reviewed periodically. It applies on top of the wholesale cost of energy and the various network and policy charges, which means for energy-intensive businesses it adds a meaningful amount to the total bill.

Crucially, CCL is not charged uniformly. There are two categories where the amount payable changes significantly: the main rates that most businesses pay, and the reduced rates and exemptions available to businesses that qualify. Understanding which category you fall into has a financial repercussion.

Who pays CCL, and who does not

CCL applies to most business and public sector energy consumption, but there are important exclusions:

• Domestic and charitable use is excluded. Energy supplied for domestic use, or for non-business use by a charity, is not subject to CCL.
• Small-scale use below certain thresholds (the de minimis limits) is treated as domestic and excluded.
• Certain forms of transport and specific industrial processes may be excluded or relieved.

For the majority of commercial organisations, though, CCL applies to their electricity and gas consumption at the main rates - unless they qualify for one of the reliefs described below.

Climate Change Agreements (CCAs)

The most significant CCL relief is available through Climate Change Agreements (CCAs).

A CCA is a voluntary agreement between an energy-intensive business and the Environment Agency. In exchange for meeting energy efficiency or carbon reduction targets, the business receives a substantial reduction in CCL - currently 92% on electricity and 89% on gas (from April 2026), though the precise figures are set by government and reviewed over time.

CCAs are available to businesses in eligible energy-intensive sectors - a defined list that includes manufacturing sectors such as food and drink, chemicals, paper, ceramics, and many others. Businesses operate under a sector umbrella agreement and commit to targets assessed over two-year periods.

The saving for an eligible business can be considerable. But CCAs require active management: targets must be met, performance must be reported, and the relief must be correctly applied by the energy supplier. Two common failures cost businesses money - a CCA that lapses at a renewal point without being resubmitted, and a valid CCA where the relief certificate has not been correctly applied to the energy account by the supplier. Both result in the business paying full-rate CCL when it should be paying the reduced rate.

Mineralogical and Metallurgical exemptions

A second, frequently overlooked route to CCL relief is the Mineralogical and Metallurgical (Min/Met) exemption.

Many businesses assume CCL relief is only available through a CCA. It is not. Energy used in certain mineralogical and metallurgical processes is fully exempt from CCL, and this exemption is often missed because eligibility is based on the industrial process being carried out, not simply the sector the business sits in.

Qualifying mineralogical activities include the manufacture of glass and glass products, ceramics, bricks, tiles and refractory products, cement, lime, plaster and concrete, and stone cutting and finishing.

Qualifying metallurgical activities include the manufacture of iron, steel and other basic metals, non-ferrous metal production, metal casting and foundry operations, forging, pressing and stamping, and surface treatment and coating processes.

Because eligibility turns on the process rather than the sector, a business may carry out both qualifying and non-qualifying activities on the same site, in which case only a proportion of its energy use is exempt. Establishing eligibility and the correct proportion requires a specialist assessment - but where it applies, the exemption removes CCL entirely from the qualifying energy use.

Renewable and other reliefs

Beyond CCAs and Min/Met exemptions, there are other circumstances that affect CCL:

• Good quality CHP (combined heat and power) output can qualify for relief in certain circumstances.
• Energy used to produce electricity may be relieved to avoid double charging.
• Businesses below the de minimis thresholds may fall outside CCL for the relevant supply.

The rules are specific so the detail is important for businesses to understand. The practical point is that CCL is not a flat, unavoidable charge for every business - there are several routes to relief, and the eligibility criteria are technical enough that many businesses do not realise they qualify.

Where CCL goes wrong on bills

In practice, CCL errors fall into a few recurring patterns:

• Full rate applied where a CCA reduction should apply - typically because the relief certificate was not correctly registered against the account, or lapsed at a renewal point.
• Min/Met exemption not claimed - because the business, or its supplier, did not recognise that the process qualified.
• CCL charged on exempt or de minimis supplies - where domestic-equivalent or small-scale use has been incorrectly treated as fully chargeable.
• Errors persisting after supplier switches - where relief in place with a previous supplier did not carry over cleanly to the new one.

Because CCL is a per-unit charge applied continuously, these errors compound over time and, unlike some billing errors, CCL overpayments are recoverable. The recovery period for CCL claims is typically limited to four years though, so the sooner an error is identified, the more can be reclaimed.

How to check your CCL is correct

The practical questions for any finance team or energy manager:

• Are we in an energy-intensive sector that could qualify for a CCA?
• If we have a CCA, is the relief actually being applied on our bills, and is the agreement current?
• Do any of our processes qualify for a Mineralogical or Metallurgical exemption?
• Has our CCL treatment been checked since our last supplier switch?
• Has anyone ever independently reviewed our CCL charges?

If the honest answer to that last question is no, there is a reasonable chance CCL is being charged incorrectly. A specialist CCL review establishes eligibility, corrects the ongoing charge, and recovers overpayments within the four-year window.

The bottom line

The Climate Change Levy is far from a fixed, unavoidable cost. Between Climate Change Agreements, Mineralogical and Metallurgical exemptions, and the various other reliefs, many energy-intensive businesses are entitled to significant reductions - and a meaningful number are either not claiming them or are being charged incorrectly despite being eligible.

The only way to know is to look. Given that overpayments are recoverable for up to four years, checking is almost always worthwhile for any business with significant energy consumption.

Think you might be paying too much Climate Change Levy?

Request a review. Our specialists will assess your eligibility for CCL relief and exemptions, correct any errors, and recover overpayments where they exist - at no upfront cost.

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