England UK ETS Lime Benchmark Changes for 2027

One of those tiny legal orders that most people would never read has just changed a real part of UK climate policy. According to the text published by legislation.gov.uk, the Greenhouse Gas Emissions Trading Scheme (Lime Benchmark) (England) Order 2026 was made on 29 May 2026, laid before Parliament on 2 June 2026 and comes into force on 24 June 2026. If that sounds dense, the plain-English version is simple. For the 2027 scheme year, the benchmark used to calculate free UK ETS allowances for certain lime installations in England will be raised from 0.725 to 0.798.

To see why that matters, it helps to step back. The explanatory note says the UK Emissions Trading Scheme, or UK ETS, is the system that requires certain industrial installations to monitor their greenhouse gas emissions, submit verified reports and hand over allowances to match those emissions each year. Those allowances can be traded, and the total number that can be created is capped. The scheme runs across ten scheme years. The note says it is split into the 2021-2025 allocation period, a standalone 2026 scheme year, and the 2027-2030 allocation period. So this Order is not about the whole system being rewritten; it is about one calculation inside the next allocation period.

Some operators do not have to buy every allowance at auction. Under the UK ETS, some installations receive a number of allowances free of charge, known as free allocation. That number is partly worked out using sector benchmarks. The note explains a benchmark as a measure of average emissions intensity per unit of product among the most efficient installations in a sector. In everyday terms, it is a reference number the scheme uses when it estimates how many free allowances a plant should get. If that benchmark goes up, the preliminary free allocation for the same output is also higher, all else being equal.

This Order tells us exactly which number is changing. For calculations of the preliminary annual number of allowances for the 2027 scheme year, the Free Allocation Regulation must be read as though the lime product benchmark in Annex 8 were 0.798 instead of 0.725. It applies to incumbent installations located in England. In other words, this is aimed at existing installations covered by that part of the scheme, not a blanket change across every industry and every place in the UK.

There is also a legal detail worth noticing. The Order extends to England and Wales, but the change it makes is for qualifying installations located in England. That is a good example of how legal extent and practical effect are not always the same thing. The Order also records the process behind the decision. Before making it, the Secretary of State obtained and took account of advice from the Committee on Climate Change and consulted people the department considered likely to be affected. It was signed by Chris McDonald, Parliamentary Under-Secretary of State at the Department for Energy Security and Net Zero, on 29 May 2026.

What does this mean in practice? For the lime benchmark only, the 2027 free-allocation calculation becomes more generous than it would have been under the old 0.725 figure. That does not remove the need to monitor emissions, file verified reports or surrender allowances. It changes one important input into the maths. Just as importantly, the rest of the UK ETS still stands. The cap on allowances remains. Auctions remain. Trading remains. The obligation on covered operators to match allowances to emissions remains. This is a targeted amendment, not a replacement for the scheme.

If you are learning how to read legislation, this is a useful example. We can ask four simple questions: what changed, who is affected, when does it start, and what stays the same. Here, one benchmark number changed, it affects certain existing lime installations in England, it starts on 24 June 2026, and the wider UK ETS structure stays in place. That may sound small, but small numbers in climate law can shape real costs and real incentives. Sometimes the most important policy stories are not dramatic speeches. They are short statutory instruments that quietly alter how the rules work.