Carbon Reporting Mistakes That Cost UK Businesses Government Contracts

Winning public sector contracts is competitive enough without disqualifying yourself before the evaluation even starts. Yet that is exactly what happens to UK businesses that submit a Carbon Reduction Plan that does not meet the requirements of PPN 006 - the UK government's procurement policy on supplier carbon reporting.

These are not obscure technicalities. They are straightforward requirements that procurement teams check against a clear checklist. The good news is that every mistake below is avoidable, and fixing them before you bid costs far less than losing the contract.

What PPN 006 Actually Requires

Before listing the mistakes, it is worth being precise about what the policy demands. PPN 006 (formally PPN 06/21) applies to contracts above approximately £5 million per year. Suppliers must submit a Carbon Reduction Plan that:

• Reports Scope 1, Scope 2, and a minimum set of Scope 3 emissions categories
• Commits to achieving net zero by 2050 at the latest
• Is published publicly on the supplier's own website
• Is signed off by a director or equivalent senior responsible individual
• Uses UK Government conversion factors (DEFRA/DESNZ) for emissions calculations

Most rejections happen because one of these five elements is missing or done incorrectly.

Mistake 1: Only Reporting Scope 1 and 2 Emissions

Scope 1 covers direct emissions from sources you own or control - fuel burned in your vehicles and on-site equipment. Scope 2 covers purchased electricity and heat. Together they are the easy part. Most SMEs can calculate them in an afternoon.

The common mistake is stopping there. PPN 006 requires Scope 3 reporting across a defined set of categories, which includes business travel, employee commuting, and waste disposal as a minimum. Submitting a CRP that omits Scope 3 entirely is a disqualifying error - procurement officers are trained to spot it.

If Scope 3 data is difficult to gather, the correct approach is to report what you have, note the methodology used, and explain any gaps. An honest partial disclosure is far better than a missing section.

Mistake 2: No Reduction Targets - Just Current Emissions

A Carbon Reduction Plan is not an emissions inventory. Listing your current carbon footprint without committing to specific, time-bound reductions misses the point of the policy entirely.

Your CRP must include a net zero commitment by 2050 at the latest, plus interim targets that show a credible pathway to get there. Many businesses include a 2030 target - for example, reducing Scope 1 and 2 emissions by 50% against a 2023 baseline. Procurement teams want to see milestones, not just good intentions.

Mistake 3: Using Outdated or Incorrect Emissions Factors

Emissions factors convert activity data - litres of diesel, kilowatt-hours of electricity, kilometres travelled - into tonnes of CO2 equivalent. The UK Government publishes updated factors annually through DEFRA and the Department for Energy Security and Net Zero.

Using last year's factors is a common error, particularly for grid electricity, where the carbon intensity of the UK grid changes every year as renewable generation increases. Using commercially produced factors or factors from another country's government is also a problem. Your calculations must use the current official UK Government conversion factors to be compliant.

Mistake 4: The CRP Is Not Published on Your Website

This is one of the most frequently failed checks - and one of the most avoidable. PPN 006 requires that your Carbon Reduction Plan is publicly accessible on your own company website before you submit it as part of a tender.

A document attached to the tender response is not sufficient. Procurement officers will visit your website to verify the plan is there. If it is not, or if it is hidden behind a login, the submission fails. The plan should be findable from your homepage or a clearly labelled sustainability section.

Mistake 5: No Director Sign-Off

Your Carbon Reduction Plan must be signed by a director or a senior officer with equivalent authority. The signature demonstrates board-level commitment to the targets - which is part of what the policy is trying to test.

A plan that lists targets without a named signatory, or that is signed by a sustainability manager rather than a director, does not meet the requirement. If your business has a single director, that person signs it. If you have a board, the sign-off should come from the CEO, Managing Director, or a director with explicit board authority.

Mistake 6: Changing Your Baseline Year Without Explanation

Your baseline year is the reference point against which all future reductions are measured. Once set, it should not change without good reason - and any change must be explained and documented in the plan.

Some businesses inadvertently reset their baseline by switching the year in an updated plan, which makes their reduction targets appear more ambitious than they are. This is picked up in tender evaluation and raises questions about the reliability of the whole submission. Set a baseline year, stick to it, and document the methodology clearly.

Mistake 7: Starting at Tender Stage

A compliant Carbon Reduction Plan takes time to produce properly. You need to gather emissions data, calculate your footprint using the correct factors, set credible targets, get director sign-off, and publish the document on your website - all before the tender deadline.

Businesses that start this process when they see a contract they want to bid for often find they cannot meet the deadline. The right approach is to have your CRP in place before you begin bidding for contracts in scope of PPN 006. Treat it as a standing business credential, not a document you produce on demand.

How to Check Your Plan Before You Bid

Before submitting any tender that requires PPN 006 compliance, run through this checklist:

• Does your CRP cover Scope 1, Scope 2, and required Scope 3 categories?
• Does it include a net zero commitment by 2050 and interim reduction targets?
• Have you used the current UK Government DEFRA/DESNZ emissions factors?
• Is the plan published on your website with a stable, public URL?
• Is it signed by a director?
• Is your baseline year consistent with previous submissions?

If any of these are missing, fix them before you submit. A compliant plan that is clearly structured and honestly reported will always score better than one that has obvious gaps.

You can also use our free PPN 006 compliance checker to run through the key requirements in under two minutes, and our step-by-step Carbon Reduction Plan guide if you are building or updating your plan.