Quick answer: The PPN 06/21 requirement for Carbon Reduction Plans was designed to drive genuine emissions reduction through public procurement, not to generate a folder of PDFs. Buyers who treat it as a tick-box exercise are wasting the policy's potential and, frankly, their own time.
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How we got here
Cast your mind back to 2021. The Cabinet Office published PPN 06/21, requiring suppliers bidding for central government contracts above £5 million to submit a Carbon Reduction Plan — a document demonstrating a commitment to achieving Net Zero by 2050 and showing current emissions data across Scopes 1 and 2.
The intent was clear enough: use the purchasing power of the public sector to push supplier decarbonisation up the agenda. At the time, it felt like a genuine step forward. And in some organisations, it has been.
But in too many procurement teams, what actually happened was this: the requirement got bolted onto the pre-qualification questionnaire, somebody in procurement checked that a document existed, and the whole thing was filed. Job done. Next.
That is not what Net Zero looks like.
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What a Carbon Reduction Plan is actually supposed to do
A credible Carbon Reduction Plan should tell you three things. Where a supplier is now in terms of emissions. What specific actions they are taking to reduce those emissions. And how they are tracking progress over time.
It is not a policy statement. It is not a values page from a website reformatted as a PDF. It is a live, evolving document that should change year on year as the supplier makes measurable progress.
If you are receiving the same Carbon Reduction Plan from a supplier in 2025 that they submitted in 2022 — with no updates, no new baseline data, no evidence of actions taken — that is a problem. Either the supplier has done nothing, or they do not understand what the requirement is for. Possibly both.
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The evaluation gap
Here is where procurement teams have largely let the side down.
Most organisations have been collecting these documents without evaluating them in any meaningful way. Partly because the original PPN set a pass/fail threshold rather than a scored quality assessment. Partly because few procurement teams have the technical confidence to interrogate a Scope 1 and 2 emissions baseline or challenge a supplier's methodology.
But "I don't know enough about carbon accounting to score this" is not a sufficient reason to abandon the policy. It is a reason to build capability, use specialist support, or bring in evaluation criteria that any experienced evaluator can apply consistently.
At a minimum, you should be checking: Is the baseline recent? Are the emission categories completed, not left blank? Are the stated actions specific and time-bound? Is there any third-party verification? Does the document reference the supplier's actual business, or does it feel like something downloaded from a template library?
None of that requires a climate scientist.
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What good looks like
The buyers I have seen handle this well share a few common habits.
They brief suppliers at market engagement stage, not just at PQQ. They explain what a strong Carbon Reduction Plan looks like, point suppliers to the BEIS guidance, and make clear that the document will actually be read.
They build in a review mechanism at contract stage — a point, typically annually, where the supplier's progress against their plan is discussed. Not audited in a heavy-handed way, but reviewed. Asked about. Made visible.
And they connect the Carbon Reduction Plan to the broader contract conversation, alongside social value commitments and KPIs. Because a supplier who knows their environmental commitments will be revisited during the contract life behaves differently from one who submitted a document and never heard about it again.
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The Procurement Act context
The Procurement Act 2023 does not directly replicate PPN 06/21, but it does embed sustainability more firmly into the overall framework — in the way contracting authorities must consider national priorities, in how the social value regime sits alongside procurement objectives, and in the broader expectation of transparency and proportionality.
The direction of travel is not reversing. If anything, expectations on buyers to demonstrate genuine engagement with net zero — not just receipt of documents — will increase.
Suppliers developing their Carbon Reduction Plans, particularly SMEs who may be doing this for the first time, need buyers who can give them intelligent feedback, not just a pass mark.
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The practical takeaway
Go and pull the last ten Carbon Reduction Plans your organisation received. Ask yourself honestly: were they evaluated, or were they accepted? If you cannot answer that question with confidence, you have found your starting point.
Collecting these documents was never the goal. Driving down emissions across your supply chain was. Those are different things, and it is worth being clear about which one your current process is actually achieving.