The gap between net zero ambition and market reality

Most UK businesses with a serious ESG profile now carry a net zero commitment. It appears in the annual report, in supplier questionnaires, on the website. Boards have approved it. Investors have noted it. In many cases, a third party has verified the framing.

What fewer of those same businesses carry is a supply arrangement capable of evidencing it.

That is not cynicism. It reflects something structural: the routes that deliver genuine, verifiable progress on Scope 2 emissions are not the ones most buyers end up on, and most commercial arrangements were signed before this scrutiny arrived.

Most large businesses have a net zero commitment. Fewer have a mechanism.

Corporate net zero commitments in the UK have grown sharply over the past five years, moving rapidly downstream: from listed companies to their supply chains, and from there to the industrial and commercial (I&C) sector as a whole.

The driver was not purely voluntary. Scope 3 reporting requirements under the GHG Protocol mean a large business's emissions profile now includes its suppliers' operations - so when a major retailer or manufacturer asks for emissions data, the question flows straight to facilities-level energy consumption.

What that pressure produced was often a commitment - a stated target, a date, a headline figure - but not a supply structure designed to support the claim.

A green tariff is not the same as evidenced renewable supply

The UK retail energy market offers green tariffs, and most large suppliers include one. A business signs a renewal, ticks the renewable box, and receives a certificate confirming its electricity was matched to renewable generation.

That certificate is typically a Renewable Energy Guarantee of Origin (REGO), issued by Ofgem to generators for each megawatt-hour of eligible renewable electricity produced. Suppliers buy REGOs separately from the electricity itself and retire them against customer consumption to substantiate a renewable claim.

The system works in a narrow technical sense - but it does not link the certificate to the specific generation source, the time generation occurred, or the asset's location. A REGO retired against a February consumption period could have been purchased from generation at any point in the preceding year, even though the electricity actually consumed came from a gas-fired plant. The match is financial, not physical.

That may be adequate for disclosure frameworks that accept annual matching. For frameworks requiring temporal or geographic precision, it is not - and that gap is widening.

Why the standard market steers buyers away from the routes that work

The structures that deliver stronger evidenced progress - principally corporate power purchase agreements (CPPAs) and directly matched supply arrangements - are not inaccessible in principle. UK generators offer them. In practice, the standard market steers most buyers away.

CPPAs have traditionally required investment-grade credit ratings, long contract terms, and treasury appetite for price risk most I&C businesses don't carry. Direct generator relationships need volume most buyers can't aggregate alone. And the broker or standard supplier renewal through which most businesses enter the market isn't structured to surface these routes.

The result is predictable: genuine ambition ends up on tariffs that meet a minimum disclosure threshold but not the granular evidence scrutiny increasingly requires. That is a structural problem, not a failure of intent - and the default advisory model has not caught up.

The ambition gap - when the pledge and the evidence don't match

The ambition gap is the measurable distance between a corporate net zero commitment and the supply arrangement required to evidence it.

It is not fixed - it depends on the disclosure framework a business works to, its stakeholder relationships, and the state of its supply structure. For some it is narrow: their commitments accept annual REGO matching, which their current tariff already satisfies.

For others, the gap is larger and growing. The GHG Protocol's Scope 2 Guidance distinguishes market-based from location-based accounting, and RE100 criteria already call for electricity attribute certificates to be matched to consumption in the same hour and market. The Science Based Targets initiative (SBTi) is moving in the same direction under its Corporate Net-Zero Standard.

A business disclosing under these frameworks - or working toward them - needs a supply structure that can support the evidence. A standard green tariff may not be that structure.

The Ambition Gap is, in this sense, a governance risk: the distance between what a business has committed to and what it can currently prove.

Who is now checking

For most of the past decade, scrutiny of corporate sustainability claims sat primarily with the business itself - reports were reviewed, frameworks signed, but verification of energy-related Scope 2 claims was limited. That is no longer true.

UK-registered large companies have been subject to mandatory TCFD-aligned climate disclosure since 2022, extended to listed companies through FCA listing rules. The government's UK Sustainability Reporting Standards, published for voluntary use in February 2026 and closely aligned to the ISSB's global framework, are expected to become mandatory for listed companies' climate disclosures from 2027 - tightening the evidence bar further.

Supply chains are auditing too: a manufacturing business asked for Scope 3 data by a large automotive customer will find its energy arrangement is no longer private. Investors with net zero portfolio commitments can increasingly tell a tariff-level claim from a supply structure with genuine evidential weight.

The standard of evidence that satisfied scrutiny in 2020 will not satisfy it in 2027. Businesses that have not closed the Ambition Gap are in a position that is becoming less stable.

What closing the gap actually requires

The gap closes when the supply arrangement can answer the question the disclosure framework is asking.

For most I&C businesses that means moving beyond annual REGO matching toward supply structures with stronger provenance: CPPAs with named generators, half-hourly matched supply, or certificate-level traceability linking consumption to a specific generation source and period.

Some of those routes have historically required credit profiles or volume thresholds that excluded most commercial buyers - but that constraint isn't fixed. Consortium models, where aggregated demand creates the counterparty weight a single buyer can't provide, have opened direct renewable access to businesses that wouldn't qualify individually. Flexible supply frameworks, built around a buyer's load profile and risk appetite, can deliver the same provenance without a standard direct CPPA's terms.

The practical question isn't whether these routes exist - it's whether the business has been shown them, and whether its advisory relationship has the knowledge and incentive to surface them. Many haven't: the standard renewal process starts from the market offer, not the disclosure requirement.

The question your business energy supplier should answer

When the next sustainability report is prepared, or a supply chain customer asks for Scope 2 evidence, or an investor relations team fields a question about the pathway to net zero, the energy arrangement should be able to answer: here is the generation source, here is the certificate, here is the match between what we consumed and what we can evidence.

Neither a tariff name nor a supplier's own green credentials is that answer. The answer is a supply structure with documented provenance, traceable to generation.

The question is no longer whether meaningful progress on decarbonisation is achievable. For most I&C organisations, it is. The challenge is ensuring the route from ambition to evidence is supported by mechanisms that deliver measurable, auditable outcomes. Because when commitments are made, confidence comes from being able to demonstrate exactly how they are being delivered.

Sources

• Ofgem — Renewable Energy Guarantees of Origin (REGO) scheme guidance (accessed July 2026)

• GHG Protocol — Scope 2 Guidance: Executive Summary (December 2022)

• RE100 (Climate Group) — RE100 Technical Criteria (24 March 2025)

• Science Based Targets initiative (SBTi) — The Corporate Net-Zero Standard (2026)

• GOV.UK / Department for Business, Energy & Industrial Strategy — Climate-related financial disclosures for companies and limited liability partnerships (17 January 2022)

• GOV.UK / Department for Business and Trade — UK Sustainability Reporting Standards: UK SRS S1 and UK SRS S2 (25 February 2026)