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Carbon accounting

An inventory that survives
the assurance sample

A greenhouse gas inventory built to survive assurance, including the Scope 3 categories most companies would rather estimate.
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Carbon accounting
15
Scope 3 categories covered
±3%
Typical assured uncertainty
100%
Restatements documented
Numbers you can defend line by line
Overview

Numbers you can defend line by line

Most inventories are correct in Scope 1 and vague everywhere else. We build the whole thing to one standard, including the categories that are hard.
Boundary setting and documentation
Activity data collection design
Supplier-specific Scope 3 factors
Calculation workbooks under version control
Assurance pack preparation
Restatement policy and history
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Benefits

Why a rigorous inventory
is worth the effort

Six reasons the quality of the inventory decides the quality of every decision that follows it.
Cheaper assurance
Cheaper assurance
An auditable trail turns assurance into sampling, which costs a fraction of a reconstruction.
Real reduction targets
Real reduction targets
You cannot set a credible target against a number you would not defend under question.
Supplier leverage
Supplier leverage
Supplier-specific factors reveal which relationships actually carry your footprint.
Incentives unlocked
Incentives unlocked
Grants and sustainability-linked finance require assured figures, not estimates.
Comparable over time
Comparable over time
A documented restatement policy keeps this year's number comparable with last year's.
Fewer surprises
Fewer surprises
Categories built properly the first time do not have to be rebuilt when the standard tightens.
Provenance behind every figure
Why we are

Provenance behind every figure

Where a number came from matters as much as the number, because the number will change and the method has to survive it.
Boundaries documented
Organizational and operational boundaries written down with the reasoning behind each choice.
Factors under version control
Every emissions factor carries its source, vintage and the date it was applied.
Scope 3 done properly
Spend-based estimates replaced with supplier data category by category, on a published schedule.
Assurance rehearsed
We sample our own work before the auditor does, and fix what they would have found.

An emissions inventory is an accounting system, and it fails for accounting reasons: unclear boundaries, inconsistent factors, undocumented estimates, and a spreadsheet that only one person understands. Assurance providers find these in the first afternoon.

Boundaries and baselines

We fix the organizational boundary first — operational control, financial control or equity share — and apply it consistently across every entity, including joint ventures and leased assets. A boundary that shifts between years makes a trend line meaningless and a target unverifiable.

The base year is chosen with recalculation triggers written down in advance: what level of acquisition, divestment or methodology change forces a restatement. Deciding that after an acquisition is how a company ends up appearing to hit a target it did not hit.

Scope 3, where the emissions actually are

For most of our clients, nine tenths of the footprint sits outside their own operations. Spend-based estimation gets you a first number quickly and then stops being useful, because reducing emissions no longer reduces the reported figure.

  • Purchased goods and services, moved to supplier-specific factors for the top vendors by spend
  • Upstream and downstream transport, built from freight records rather than modeled tonne-kilometers
  • Use of sold products, modeled from real usage data where the product is energy-consuming
  • Investments and financed emissions, where a financial institution’s whole material footprint usually lives

The point of Scope 3 is not the number. It is knowing which twenty suppliers to call.

Making it repeatable

We leave behind a documented methodology, a factor library with versions and sources, and a calculation workbook or platform configuration that a new hire can run. Every figure traces to a source document. Where an estimate is unavoidable, the method and its uncertainty are written into the inventory rather than into someone’s memory.

That documentation is what turns an annual scramble into a quarterly process, and what makes limited or reasonable assurance affordable when your disclosure regime starts requiring it.

FAQs

Frequently asked
questions

Frequently asked questions
Photovoltaic modules convert sunlight directly into direct current electricity, which an inverter converts to alternating current for your site or the grid. Output follows irradiance rather than demand, which is why we model your hourly load alongside the resource before fixing a system size.
Every engagement starts from your own data — interval meter readings, an asset register, or a year of on-site measurement — rather than from a template. The design that follows is sized to your load profile, site constraints and growth plan, and we show you the trade-offs we made on the way.
Advisory engagements usually run six to sixteen weeks. Built projects depend almost entirely on permitting and grid connection: a commercial rooftop can be energized inside a year, while utility-scale generation typically runs two to four years from site control to commercial operation.
Yes. We build the inventory, install the controls, map one data set out to whichever frameworks apply to you, and draft the disclosure itself. We also run assurance readiness reviews so the first engagement with an auditor is not the first time the process is tested.
We build the pathway from your asset register, aligning abatement to replacement cycles so you are not writing off working equipment. We also quantify the residual emissions honestly and help you procure durable removals against them, rather than assuming the last ten percent away.