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A world class service and world class tools

Oliver Wyman's Carbon Accounting as a Service combines deep industry expertise, regulatory know-how, carbon accounting skills and purpose built tools to enable an agile and efficient process. Our service is available globally to support national and multinational clients wishing to establish, verify and model their Corporate Carbon Footprint.

In this document we outline the services we provide, which include:

Calculation of your emissions baseline including scope 1, 2 and 3

Validation of an existing emissions baseline

Deployment of custom emission factors

Dynamic modelling of business growth, and active and passive abatement

Handover of tools to your organization to use on an ongoing basis

Future updates and support

Baseline Validation

If your firm has a baseline already we can validate it, and then synch with it to provide a dynamic digital twin for abatement modelling.

Baseline validation provides an expert view. But we are not here to ‘mark homework’, our service fills any gaps you may have intentionally left in your baseline, checks emissions are in the appropriate categories and are mapped to suitable LCA data, and ensures everything aligns with the GHG protocol.

Oliver Wyman is then able to create a digital twin of the baseline, that is a perfect mathematical match, though now in a dynamic form where emissions factors are not fixed parameters in the calculation process

EU Regulatory Timeframe

Baseline Calculation

If your firm has yet to calculate your emissions baseline, Oliver Wyman is here to help.

Our baseline calculation programs typically take no more than six weeks to complete, and place minimal demands on your team’s resources. The process involves a number of steps:

  1. Agreeing who will do what between our teams.
  2. Considering whether it makes sense to conduct a pilot with one of your business units or territories before rolling out firm-wide.
  3. Obtaining the data we need from your ERP system or other source. This will preferably be activity-based data, but we can work with spend-based data if that is all that is available.
  4. Arranging the data into the correct scope 3 categories.
  5. Inputting that data into our tools, providing both a record of emissions suitable for regulatory reporting and a dynamic model for abatement planning.
  6. Conducting automated mapping of the data to best in class emission factors.
  7. Performing the calculations to determine the emissions.

Best in class emissions factors built in

Transparent, auditable, updateable, customizable. Oliver Wyman tools deploy the most granular and accurate emissions factors available. We can create custom datasets where useful and offer a periodic update service to keep you in lock step with improvements in accuracy and coverage.

EU Regulatory Timeframe
EU Regulatory Timeframe
EU Regulatory Timeframe

Dynamic Modelling of Business Growth, and Passive and Active Abatement

A forward-looking tool that provides your leaders with the scenarios they need to decide their business strategy. Our tools allow granular modelling of three key drivers:

Business growth. Most businesses target growth. All things being equal this growth will cause your emissions to rise, and it takes business growth of less than 3% a year between now and 2050 to make emissions double. Our tools take into account this business growth, projected market by market, so the model accurately reflects the future.

Passive abatement. The main contributor to passive abatement is the decarbonization of national power grids. Oliver Wyman has extensive models of the abatement of power grids in over 160 countries and this data is integral to our tool’s dynamic modelling.

Active abatement. Once the baseline has shown hotspots, we can support your efforts to plan ways in which active abatement, in other words the actions you take across all 15 scope 3 categories to reduce your emissions. The tools allow fine tuning of abatement by location, procurement and other actors to create multiple emissions scenarios between now and 2050 with inflection points along the way.

EU Regulatory Timeframe

1. Real-time impactassessment

2. Forecast and track portfolio emissions

3. Incorporate business growth assumptions

4. Validation against Science Based Targets

5. Assess impact of excluding emissions categories

6. Passive abatement via decarbonisation of national power grids

7. Deep drill into individual scope category forecasts

8. Model benefits and costs of CCUS and other abatement actions

In Synch With Your Baseline and Full Version Control

Ready for regulatory requirements today and future abatement scenario modelling.

Whether you have already calculated and submitted your baseline emissions, for example to SBTi, or Oliver Wyman has helped you with that process, it is important you can always return to your baseline for four reasons:

  • As a matter of record
  • So future team members can understand how it was calculated
  • In the likely event that regulators wish historic calculations to be re-run in future using the latest LCA data or to model other changes
  • To provide a comparison with future abatement model scenarios

Version control, therefore, is essential and our tools provide this functionality.

EU Regulatory Timeframe
EU Regulatory Timeframe


Please get in touch with us, whether you have a general enquiry, would like to see if your firm or organization is eligible for a free pilot analysis, to book a demo, or if you'd like to join our team.

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