Internal Carbon Pricing
Executive Summary
Key Takeaways
- ✓ Internal carbon pricing applies a company-determined carbon price to inform capital allocation, either as a notional shadow price used only in investment appraisal, or as an actual internal fee charged to business units, and the two mechanisms have materially different behavioural and cash flow effects.
- ✓ A shadow price affects which projects are approved by raising the effective hurdle for emissions-intensive capital expenditure in the appraisal calculation, without generating any actual cash flow or fund.
- ✓ An internal fee generates an actual cash flow, typically pooled into a fund used to finance abatement investment or offset other business unit costs, and therefore has a real balance sheet and incentive effect a shadow price does not.
- ✓ The internal price level should be set with an explicit, disclosed justification, commonly benchmarked against an external compliance price forecast or a target consistent with the entity's own decarbonisation commitments, rather than an arbitrary figure.
- ✓ The internal price should be applied consistently across all capital expenditure decisions it is intended to inform, not selectively to some business units or project types and not others, since selective application undermines its purpose as a capital allocation signal.
Objective¶
This guide covers applying internal carbon pricing within Climate Finance & Climate Financial Modelling, to inform capital allocation ahead of or independent of external compliance carbon pricing.
Shadow Price Versus Internal Fee¶
A shadow price affects which projects are approved by raising the effective hurdle for emissions-intensive capital expenditure in the appraisal calculation, without generating any actual cash flow. An internal fee generates an actual cash flow, typically pooled into a fund used to finance abatement investment (see Emissions Reduction Models) or offset other business unit costs, and therefore has a real balance sheet and incentive effect a shadow price does not.
Setting the Price Level¶
The internal price level should be set with an explicit, disclosed justification, commonly benchmarked against an external compliance price forecast (see Carbon Pricing Models) or a target consistent with the entity's own decarbonisation commitments, rather than an arbitrary figure with no stated basis.
Consistent Application Across Capital Expenditure¶
The internal price should be applied consistently across all capital expenditure decisions it is intended to inform, not selectively to some business units or project types and not others. Selective application undermines the price's purpose as a genuine capital allocation signal and can be used, whether deliberately or not, to favour specific projects rather than consistently reflect carbon cost across the portfolio.
Common Construction Pitfalls¶
Shadow price and internal fee conflated. Treating the two mechanisms as interchangeable overlooks their materially different cash flow and incentive effects.
Price level set without disclosed justification. An arbitrary internal price undermines the credibility of the capital allocation signal it is meant to provide.
Selective application across business units or project types. Undermines the price's purpose as a consistent capital allocation signal.
Recommended Practices¶
- State explicitly whether the internal carbon price operates as a shadow price, an internal fee, or both.
- Disclose the basis for the internal price level, benchmarked against compliance forecasts or decarbonisation targets.
- Apply the internal price consistently across all capital expenditure decisions it is intended to inform.
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Related Pillars¶
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Frequently Asked Questions
What is internal carbon pricing?
The practice of applying a company-determined carbon price to inform capital allocation, either as a notional shadow price used only in investment appraisal, or as an actual internal fee charged to business units, ahead of or independent of any external compliance carbon price the entity may also face.
What is the difference between a shadow price and an internal fee?
A shadow price affects which projects are approved by raising the effective hurdle for emissions-intensive capital expenditure in the appraisal calculation, without generating any actual cash flow, while an internal fee generates an actual cash flow, typically pooled into a fund financing abatement investment, and therefore has a real balance sheet and incentive effect a shadow price does not.
How should the internal carbon price level be set?
With an explicit, disclosed justification, commonly benchmarked against an external compliance price forecast or a target consistent with the entity's own decarbonisation commitments, rather than an arbitrary figure with no stated basis.
Why does consistent application matter?
Because the internal price should be applied across all capital expenditure decisions it is intended to inform, not selectively to some business units or project types and not others, since selective application undermines its purpose as a genuine capital allocation signal and can be used to favour specific projects rather than consistently reflect carbon cost across the portfolio.
References
Related Articles
Climate Finance & Climate Financial Modelling
Climate finance is the mobilisation and allocation of capital toward mitigation, adaptation, and transition activity, and climate financial modelling is the discipline of representing that activity's cash flows, risk, and concessionality in a financial model. This page is the hub for the Knowledge Centre's climate finance content: how sustainable, green, and transition finance are distinct but related capital allocation frames, how a climate investment model differs from a standard project or corporate model in its treatment of concessional capital and additionality, how physical and transition climate risk are quantified at portfolio and entity level, and how carbon markets, climate-sector investment, and institutional governance practice build on these foundations as this domain expands.
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Carbon pricing models forecast a specific carbon price, whether a carbon tax rate or emissions trading scheme allowance price, and apply it as a direct cash flow driver against a portfolio's or entity's emissions exposure. This is a distinct task from choosing a discount-rate-premium or cash-flow-scenario methodology for reflecting climate risk in a single valuation; this guide covers building the carbon price forecast itself and applying it consistently across exposed cash flows.
Emissions Reduction Models
An emissions reduction, or marginal abatement cost, model ranks available abatement options by cost per tonne of emissions reduced, providing the analytical basis for prioritising capital toward the lowest-cost reduction opportunities first. This guide covers how to build an abatement cost curve, the distinction between capital-funded abatement measures and operational efficiency measures, and how the curve should tie directly to investment decision-making rather than remaining a standalone analytical exercise.
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