Internal carbon pricing is a management tool that attaches a monetary value to each tonne of carbon dioxide equivalent so emissions carry a cost inside investment decisions, applied either as a shadow price used notionally during project appraisal to steer capital expenditure or as an internal carbon fee that levies a real charge on business units.
What internal carbon pricing is
Internal carbon pricing attaches a monetary value to a tonne of carbon dioxide equivalent so that emissions carry a cost inside investment and operating decisions. Two mechanisms dominate corporate practice, and they differ in whether money actually moves. The tool converts a measured inventory into a signal that shapes spending, and it sits alongside the wider discipline covered by GreenSutra’s carbon footprint solutions. No standard or universal price level exists, so each organisation sets and discloses its own value and rationale.
Shadow price versus internal carbon fee
The two dominant forms diverge on whether cash changes hands.
| Mechanism | How it works | Money movement |
|---|---|---|
| Shadow price | A notional value applied to each tonne during appraisal, testing capital projects, supplier choices and long term scenarios. | No payment, so it influences decisions rather than budgets. |
| Internal carbon fee | A real charge levied on business units for their emissions. | Actual financial flows, typically ring fenced into a low carbon fund or redistributed. |
Of the companies that disclosed an internal carbon price to CDP, over five in ten, around half, reported using shadow pricing, consistently the most common type since CDP began collecting the data.
How each is set and steers capital expenditure
Neither mechanism follows a set rate; the level and rationale are chosen by the organisation and applied consistently. The forms differ in how they bite:
- Shadow price, a notional value embedded in the discounted cash flow or hurdle rate of a project, so a carbon intensive option looks more expensive on a like for like basis and lower emission alternatives compete better.
- Internal carbon fee, a real charge that raises collectable funds, typically ring fenced into a central low carbon or decarbonisation fund, or redistributed.
- Implicit price, a weaker form representing the cost already borne through abatement spending rather than a deliberately set rate.
For capital expenditure decisions the shadow price influences appraisal while the fee moves budgets, so many organisations pair the two. Building the underlying inventory that any price is applied to is the subject of the carbon footprint guide. Across GreenSutra’s carbon footprint work, an internal carbon price gains traction only once a credible emissions inventory sits beneath it.
Sources: CDP, Putting a Price on Carbon · World Bank Carbon Pricing Leadership Coalition