Energy & Sustainability worked example

Carbon Payback Period with carbon reduction project investment of 105,000 $: a worked example

This worked example runs the carbon payback period numbers for a tougher week than the baseline: carbon reduction project investment of 105,000 $ instead of the typical 210,000 $. Estimate simple payback for a carbon-reduction project from investment, annual savings, and recurring support cost.

The inputs for this scenario

  • Carbon reduction project investment: 105,000 $ (the input this scenario stresses; the baseline uses 210,000)
  • Annual cost savings or avoided carbon cost: 68,000 $ / yr (held at the documented default)
  • Annual operating and verification cost: 8,500 $ / yr (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Net annual carbon project savings = annual cost savings or avoided carbon cost - annual operating and verification cost.
  • Carbon reduction simple payback works out to 1.76 yr at these inputs, and this is the headline figure for the scenario.
  • Net annual carbon project savings works out to 59,500 $ / yr at these inputs.
  • Carbon reduction project investment works out to 105,000 $ at these inputs.
  • Five-year carbon project net value works out to 192,500 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where carbon reduction project investment sits at 210,000 $ and the headline result is 3.53 yr, this scenario comes in 50% below the baseline at 1.76 yr.
  • Use it during capital screening to compare sustainability projects on a cash-recovery basis before committing to detailed engineering or a full lifecycle/NPV analysis. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Carbon reduction simple payback: 1.76 yr (headline result)
  • Net annual carbon project savings: 59,500 $ / yr
  • Carbon reduction project investment: 105,000 $
  • Five-year carbon project net value: 192,500 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Carbon Payback Period calculator, set carbon reduction project investment to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.