Energy & Sustainability worked example

Carbon Payback Period with carbon reduction project investment of 525,000 $: a worked example

What does the result look like when carbon reduction project investment reaches 525,000 $? The full calculation is worked below with real intermediate numbers. a sustainability or finance lead needs to screen a carbon-reduction investment

The inputs for this scenario

  • Carbon reduction project investment: 525,000 $ (raised for this scenario; the documented default is 210,000)
  • Annual cost savings or avoided carbon cost: 68,000 $ / yr (unchanged)
  • Annual operating and verification cost: 8,500 $ / yr (unchanged)

Working through the calculation

  • Applying the documented formula (Net annual carbon project savings = annual cost savings or avoided carbon cost - annual operating and verification cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 8.82 yr for carbon reduction simple payback, the number this scenario is built around.
  • At this operating point the engine returns 59,500 $ / yr for net annual carbon project savings.
  • At this operating point the engine returns 525,000 $ for carbon reduction project investment.
  • At this operating point the engine returns -227,500 $ for five-year carbon project net value.

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 150% above the baseline at 8.82 yr.
  • A figure at this level is achievable when carbon reduction project investment is genuinely sustained, not just peaked for a shift. It is a simple (undiscounted) payback that ignores the time value of money, escalating carbon prices, equipment degradation, and any salvage value, so it understates the case for long-lived assets and overstates short-lived ones.

Results at a glance

  • Carbon reduction simple payback: 8.82 yr (headline result)
  • Net annual carbon project savings: 59,500 $ / yr
  • Carbon reduction project investment: 525,000 $
  • Five-year carbon project net value: -227,500 $

Run it with your numbers

  • Every input above is editable in the live Carbon Payback Period calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.