Microgrid Payback Timeline Calculator

1. Enter installed cost

Use the total project cost before grants, rebates, or other incentives.

2. Subtract external funding

Enter incentives that directly reduce the owner-funded investment.

3. Add recurring benefits

Include annual energy savings, estimated resilience value, and grid-service revenue only when they are supportable for the project.

4. Enter annual operating cost

Include maintenance, software, service contracts, and other recurring microgrid expenses.

5. Review the payback period

Compare the result with equipment life, financing terms, and a fuller discounted cash flow analysis.

Net investment = Project cost − Incentives Annual net benefit = Energy savings + Resilience value + Program revenue − Annual operating cost Simple payback (years) = Net investment ÷ Annual net benefit

The model assumes annual benefits remain constant and occur evenly over time. It excludes financing costs, taxes, degradation, escalation, replacement cycles, and the time value of money.

What the result means

The main result is the number of years of constant annual net benefit needed to recover the net investment.

A project with uneven cash flows should be evaluated with a year-by-year cash flow model in addition to this screening result.

Given: $1,200,000 project cost, $180,000 incentives, $145,000 energy savings, $35,000 resilience value, $28,000 grid-service revenue, and $42,000 annual operating cost.

Calculation: Net investment = $1,200,000 − $180,000 = $1,020,000. Annual net benefit = $145,000 + $35,000 + $28,000 − $42,000 = $166,000. Payback = $1,020,000 ÷ $166,000 = 6.14 years.

Result: The simple payback period is about 6.14 years.