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The passage of the Inflation Reduction Act of 2022 impacts the value of the U.S. Investment Tax Credit available for many of the technologies modeled by REopt. Accordingly, the REopt default Federal incentive based on percentage of capital cost has been updated to 30% for PV, Wind, CHP, GHP, and Battery systems (from 26%, 26%, 10%, 10%, and 0%, respectively). This value assumes the project meets prevailing wage and registered apprenticeship requirements. See the White House Guidebook for more details.

2023 is also the first year of the phase-down of the MACRS bonus depreciation (per the Tax Cuts and Jobs Act of 2017). Accordingly, the REopt default value for MACRS bonus depreciation has been updated to 80% for PV, Wind, CHP, GHP, and Battery systems (from the previous 100% for all technologies).

The REopt® web tool allows users to:

  • Evaluate the economic viability of distributed PV, wind, battery storage, combined heat and power (CHP), and thermal energy storage
  • Identify system sizes and dispatch strategies to minimize energy costs
  • Estimate how long a system can sustain critical load during a grid outage.

Watch REopt Tutorial Videos

Step 0: Login and Gather Data

Logging in (optional) enables you to:


save your evaluations


create a custom electricity rate


build a critical load profile


manage typical and critical load profiles

Data needed for a Financial run:




electricity rate


load (interval data or building type)


fuel cost (if CHP is modeled)

Data needed for a Resilience run:


critical load assumptions


outage duration


outage start date and time