The REopt™ Lite web tool helps commercial building managers:
REopt Lite offers a no-cost subset of features from NREL's more comprehensive REopt model. REopt Lite also offers an application programming interface (API) and open source code. Send questions and tool feedback to REopt@nrel.gov.
We want to hear from you! Tell us about your REopt Lite experience!
Registering and logging in is optional, but you must be logged in to:
save your evaluations
create a custom electricity rate
build a critical load profile
manage your typical and critical load profiles
Data needed for a Financial run:
site electricity rate
building type plus annual or monthly energy consumption OR a custom load profile
fuel cost for existing boiler and CHP(if CHP is modeled)
Additional data needed for a Resilience run:
critical load factor OR custom critical load profile OR critical load components to build a profile
outage start date and time (can be taken from your critical load profile)
* For all non-required inputs, the gray default values will be used unless you enter custom inputs
Do you want to optimize for financial savings or energy resilience?
Which technologies do you wish to evaluate?
Select additional CHP technologies to evaluate
Enter information about your site and adjust the default values as needed to see your results.
* Required field
Energy Cost ($/kWh)
Demand Cost ($/kW/month)
You must be logged in to create a Custom Tariff.
Monthly Boiler Fuel Cost ($/MMBtu)
Monthly CHP Fuel Cost ($/MMBtu)
How would you like to enter the typical energy load profile?
Energy Consumption (kWh)
Sample custom load profile
How would you like to enter the typical thermal load profile?
Monthly boiler fuel consumption (MMBtu)
How would you like to enter the typical chiller thermal
Monthly thermal energy consumption (tonhour)
Monthly fixed percentage of total electric load (%)
How would you like to enter the critical energy load profile?
The Critical Load Builder allows you to build, edit, and manage your load profiles.
You must be logged in to build a critical load profile. Login or register
How would you like to enter the emissions factors?
A default maintenance schedule has been selected based on your prime mover type and the year of your electric load profile.
Use the summary table and detailed table links below to view the details of the default schedule.