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The REopt™ Lite web tool helps commercial building managers:

  • Evaluate the economic viability of grid-connected PV, wind, battery storage, CHP, and thermal energy storage at an existing site
  • Identify system sizes and battery dispatch strategies to minimize energy costs
  • Estimate how long a system can sustain critical load during a grid outage.

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.

Watch REopt Lite Tutorial Videos

Project Feedback

We want to hear from you! Tell us about your REopt Lite experience!

Step 0: Login and Gather Data

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 location


  

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 duration


  

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

Step 1: Choose Your Focus

Do you want to optimize for financial savings or energy resilience?


Step 2: Select Your Technologies

Which technologies do you wish to evaluate?


Step 3: Enter Your Site Data

Enter information about your site and adjust the default values as needed to see your results.

* Required field

* Location

Use sample site

* Electrical

* Required field

* Typical electrical load

How would you like to enter the typical energy load profile?

Building Details

Energy Consumption (kWh)

January
February
March
April
May
June
July
August
September
October
November
December

Select Building Type % of Total Energy Consumption

Sample custom load profile

Chart electric load data

* Typical heating boiler fuel load

How would you like to enter the typical thermal load profile?

Building Details

Monthly boiler fuel consumption (MMBtu)

January
February
March
April
May
June
July
August
September
October
November
December
Chart heating boiler fuel load data

* Typical cooling plant thermal load

How would you like to enter the typical chiller thermal load profile?

Building Details

Monthly thermal energy consumption (tonhour)

January
February
March
April
May
June
July
August
September
October
November
December

Monthly fixed percentage of total electric load (%)

January
February
March
April
May
June
July
August
September
October
November
December
Chart cooling plant load data
Advanced inputs
Reset to default values

Electricity Grid Emissions Factors

How would you like to enter the emissions factors?

Sample custom emissions profile
Chart emissions factor data

Fuel Emissions Factors

 

PV Incentives and Tax Treatment

Capital Cost or System Size Based Incentives
Database of state incentives for renewables
Incentive based on percentage of cost (%) Maximum dollar amount for incentive based on percentage of cost ($) Rebate based on system size ($/kW) Maximum dollar amount for rebate based on system size ($)

Unlimited

Unlimited
Production Based Incentives
Production incentive ($/kWh) Incentive duration (yrs) Maximum incentive ($) System size limit (kW)
Tax Treatment
Advanced inputs
Reset to default values
Advanced inputs
Reset to default values
Reset to default values
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