REopt Lite | REopt Energy Integration & Optimization

The REopt™ Lite web tool allows users to:

Evaluate the economic viability of distributed PV, wind, battery storage, 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 Lite 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:

location

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

Step 1: Choose Your Focus

Optimize for financial savings or energy resilience?

Financial Resilience

Step 2: Select Your Technologies

PV Battery Wind Generator CHP Chilled Water
Storage

Step 3: Enter Your Site Data

Site and Utility (required)

* Required field

* Site location

Use sample site

* Electricity rate

Use custom electricity rate

Energy Cost
($/kWh)

Demand Cost
($/kW/month)

January

February

March

April

May

June

July

August

September

October

November

December

Boiler fuel cost varies by month?

Monthly Boiler Fuel Cost ($/MMBtu)

January

February

March

April

May

June

July

August

September

October

November

December

* Annual existing boiler fuel cost ($/MMBtu)

CHP fuel cost varies by month?

Monthly CHP Fuel Cost ($/MMBtu)

January

February

March

April

May

June

July

August

September

October

November

December

* Annual CHP fuel cost ($/MMBtu)

Optional inputs

Reset to default values

Load Profile (required)

* Required field

* Typical electrical load

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

* Type of building

Building Details

Annual Monthly

Energy Consumption (kWh)

January

February

March

April

May

June

July

August

September

October

November

December

* Annual energy consumption (kWh)

* Total Energy Consumption (kWh)

Select Building Type	% of Total Energy Consumption

* Custom load profile

Year of load profile

Sample custom load profile

Download electric load profile

Chart electric load data

Electrical load adjustment

Adjust electricity consumption

100% of original consumption

* Typical heating boiler fuel load

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

Simulate
Upload

* Type of building

Building Details

Annual Monthly

Monthly boiler fuel consumption (MMBtu)

January

February

March

April

May

June

July

August

September

October

November

December

* Annual boiler fuel consumption (MMBtu)

* Custom heating boiler fuel load profile

Download heating boiler fuel load profile

Chart heating boiler fuel load data

* Typical cooling plant thermal load

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

* Type of building

Building Details

Annual Monthly

Monthly thermal energy consumption (tonhour)

January

February

March

April

May

June

July

August

September

October

November

December

* Annual thermal energy consumption (tonhour)

* Thermal energy consumption load profile

Annual Monthly

* Annual fixed percentage of total electric load (%)

Monthly fixed percentage of total electric load (%)

January

February

March

April

May

June

July

August

September

October

November

December

Download cooling load profile

Chart cooling plant load data

Electric cooling plant coeff. of performance (kWt/kWe)

Max. chiller thermal capacity as factor of peak cooling load

Resilience (required)

* Outage information

* Outage duration (hours)

* Outage start date

Autoselect using critical load profile

* Outage start time

Reset to default values

Financial

Analysis period (years)

Host discount rate, nominal (%)

Electricity cost escalation rate, nominal (%)

Existing boiler fuel cost escalation rate, nominal (%)

CHP fuel cost escalation rate, nominal (%)

Use third-party ownership model

Advanced inputs

Reset to default values

Emissions

Electricity Grid Emissions Factors

How would you like to enter the emissions factors?

Source of hourly grid emissions factors

Annual grid emissions factor (lbs CO2/kWh)

* Hourly emissions factors

Sample custom emissions profile

Download emissions factor data

Chart emissions factor data

Fuel Emissions Factors

Boiler natural gas emissions factor (lbs CO2/MMBtu)

CHP natural gas emissions factor (lbs CO2/MMBtu)

PV

System capital cost ($/kW)

Existing PV system?

Minimum new PV size (kW DC)

Maximum new PV size (kW DC)

Advanced inputs

Reset to default values

PV Costs

O&M cost ($/kW per year)

PV System Characteristics

Module type

Array type

Array azimuth (deg)

Array tilt (deg)

DC to AC size ratio

System losses (%)

PV generation profile

PV Station Search Radius (mi)

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 ($)
Federal	default = 26%	Unlimited	default = $0	Unlimited
State	default = 0%	default = Unlimited	default = $0	default = Unlimited
Utility	default = 0%	default = Unlimited	default = $0	default = Unlimited

Production Based Incentives

	Production incentive ($/kWh)	Incentive duration (yrs)	Maximum incentive ($)	System size limit (kW)
Total	default = $0	default = 1	default = Unlimited	default = Unlimited

Tax Treatment

MACRS schedule

MACRS bonus depreciation

Reset to default values

Battery

Energy capacity cost ($/kWh)

Power capacity cost ($/kW)

Allow grid to charge battery

Minimum energy capacity (kWh)

Maximum energy capacity (kWh)

Advanced inputs

Reset to default values

Wind

Size class

System capital cost ($/kW)

Minimum size desired (kW AC)

Maximum size desired (kW AC)

Advanced inputs

Reset to default values

	Production incentive ($/kWh)	Incentive duration (yrs)	Maximum incentive ($)	System size limit (kW)
Total

Generator

Install cost ($/kW)

Diesel cost ($/gal)

Fuel availability (gallons)

Minimum new generator size (kW)

Maximum new generator size (kW)

Existing diesel generator?

* Existing diesel generator size (kW)

Advanced inputs

Reset to default values

Combined Heat & Power

Prime Mover

Prime mover type

Size class

Change default prime mover & size class?

Minimum electric power capacity (kW)

Minimum non-zero power capacity (kW)

Maximum electric power capacity (kW)

Use single cost ($/kW) for all CHP sizes?

Size-Cost Pair 1

Size-Cost Pair 2

Electric power capacity (kW)

Total installed cost ($/kW)

Advanced prime mover inputs

Reset to default values

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.

* Custom downtime schedule

Download schedule

View summary table View detailed table

CHP Costs

Fixed O&M Cost ($/kW/yr)

Variable O&M Cost ($/kWh)

CHP System Characteristics

Electric efficiency at 100% load (% HHV-basis)

Electric efficiency at 50% load (% HHV-basis)

Thermal efficiency at 100% load (% HHV-basis)

Thermal efficiency at 50% load (% HHV-basis)

Min. electric loading of prime mover (% of rated electric capacity)

Knockdown factor for CHP-supplied thermal to Absorption Chiller (%)

CHP 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 ($)
Federal	default = 10%	Unlimited	default = $0	Unlimited
State	default = 0%	default = Unlimited	default = $0	default = Unlimited
Utility	default = 0%	default = Unlimited	default = $0	default = Unlimited

Production Based Incentives

	Production incentive ($/kWh)	Incentive duration (yrs)	Maximum incentive ($)	System size limit (kW)
Total	default = $0.000	default = 1	default = Unlimited	default = Unlimited

Tax Treatment

MACRS schedule

MACRS bonus depreciation

Reset to default values

	Weekend (hrs)	Weekday (hrs)	Total (hrs)
Total
January
February
March
April
May
June
July
August
September
October
November
December

Maintenance Periods
Start Date & Time	End Date & Time	Length (hrs)

Hot Water Storage

Minimum size (gal)

Maximum size (gal)

Total installed cost ($/gal)

Advanced inputs

Reset to default values

Absorption Chiller

Absorption Chilling

Minimum size (ton)

Maximum size (ton)

Total installed cost ($/ton)

Advanced inputs

Reset to default values

	Weekend (hrs)	Weekday (hrs)	Total (hrs)
Total
January
February
March
April
May
June
July
August
September
October
November
December

Maintenance Periods
Start Date & Time	End Date & Time	Length (hrs)

Combined Heat & Power

Prime Mover

Prime mover type

Size class

Change default prime mover & size class?

Minimum electric power capacity (kW)

Minimum non-zero power capacity (kW)

Maximum electric power capacity (kW)

Use single cost ($/kW) for all CHP sizes?

Size-Cost Pair 1

Size-Cost Pair 2

Electric power capacity (kW)

Total installed cost ($/kW)

Advanced prime mover inputs

Reset to default values

CHP Maintenance Schedule

Default
Upload

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.

* Custom downtime schedule

Download schedule

View summary table View detailed table

CHP Costs

Fixed O&M Cost ($/kW/yr)

Variable O&M Cost ($/kWh)

CHP System Characteristics

Electric efficiency at 100% load (% HHV-basis)

Electric efficiency at 50% load (% HHV-basis)

Thermal efficiency at 100% load (% HHV-basis)

Thermal efficiency at 50% load (% HHV-basis)

Min. electric loading of prime mover (% of rated electric capacity)

Knockdown factor for CHP-supplied thermal to Absorption Chiller (%)

CHP 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 ($)
Federal	default = 10%	Unlimited	default = $0	Unlimited
State	default = 0%	default = Unlimited	default = $0	default = Unlimited
Utility	default = 0%	default = Unlimited	default = $0	default = Unlimited

Production Based Incentives

	Production incentive ($/kWh)	Incentive duration (yrs)	Maximum incentive ($)	System size limit (kW)
Total	default = $0.000	default = 1	default = Unlimited	default = Unlimited

Tax Treatment

MACRS schedule

MACRS bonus depreciation

Reset to default values

	Weekend (hrs)	Weekday (hrs)	Total (hrs)
Total
January
February
March
April
May
June
July
August
September
October
November
December

Maintenance Periods
Start Date & Time	End Date & Time	Length (hrs)

Chilled Water Storage

Minimum size (gal)

Maximum size (gal)

Total installed cost ($/gal)

Advanced inputs

Reset to default values

The REopt™ Lite web tool allows users to:

Watch REopt Lite Tutorial Videos

Step 0: Login and Gather Data

Step 1: Choose Your Focus

Step 2: Select Your Technologies

Step 3: Enter Your Site Data

Location

Electrical

Fuel

* Typical electrical load

Electrical load adjustment

* Typical heating boiler fuel load

* Typical cooling plant thermal load

* Critical electric load

* Outage information

Electricity Grid Emissions Factors

Fuel Emissions Factors

PV Costs

PV System Characteristics

PV Incentives and Tax Treatment

Capital Cost or System Size Based Incentives

Production Based Incentives

Tax Treatment

Battery Costs

Battery Characteristics

Battery Incentives and Tax Treatment

Capital Cost Based Incentives

Tax Treatment

Wind Costs

Wind Incentives and Tax Treatment

Capital Cost or System Size Based Incentives

Production Based Incentives

Tax Treatment

Generator Costs

Generator Characteristics

Prime Mover

CHP Maintenance Schedule

CHP Costs

CHP System Characteristics

CHP Incentives and Tax Treatment

Capital Cost or System Size Based Incentives

Production Based Incentives

Tax Treatment

Hot Water Storage

Hot Water Storage Costs

Hot Water Storage System Characteristics

Absorption Chilling

Absorption Chiller Costs

Absorption Chiller System Characteristics

Prime Mover

CHP Maintenance Schedule

CHP Costs

CHP System Characteristics

CHP Incentives and Tax Treatment

Capital Cost or System Size Based Incentives

Production Based Incentives

Tax Treatment