REopt Lite User Manual

Kate Anderson, Dan Olis, Bill Becker, Linda Parkhill, Nick Laws, Xiangkun Li, Sakshi Mishra, Ted Kwasnik, Andrew Jeffery, Emma Elgqvist, Kathleen Krah, Dylan Cutler, Alex Zolan, Nick Muerdter, Rob Eger, Andy Walker, Chris Hampel, Gregg Tomberlin

Research output: NRELTechnical Report


REopt Lite evaluates the economic viability of grid-connected solar photovoltaics, wind, combined heat and power, and electric and thermal storage at commercial and small industrial sites. It allows building owners to identify the system sizes and dispatch strategies that minimize the site’s life cycle cost of energy. REopt Lite also estimates the amount of time on-site generation and storage can sustain the site's critical load during a grid outage and allows the user the choice of optimizing for energy resilience. It is primarily used to inform project development decisions and to support research on the factors that drive project feasibility for market development and policy analysis. It is available through a web interface, application programing interface, and open-source code. This user manual provides an overview of the model, including its capabilities and typical applications; inputs and outputs; economic calculations; technology descriptions; and model parameters, variables, and equations. The model is highly flexible and is continually evolving to meet the needs of each analysis. Therefore, this report is not an exhaustive description of all capabilities, but rather a summary of the core components of the model.
Original languageAmerican English
Number of pages118
StatePublished - 2021

NREL Publication Number

  • NREL/TP-7A40-79235


  • distributed energy resources
  • REopt Lite
  • techno-economic optimization
  • tool


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