Skip to main content

REopt Lite Software Update History

NREL updates the REopt™ Lite web tool on a regular basis. Review REopt Lite's software update history below.

April 2019: PVWatts and Solar Resource Data Set Upgrade

Version 1.4.1 of REopt Lite includes updated solar photovoltaic (PV) system performance data with an upgrade to PVWatts 6, which incorporates additional international solar resources from the National Solar Radiation Database (NSRDB) data set.

March 2019: Custom Hourly Rate Tariffs and Integrated Critical Load Builder

Version 1.4 of REopt Lite includes custom hourly utility rate tariff capabilities and an integrated critical load profile builder, for a more detailed energy analysis without leaving the tool. The latest update includes a wide range of existing or hypothetical utility rates and helps identify systems that can sustain specific critical loads during a site outage.

November 2018: Wind Module, Custom Monthly Rate Tariffs, Critical Load Builder, and User Dashboard

Version 1.3 of REopt Lite includes a new wind optimization module, custom monthly utility rate tariffs, a link to the SolarResilient critical load builder, and a new user dashboard. These features allow users to evaluate the economic viability of distributed wind alongside solar PV and battery storage, and further customize cost savings and resilience analyses. The user dashboard lets users log in, save their optimization results, and view previous runs.

June 2018: Enhanced Resilience Features

Version 1.2 of REopt Lite includes enhanced resilience analysis capabilities that allow building owners and energy managers to size PV and storage systems to meet a specified outage duration, and compare systems sized for optimum savings to systems sized for resilience. Users can also explore the impact of microgrid upgrade costs and avoided outage costs on project economics.

March 2018: Application Programming Interface

Version 1.1 of REopt Lite includes a new application programming interface (API) that lets users and software developers programmatically interface with the REopt Lite web tool. The API can be used to evaluate multiple sites and perform sensitivity analyses in an efficient manner, and integrate REopt Lite capabilities into other tools. Access the API.

In addition to the API release, REopt Lite developers added a downloadable dispatch strategy and additional utility rates to the web tool.

September 2017: REopt Lite's Initial Release

Version 1.0 of the REopt Lite web tool, deployed on September 29, 2017, helps building owners evaluate the economics of grid-connected PV and battery storage at commercial sites. It identifies the optimal PV system size and battery dispatch strategy to minimize the life cycle cost of energy at a specific site, and estimates the amount of time a PV and battery system can sustain the site's critical load during a grid outage. 

For the first time, REopt Lite provides public access to a subset of NREL’s comprehensive REopt model, and allows users to run their own site-specific, optimized, and integrated renewable energy decision analysis in order to accelerate renewable energy and storage project development and deployment. 

Future Development Plans

Learn more about future software development plans for the REopt Lite web tool.