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About REopt

The REopt™ platform optimizes planning of generation, storage, and controllable loads to maximize the value of integrated distributed energy systems for buildings, campuses, and microgrids.

Formulated as a mixed integer linear program, REopt recommends an optimally sized mix of renewable energy, conventional generation, and energy storage technologies; provides a dispatch strategy for operating the technology mix at maximum economic efficiency; and estimates the net present value of implementing those technologies.

REopt's Multi-Technology Integration and Optimization Capabilities


Energy Costs and Revenue, Economics, Resilience and Environmental Goals
Input to REopt
Technology Options

Renewable Generation, Conventional Supply, Energy Storage
Input to REopt

Electric Loads, Heating and Cooling, Dispatchable Loads
Input to REopt
Renewable Energy Integration and Optimization Platform
Techno-Economic Decision Support
Output from REopt
Optimized Minimum Cost Solution

Technology Mix and Size

Optimal Dispatch Strategy
Project Economics

Capital Costs, Operating Costs, Net Present Value

REopt considers energy cost drivers, available energy technologies, and building energy loads and generates an integrated, cost-optimal energy solution that guides investment in economic, resilient, and sustainable energy systems. Illustration by Fred Zietz and Julia Laser, NREL

REopt Platform

Under development at NREL since 2007, the REopt platform was initially created to identify and prioritize cost-effective renewable energy projects across a portfolio of sites. REopt is now also used to optimize the size and operating strategy of microgrids, storage, and energy/water systems. NREL's REopt analyses have supported decisions that led to more than 260 megawatts of renewable energy development.

Learn more about the REopt development team.

Review a list of REopt partners and clients.

REopt Lite Web Tool

NREL's REopt Lite™ web tool offers a subset of the full REopt platform's capabilities at no cost to the user. REopt Lite helps commercial building managers evaluate the economic viability of grid-connected PV, wind, and battery storage at a site; identify system sizes and battery dispatch strategies to minimize energy costs; and estimate how long a system can sustain critical load during a grid outage.

In addition to the web tool, REopt Lite can also be accessed through an application programming interface and open source code.

The REopt Lite web tool has been funded, in part, by the U.S. Department of Energy's Federal Energy Management Program (FEMP) and Advanced Manufacturing Office, and by the Clean Energy Group's Resilient Power Project. Learn more about REopt Lite's ongoing development plans and software update history.

Researcher using visualization tools at NREL.

A REopt analysis can be applied to a variety of energy optimization projects.

Closeup of a computer using REopt

Download fact sheets, research publications, and more.

Researchers with an intern

REopt Lite can be used to supplement a broad range of teaching curricula.

Contact NREL to Initiate a REopt Analysis

NREL offers expert analysis services using the REopt model, which provides techno-economic decision support throughout the energy planning process—from portfolio-level screening to project development to energy asset operation.

There are two options for engaging with NREL to conduct a REopt analysis:

Email to learn more about REopt analysis services and the REopt Lite web tool.