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Energy Systems Analysis Tools

Use these energy systems analysis models and tools developed or supported by NREL to assess, analyze, and optimize renewable energy and energy efficiency technologies for your project.

Many of these tools can be applied on a global, regional, local, or project basis. NREL models and tools include several designed for the consumer or energy professional.

Buildings Industry Transportation Electricity Scenarios (BITES)

See how changes in energy demand and supply by economic sector can impact carbon dioxide emissions.

dsgrid: Demand-Side Grid Model

Harnesses decades of sector-specific energy modeling expertise to understand current and future U.S. electricity load for power systems analyses.


Evaluate design options for both off-grid and grid-connected power systems for remote, stand-alone, and distributed generation applications. HOMER is licensed to and maintained by Homer Energy.

Interactive Mapping Tools

Access RE Atlas, Solar Power Prospector, PVWatts, and other popular tools that dynamically generate maps of renewable energy resources.


NREL uses this dispatch model to evaluate renewable generation as a function of system flexibility, and enabling technologies like demand response. Contact Paul Denholm for more information.

Regional Energy Deployment System (ReEDS)

NREL uses this multi-regional, multi-time period, GIS and linear programming model of U.S. electric sector capacity expansion to analyze critical issues in the electric sector.


Optimize energy systems for buildings, campuses, communities, and microgrids to meet cost savings and energy performance goals.

Resource Planning Model (RPM)

Capacity expansion modeling to inform utility or regional electric system planning, including for clean energy or carbon mitigation analysis, in the Western or Eastern Interconnections. Contact Trieu Mai for more information.

System Advisor Model (SAM)

Make performance predictions and cost of energy estimates for grid-connected power projects based on system design parameters that you specify.

Tribal Energy Atlas

Tribes and others can conduct their own analyses of installed energy projects and resource potential on tribal lands.