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REopt Model Inputs and Outputs

The REopt™ model employs an integrated approach to optimizing the energy costs at a site by considering a range of project inputs and outputs.

The model's inputs include electricity and thermal energy consumption, water demand, resource availability and technology options, and other drivers such as complex tariff structures, incentives, net metering, and interconnection limits. Outputs include optimal energy technologies and system sizes, recommendations for system operations and dispatch, and an assessment of project economics.

Diagram of the REopt energy planning model’s techno-economic optimization inputs and output. Load inputs include thermal, electric, and water demand loads. Technology options include renewable generation (such as solar photovoltaic, wind, and biomass), conventional generation (such as electric grid, fuel supply, and conventional generators), energy storage (such as batteries, thermal storage, and water tanks), dispatchable technologies (such as heating and cooling, and water treatment), and energy conservation measures. Drivers include site goals (such as cost reduction, net zero, and resiliency), economics (such as financial parameters, technology costs, and incentives), and utility costs (such as energy charges, demand charges, and escalation rate). The REopt model uses these inputs to create an optimized minimum cost solution that includes recommended technologies, the technology mix and sizes, energy operations and optimal dispatch strategies, project economics, capital expenditures and operating expenses, and net present value.

A diagram describes REopt's inputs and output, including loads, technology options, drivers, and an optimized minimum cost solution. Illustration by NREL


REopt models the following energy technologies:

  • Solar photovoltaics (PV)
  • Solar hot water
  • Solar ventilation air preheating
  • Wind turbines
  • Biomass heating, electricity, and combined heat and power
  • Waste-to-energy heating, electricity, and combined heat and power
  • Landfill gas heating, electricity, and combined heat and power
  • Ground-source heat pumps
  • Fuel cells
  • Electric storage
  • Thermal storage
  • Water treatment and storage
  • Dispatchable heating and cooling
  • Energy conservation measures (via Open Studio)
  • Natural gas and diesel generation
  • Utility grid.