Energy Analysis Tools

    GREET Updates

    The Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation model includes multiple new fuel pathways and updated assumptions.

    Find analysis tools—models, software, and calculators—for analysis activities. Many of these tools cut across clean energy technologies or intersect topics such as market and policy analysis.

    Cross-Sector Calculators

    Facility Energy Decision System (FEDS)
    Source: Federal Energy Management Program
    Analyze energy efficiency in a single or multiple buildings, including central energy plants and thermal loops; compare energy savings potential across sites; identify retrofits by selecting minimum life-cycle costs, determining payback, and prioritizing options.
    Federal Renewable Energy Screening Assistant (FRESA)
    Source: Federal Energy Management Program
    Analyze the use of renewable energy technologies for buildings and facilities; identify technologies appropriate for implementation; evaluate systems to reduce electricity, fuel use, and greenhouse gas emissions.
    HOMER Energy Modeling Software
    Source: Homer Energy
    Design and analyze hybrid power systems; determine how variable resources can be optimally integrated into hybrid systems; simulate energy systems, compare results, and get projections of capital and operating expenses.
    Jobs and Economic Development Impacts (JEDI)
    Source: National Renewable Energy Laboratory
    Estimate the economic impacts of constructing and operating power generation and biofuel plants at the local (usually state) level; estimates the number of jobs and economic impacts that could reasonably be supported by a power generation project.
    Other Federal Energy Management Tools
    Source: Federal Energy Management Program
    Use the tools on this list to compare potential energy conservation measures by performing energy consumption analyses, modeling, and comparative life-cycle costing analyses.


    Cost of Renewable Energy Spreadsheet Tool (CREST)
    Source: National Renewable Energy Laboratory
    Assess projects, design cost-based incentives (e.g., feed-in tariffs), and evaluate impacts of tax incentives and other support structures using this economic cash flow model.
    GridLab Power Distribution System Simulation
    Source: Pacific Northwest National Laboratory
    Examine in detail the interplay of every part of a distribution system with every other part of the system.
    In My Back Yard (IMBY)
    Source: National Renewable Energy Laboratory
    Estimate solar photovoltaic (PV) array and wind turbine electricity production based on system size, location, and other variables.
    Renewable Energy Deployment System (ReEDS)
    Source: National Renewable Energy Laboratory
    Optimize regional expansion of electric generation and transmission capacity in the continental United States over 50 years.
    System Advisor Model (SAM)
    Source: National Renewable Energy Laboratory
    Investigate the impact of variations in physical parameters, cost, and financial parameters to understand their impact on key figures of merit.

    Integrated Models

    Global Change Assessment Model (G-CAM)
    Source: Pacific Northwest National Laboratory
    Model economy, energy, and land-use for three end-use sectors and multiple conventional and renewable supply sectors in 14 global regions, including the United States; includes multiple supply technologies; tracks 16 emissions.
    Market Allocation Model (MARKAL)
    Source: Brookhaven National Laboratory
    Represent the evolution of specific energy systems at the local, state (or province), national, or regional level, over 40-50 years.
    National Energy Modeling System (NEMS)
    Source: Energy Information Administration
    Project the production, imports, conversion, consumption, and prices of energy, subject to assumptions on macroeconomic and financial factors, world energy markets, resource availability and costs, behavioral and technological choice criteria, cost and performance characteristics of energy technologies, and demographics.

    Policy Analysis

    OpenStudio Policy Analysis Tool
    Source: National Renewable Energy Laboratory
    Perform simple modeling and analysis by visually comparing sets of perturbation results and evaluating them against collections of standards rules.

    Advanced Manufacturing

    Advanced Manufacturing Tools
    Source: Advanced Manufacturing Office
    See this list of tools for identifying and analyzing energy system savings opportunities in plant and other industrial facilities.


    BeOpt (Building Energy Optimization) Software
    Source: National Renewable Energy Laboratory
    Evaluate residential building designs and identify cost-optimal efficiency packages at various levels of whole-house energy savings along the path to zero net energy; analyze new construction and existing home retrofits, and evaluate single building designs
    Commercial Buildings Sector Agent-Based Model
    Source: Argonne National Laboratory
    Model the market—participants, dynamics, and constraints—help decide whether to adopt energy-efficient technologies to meet commercial building energy-efficiency targets.
    DOE-2 Building Energy Use and Cost Analysis Software
    Source: Lawrence Berkeley National Laboratory
    Perform detailed comparative analysis of building designs and technologies by applying sophisticated building energy use simulation techniques; does not require extensive experience in building performance modeling.
    Energy 10
    Source: National Renewable Energy Laboratory/Sustainable Buildings Industry Council
    Identify the most cost-effective, energy-saving measures to take in designing small ((generally less than 10,000 square feet), low-energy, commercial and residential buildings that are characterized by one or two thermal zones
    Energy and Cost Savings Calculators for Energy-Efficient Products
    Source: Federal Energy Management Program
    Enter input values (e.g., utility rates, hours of use) to estimate energy and cost savings for energy-efficient products.
    Energy Plus
    Source: National Renewable Energy Laboratory
    Simulate the whole-building performance, and energy and water use buildings; model heating, cooling, lighting, ventilation, other energy flows, and water use; simulate multiple building systems and functions.
    Home Energy Saver
    Source: Lawrence Berkeley National Laboratory
    Quickly compute a home's energy use for all end uses, including heating, cooling, water heating, appliances, and lighting; get recommended energy-saving upgrades; estimates a home's carbon footprint.
    Home Energy Scoring Tool
    Source: Lawrence Berkeley National Laboratory
    Generate clear and credible home energy assessments; recommend customized upgrades and cost saving tips; compare the energy use of different homes
    Technology Deployment List
    Source: Federal Energy Management Program
    Identify emerging—and underused—energy-saving technologies, including building envelope; heating, ventilation, and air conditioning; lighting; water heating; and refrigeration, computer power management, and vending machine technologies.
    Other Buildings Tools
    Source: Building Technologies Program
    Use the tools in this directory to evaluate energy efficiency, renewable energy, and sustainability in buildings.

    Transportation and Vehicles

    Autonomie Automotive Simulation Tool
    Source: Argonne National Laboratory
    Rapidly evaluate new powertrain and propulsion technologies for improving fuel economy through virtual design and analysis in a math-based simulation environment.
    Fleet Atlas
    Source: National Renewable Energy Laboratory
    Locate agency fleet garages, alternative fueling stations, and proximate fleets; Analyze fleet vehicle counts, stations proximity to fleet garages, station details, and vehicle densities.
    Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation Model (GREET)
    Source: Argonne National Laboratory
    Evaluate engine and fuel combinations on a consistent fuel-cycle basis; Measure the petroleum displacement and greenhouse gas emissions of medium and heavy-duty vehicles and off-road equipment.
    GREET Fleet: Carbon and Petroleum Footprint Calculator
    Source: Argonne National Laboratory
    Calculate the petroleum and greenhouse gas footprint of a fleet; Compare alternative fuels and vehicle technologies before purchasing medium-duty, heavy-duty, or off-road vehicles
    Market Acceptance of Advanced Automotive Technologies Model (MA3T) Consumer Choice Model
    Source: Oak Ridge National Laboratory
    Project U.S. consumer demand for plug-in hybrid electric vehicles (PHEV) in competition among various light-duty vehicle technologies for hundreds of market segments based and multiple regions. For more information, contact the ORNL Energy and Transportation Science Division.
    Petroleum Reduction Planning Tool
    Source: National Renewable Energy Laboratory
    Evaluate and calculate petroleum reductions by choosing one or a combination of alternative fuels, hybrid electric vehicles, biodiesel blends, fuel economy, vehicle miles traveled reduction, truck stop electrification, idling time reduction, or onboard idle reduction.
    Source: National Renewable Energy Laboratory
    Customize map displays—and print and query underlying data—for existing and planned alternative fueling stations; alternative fuel production facilities; light-duty vehicle density; and roads and political boundaries.
    Vehicle Cost Calculator
    Source: National Renewable Energy Laboratory
    Calculate the total cost of ownership and emissions for makes and models of most vehicles, including alternative fuel and advanced technology vehicles.
    VISION Model for Vehicle Technologies and Alternative Fuels
    Source: Argonne National Laboratory
    Estimate the potential energy use, oil use, and carbon emission impacts of advanced light and heavy-duty vehicle technologies and alternative fuels through 2050.
    Other Vehicles Tools
    Source: Vehicle Technologies Program
    Use the tools on this list to assess the potential impacts of implementing new vehicle technologies.


    Biofuels Techno-Economic Models
    Source: NREL
    Model the production cost for ethanol to assess its competitiveness and market potential; quantify the economic impact of individual conversion performance targets and prioritize these in terms of their potential to reduce cost. See also Design and Economics for Biochemical Conversion of Lignocellulosic Biomass to Ethanol.
    Biomass Scenario Model
    Source: National Renewable Energy Laboratory
    Model the integration of all aspects of the biomass supply chain from growing the feedstock through harvest, collection, transport, conversion, distribution of fuel, and consumption of fuel in vehicles.
    Policy Analysis System (Polysys)
    Source: Oak Ridge National Laboratory/University of Tennessee
    Model U.S. planning decisions at the level of the agricultural statistics district; crop demands and market prices at the national level; and the integrated livestock sector at the national level. Includes fourteen crops and five livestock commodities.

    Fuel Cells and Hydrogen

    Fuel Cell Power Model
    Source: National Renewable Energy Laboratory
    Analyze high-temperature, fuel cell-based tri-generation systems using a discounted cash flow rate-of-return methodology to determine the cost of delivered energy; quantify energy inputs/outputs and greenhouse gas emissions.
    Hydrogen Analysis (H2A)
    Source: National Renewable Energy Laboratory
    Perform economic analysis of forecourt (distributed) and central hydrogen production systems using various energy resources, including renewables, coal, natural gas, and biomass; calculate the delivered cost of hydrogen for a particular delivery component.


    Geothermal Electricity Technology Evaluation Model (GETEM)
    Source: National Renewable Energy Laboratory
    Model the estimated performance and costs of available U.S. geothermal power systems; analyze available technologies and estimate the cost of certain technologies 5-20 years in the future
    Other Geothermal Tools
    Source: Geothermal Technologies Program
    Use the tools on this list to find programs that model geothermal systems and economics.


    PVWatts Performance Calculator
    Source: National Renewable Energy Laboratory
    Access data sets and calculators to determine energy production and cost savings of grid-connected solar photovoltaic (PV) systems.
    Solar Prospector
    Source: National Renewable Energy Laboratory
    Access solar resource data—and other data relevant to utility-scale solar power projects—and map or site large-scale solar plants.

    Find technology-specific resources on EERE program websites.