icon HOMER Pro Version History

This page contains the version history for HOMER Pro and the older HOMER versions upon which it was based. HOMER Grid version history is here.

Download the latest HOMER Pro version here.

HOMER Pro Version 3.16.2 (July 6, 2023)
    Features and Improvements
    • Corrected Issue with capacity shortage appearing incorrectly in the optimization table
    • Corrected Issue with operating reserves associated with the generator order controller
HOMER Pro Version 3.16.1 (June 27, 2023)
    Features and Improvements
    • Added ability to model electric load year 
    • Added an electrolyzer efficiency table 
    • Enabled the option for the grid to supply the electrolyzer  
    • View unmet hydrogen load in the simulation results hydrogen tab 
    • Corrected minimum load ratio issue
HOMER Pro Version 3.16.0 Beta (June 9, 2023)
    Features and Improvements
    • Added ability to model electric load year 
    • Added an electrolyzer efficiency table 
    • Enabled the option for the grid to supply the electrolyzer  
    • View unmet hydrogen load in the simulation results hydrogen tab 
    • Corrected minimum load ratio issue
HOMER Pro Version 3.15.3 (March 17, 2023)
    Features and Improvements
    • Corrected issue with incorrect currency 
    • Corrected antivirus security issue
HOMER Pro Version 3.15.2 (January 20, 2023)
    Features and Improvements
    • Context help popups  
    • Improved help documentation  
    • Improved temperature resource suggestion  
    • Corrected deferrable load total in Electrical tab  
    • Allowing the electrolyzer to run when it is required to serve the hydrogen load 
    • Turned off "Require year end tank level to equal or exceed.." so now this option is unchecked by default 
    • Corrected PV production negative values  
    • Corrected client proposal error  
    • Corrected battery throughput values in optimization results table  
    • Corrected Helioscope link   
    Improvements :
    • Yellow warning to tell user the Combined dispatch doesn't support hydrogen    
    • Adding unmet hydrogen to the Sim and Opt Results table 
    • Adding electrolyzer consumption to Electrical tab  
    • Adding option to export multiple timeseries from Optimization results   
HOMER Pro Version 3.14.5 (July 29, 2021)
    Features and Improvements
    • Changed Modified Kinetic Model to ASM for consistency
    • Upload key includes copy option
    • Corrected units in boiler library view
    • Corrected time series values vs. plotter values
    • Corrected PPA calculation at minute timesteps
    • Corrected hover over fuel units in monthly whisker plot
    • Corrected units for hydrogen load sensitivity
    • Corrected deferrable load scale for annual average in saved files
HOMER Pro Version 3.14.4 (December 14, 2020)
    Features and Improvements
    • Issue with modeling PV-dedicated inverter cost with DC-to-AC ratio sizing option
HOMER Pro Version 3.14.3 (November 13, 2020)
    Features and Improvements
    • Improved help documentation
    • Improved UX for selecting a base case
    • Issue with exporting multi-year csv in year-per-line format
HOMER Pro Version 3.14.2 (August 10th, 2020)
    Features and Improvements
    • Formatting and information in client report
    • Link to Windnavigator
    • Updated Help documentation
    • Time series plots in the report for multi-year
HOMER Pro Version 3.14.1 Beta (July 24, 2020)
    Features and Improvements
    New features:
    • Proposal Writer
    • Updated End User License Agreement
    • Issue with PVsyst imported data
    • Warning about generator minimum load for MATLAB
    • Generator Order fix
    • Issue modeling flywheel and battery depending on the order added to the model
HOMER Pro Version 3.14.0 (June 17, 2020)
    Features and Improvements
    New features:
    • DC: AC Ratio sizing option for PV-dedicated converter
    • Generator Initial Hours for wear at project start
    • NREL’s Intra-time Step Distribution Function is a new controller
    • Updated Resources from NREL and NASA
HOMER Pro Version 3.13.8 (March 18, 2020)
    Features and Improvements
    • Licensing issue with concurrent licenses (Error: "Library already initialized-1074 i")
HOMER Pro Version 3.13.7 (January 27, 2020)
    Features and Improvements
    • Issue with missing fuel in library
    • Issue with saving files under long path names
    • Issue with defining wind turbine maintenance schedule in library view
HOMER Pro Version 3.13.6 (January 3, 2020)
    Features and Improvements
    • Issue with Controller API SDK
    • Issue with Nalpeiron licenses: 1074 error
    • Issue with fuel summary metrics for sub-hourly time-step simulations
    • Issue with saving a file as during calculation
    • Crash when modeling custom component's power purchase agreement (PPA) feature
    • Crash with simulation report
    • Issue with checkbox to model battery string size
HOMER Pro Version 3.13.3 (September 6, 2019)
    Features and Improvements
    • MATLAB Link offers solar_forecast for simulation_parameters.pvs
    • Include the Renewable Energy section in the Simulation Report
    • Extra help links when encountering issues with Generator Order and Combined Dispatches
    • Issue with PV-dedicated converter's search space interacting with PV's search space
    • Issue for models with dispatchable generation sources and loads on both the AC and DC buses
HOMER Pro Version 3.13.2 (July 12, 2019)
    Features and Improvements
    • Fixed issue with opening homer file created in older versions
    • Fixed crash on adding custom logo in simulation report
HOMER Pro Version 3.13.1 (May 22, 2019)
    Features and Improvements
    • Add option in Settings to enable or disable the Welcome Screen upon program start
    • Added 'edge of space' warning for the storage component
    • Improvement to the Generator page and the Advanced Generator Settings
    • Minor text changes to the Start Tour
    • Minor UX fix for the Generator's complete catalog
    • Update HOMER Pro logo in the program installer
    • Fixed issue with crash on context help
HOMER Pro Version 3.13.0 (April 29, 2019)
    Features and Improvements
    New features:
    • Time Series Viewer
    • Results Summary Tab
    • Welcome Screen with shortcuts to the Start Tour, the Set-Up Assistant, and Sample Files
    • New logo
    • Improved UI for PV, generator, wind components and load page for synthetic loads
    • In the Results view, hide Sensitivity Table if no sensitivity variables
    • Improved resolution on the graphics in the Simulation Report
    • Fixed issue with maintenance schedule for storage, generator, custom component, wind work for multi-year
    • Fixed issue with the Grid component being one time-step off
    • Fixed issue with floating point error for deferable load
HOMER Pro Version 3.12.5 (February 6, 2019)
    Features and Improvements
    • Solar GHI resource graphic now includes legend
    • Improved performance when using Generator Order dispatch
    • User library components in the Complete Catalog are now identified in bold type
    • Fewer issues running HOMER on computers with anti-virus programs
    • Fixed issue with generator indexing for systems that include both multiple generators hydrogen
    • Fixed issues with canceling a calculation that resulted in creating unreadable files and user interface crashes
    • Fixed issue with producing a grid-only system when there are multiple entries for Purchase Capacity in the Grid component
    • Fixed missing labels in Grid tab of Simulation Results

HOMER Pro Version 3.12.4 (November 15, 2018)
    Features and Improvements
    • Improved Generator Order dispatch algorithm; removed unnecessary dependency
    • Fixed issue displaying synthetic load's peak (kW) after editing the load variability

HOMER Pro Version 3.12.3 (October 2, 2018)
    Features and Improvements
    • Fixed fuel consumption issue when comparing economics
    • Fixed issue with the text box not updating input information
    • Fixed issue with opening saved HOMER Pro file

HOMER Pro Version 3.12.2 (October 1, 2018)
    Features and Improvements
    • Improved ability to activate concurrent licenses on multiple computers
    • Added warning when a PV component with zero costs is used in conjunction with the optimizer
    • Added MAC address into License Manager page
    • MATLAB Link notes describe ability to support Grid capability
    • Fixed issue related to floating point error
    • Fixed issue with reporting the results' compare economics

HOMER Pro Version 3.12.1 (August 29, 2018)
    Features and Improvements
    New features:
    • Added context sensitive help links to explain climate zones
    • Added warning when using HOMER Predictive in conjunction with the Grid or other incompatible technologies
    • Fixed issue with concurrent license system
    • Link and logo of UtilityAPI is not included on the hydrogen and thermal load pages
    • Fixed issue related to the calculation restarting unnecessarily
    • Increased visibility of 'Send Me Information' button

HOMER Pro Version 3.12.0 (August 13, 2018)
    Features and Improvements
    New features:
    • Predictive Dispatch, which uses foresight to intelligently control batteries and generators
    • Electrical and thermal loads accessible for world-wide modeling, via climate-zone matching
    • Authenticated proxy support & improved concurrent license system
    • Customizable axes in graphical results
    • Ability to define the year in which an imported time series is taken
    • UtilityAPI suggestion added to load page

HOMER Pro Version 3.11.6 (May 7, 2018)
    Features and Improvements
    • Added new License Manager page
    • Added warning message for battery charge in connection with the grid
    • Unused biomass resource works when there is no biomass module
    • Ability for 'Import and Edit' feature to treat empty cells as gaps in the data
    • Issue with mixed languages
    • Issue with currency symbol in the generator page

HOMER Pro Version 3.11.5 (March 23, 2018)
    Features and Improvements
    • Issue with grid component's Real Time Rate control parameter for prohibiting grid sales below a certain price

HOMER Pro Version 3.11.4 (March 2, 2018)
    Features and Improvements
    • Ability to import HelioScope data that uses "," as a decimal separator

HOMER Pro Version 3.11.3 (January 25, 2018)
    Features and Improvements
    • Ability to add default components
    • Ability to copy items in library
    • Issue with Combined Dispatch controller handling unmet load

HOMER Pro Version 3.11.2 (December 19, 2017)
    Features and Improvements
    • Import and upload function for HelioScope files correctly converts W to kW

HOMER Pro Version 3.11.1 (December 12, 2017)
    Features and Improvements
    • Added over 120 components to the HOMER Pro Library
    • Ability for Combined Dispatch to work for models with no generators

HOMER Pro Version 3.11.0 Beta (November 28, 2017)
    Features and Improvements
    New features:
    • Integration with HelioScope's API provides ability to import data
    • New solar PV upload formats for PVsyst and HelioScope (.csv)
    • Added customizable colors for OST charts
    • Updated ROI calculation

HOMER Pro Version 3.10.3 (October 17, 2017)
    Features and Improvements
    • Multiple Component Library enhancements including changes to components available in quick-pick list and O&M information for select generators
    • Issue with opening *.homer file with flywheel
    • Table-based multiplier in year one of Multi-Year module is now used in calculations
    • Issue with Combined Dispatch control strategy converting excess power

HOMER Pro Version 3.10.2 (September 26, 2017)
    Features and Improvements
    • Wind Turbine Maintenance Schedule issues
    • Solar GHI Resource Internet connectivity issue
    • Issues with representation of PV size in plot
    • Ability to simultaneously use concurrent licensing
    • Ability to use Combined Dispatch Algorithm without generator(s)
    • Ability to compare project constraints and emissions within HOMER’s Compare Files feature
    • Splash screen typo
    • Removed Spanish text appearing within English HOMER Pro

HOMER Pro Version 3.10.1 (September 6, 2017)
    Features and Improvements

HOMER Pro Version 3.10.0 Beta (August 17, 2017)
    Features and Improvements
    New features:
    • New combined dispatch algorithm
    • Additional generic electrical load profiles for specific U.S. cities, with up to 16 different load profile types, including Hospital, Large/Small Office, Small Hotel, Warehouse, Restaurant, and more.
    • Ability to opt-in to receive product information directly from HOMER partners
    • Expanded component library
    • Increased flexibility in load data upload format
    • Multi-year degradation for custom component
    • Converters’ page enhancements
    • Matlab link includes an extra directory and name/value pairs
    • Improved simulation report
    • Changed default solar operating reserve to 80%
    • Added zinc bromide flow battery
    • Matlab-related error messages
    • Invalid dedicated converter efficiency table warnings
    • Optimizer error message reporting
    • Currency symbol display
    • Flywheel results
    • Hydrogen systems without reformer
    • Replacements in advanced storage model
    • Multibyte characters in user name

HOMER Pro Version 3.9.2 (June 20, 2017)
    Features and Improvements
    • Updated component names and images in library
    • Generators that produce fuel
    • Problem with multi-year
    • Partial Spanish showing up on some systems
    • Results recycling and fixed-sized generators
    • Custom components missing from Simulation Results
    • Custom component total production
    • Opening previous HOMER files

HOMER Pro Version 3.9.1 (May 31, 2017)
    Features and Improvements
    • Enabled saving for evaluation licenses
    • Added new library components into network library and updated others
    • Updated Matlab link to report programming errors thrown in matlab code
    • Registered X64 version as .homer file launcher
    • Biogas and hydrogen fuels bug
    • Time-series viewer
    • Bug with moving application window when calculating
    • Typo in Renewable section of reports
    • Removing components
    • ASM wear cost bug

HOMER Pro Version 3.9.0 Beta (May 15, 2017)
    Features and Improvements:
    • Performance improvements by utilizing AMD technology and Intel 64-bit processors
      • HOMER’s simulation and optimization engine runs up to 30% faster
    • New configurable reporting capabilities
      • Customize reports with company logo
      • Export report into PDF, DOCS, HTML, and RTF format
    • New help features
      • Search bar connects to HOMER’s online knowledge base
      • Context-sensitive help buttons connect specific terms to their appropriate help articles

HOMER Pro Version 3.8.7 (April 14, 2017)
    Features and Improvements
    • MATLAB Link reliability improved
    • Optimizer automatic upper limits improved
    Fixed issues related to:
    • Licensing problem with permanent licenses fixed
    • Renewable penetration results with biogas fixed
    • Multi-year csv export fixed
    • Resource time step 60 minute with project 15 minute timestep problem fixed

HOMER Pro Version 3.8.6 (March 23, 2017)
    Features and Improvements
    • Concurrent license file can be in the install directory
    • Optimizer upper limits automatically set for better results
    • Custom component upper optimizer limit always visible
    Fixed issues related to:
    • Fix for custom component PPA cash flow
    • Fix for storage loss reporting
    • Fixed advanced storage model for divide by zero crash

HOMER Pro Version 3.8.5 (March 9, 2017)
    Fixed issues related to:
    • Problem loading concurrent licenses

HOMER Pro Version 3.8.4 (March 2, 2017)
    Features and Improvements
    • Numerous updates and additions to the component library
    • CSV export for multi-year models
    • Improved application stability
    Fixed issues related to:
    • Fix for bug in some NREL solar data
    • Various bug fixes

HOMER Pro Version 3.8.3 (February 3, 2017)
    Features and Improvements
    • Improved stability when fitting a modified kinetic battery model in the library
    Fixed issues related to:
    • Bug fixes for the storage component dedicated converter, custom component dedicated converter, and generator order dispatch
    • Multiple bug fixes for the MATLAB Link modules
    • Bug fix for boiler component with thermal loads larger than 100 MW
    • Bug fix for cost boiler COE calculation in Multi-Year mode

HOMER Pro Version 3.8.1 (January 19, 2017)
    Features and Improvements
    • File>Save disabled for evaluation licenses
    • Added new license types (training, academic, student)
    • Added watermarks for simulation results and time series results
    • Improved the download license button for clarity
    • Added application telemetry for product improvement
    Fixed issues related to:
    • Multiyear crash fix in a time series plot case
    • Library crash fix for certain old components in users library
    • Dedicated converter bug for storage with simulation results
    • Fixed external dispatch to allow multiple generators
    • Fixed bug reading .hmr files
    • Remove duplicate entries in search space on calculate

HOMER Pro Version 3.8.0 Beta (November 30, 2016)
    Features and Improvements
    • New custom component – a non-dispatchable power source:
      • Built-in Library items: renewable, non-renewable, and Power Purchase Agreements (PPAs)
      • Using Matlab Link: implement your own custom power source in Matlab. (example of an ocean power source available)
      • Using SDK: implement your own custom power source in C++
    • Expanded component library: Many new generator, PV, wind turbine, converter and battery library options from a range of manufacturers
    • Updated samples: All new sample files (File > Samples) that demonstrate many of HOMER Pro's features
    • Improved library search: New search capability to find the component you’re looking for in storage, generator, PV, and wind turbine components
    • Advanced Grid module: Electric load #2 can be turned off when the grid is unavailable to allow you to model critical loads in Electric Load #1
    • Microgrid Controller SDK and Matlab Link expanded component and feature support:
      • Wind turbine
      • Advanced grid
    • Support for authenticated proxies
    • Improved warning display in the Results View
    • Improved usability and user interface (UI) enhancements throughout

HOMER Pro Version 3.7.6 (October 14, 2016)
    Features and Improvements
    Fixed issues related to:
    • Crash in multi-year time series viewer
    • Bug in renewable penetration results
    • Inappropriate "Model does not match results" message

HOMER Pro Version 3.7.4 (September 8, 2016)
    Features and Improvements
    • Improved Matlab Link error handling
    • Improved input validation
    Fixed issues related to:
    • Storage wear cost calculation in the advanced storage module
    • Crash upload bug
    • Extraneous error message when downloading a license
    • Problem with battery dedicated converters


HOMER Pro Version 3.7.3 (August 26, 2016)
    Features and Improvements
  • A bug fix release addressed:
    • Systems that include a thermal load controller sometimes crash
    • Systems that include flywheels produce incorrect warning messages
    • In multi-year simulations, Simulation Results were unavailable
    • The generator maintenance schedule could not be changed from the library
    • Systems with a grid that had more than 13 or more rates would crash


HOMER Pro Version 3.7.2 (August 17, 2016)
    Features and Improvements
  • Bug fixes for:
    • Small bug in a graph in the library editor for kinetic battery models
    • Fixes to variable listings for MATLAB Link in the help
    • Fix for optimizer with PV dedicated converters
    • Fix for wind turbine maintenance schedule


HOMER Pro Version 3.7.1 (August 1, 2016)
    Features and Improvements
  • Bug fixes addressed:
    • Adding and removing the Controller component sometimes causes funny UI behavior
    • Fix search space for dedicated converter in Storage
    • Improvements and corrections to Controller help articles
    • Add missing batteries back into library
    • Fixes for the Generator Order Controller
    • Fixes for the MATLAB Link Controller
    • Improve engine error messages for external controllers


HOMER Pro Version 3.7.0 (July 20, 2016)
    Features and Improvements
    • Microgrid Controller API for C++
    • Microgrid Controller API for MATLAB
    • Generator Order Controller
    • Bug fixes in cost tables, compare economics, and others


HOMER Pro Version 3.6.3 (July 11, 2016)
    Features and Improvements
  • Fixed problems related to:
    • Fix for crash in multi-year results plotting
    • Fix for units in multi-year results
    • Fix for some network configurations when user’s “My Documents” isn’t accessible


HOMER Pro Version 3.6.2 (June 23, 2016)
    Features and Improvements
    • New library components for Danvest generators and Canadian Solar PV
    • Fix for “Export All…” in results
    • Power curve for wind turbine and hydrokinetic automatically sorts
    • Fixed bug in library view of reformer
    • Fixed bug in compare economics
    • Fixed improper error when both batteries and flywheels are included in the model


HOMER Pro Version 3.6.1 (May 13, 2016)
    Features and Improvements
  • Fixed problems related to:
    • Wind turbine maintenance schedule
    • Input and output reports with new storage component
    • Wrong licensing window appearing on license expiration
    • Cash flow calculation in certain cases


HOMER Pro Version 3.6 (May 9, 2016)
    Features and Improvements:
  • New modules
    • Advanced Storage: Modified Kinetic Battery Model, degradation, temperature effects, rate-dependent losses
    • Multi-year: year-by-year results, yearly plot
  • Improved manufacturer information for components
  • Added maintenance schedule for batteries


HOMER Pro Version 3.5.4 (April 4, 2016)
    Features and Improvements
  • Completed Spanish localization
  • Fixed battery replacement and O&M costs in the wizard
  • Fixed maximum wind turbine cost for wizard
  • Added copy/paste behavior to tables in compare economics
  • Fixed crash when copying results to clipboard


HOMER Pro Version 3.5.3 (March 1, 2016)
    Features and Improvements
  • Fixed crash in wizard


HOMER Pro Version 3.5.2 (February 25, 2016)
    Features and Improvements
  • Improved progress bar for HOMER Optimizer™
  • Added warning message if the user gives invalid inputs to the PV dedicated converter
  • Corrected display of external dispatch parameters
  • Improved text for license download


HOMER Pro Version 3.5.1 (February 18, 2016)
  • Bug fix version


HOMER Pro Version 3.5 (February 10, 2016)
    Features and Improvements:
  • Improved tour
  • Introducing the HOMER Optimizer™ - a derivative-free optimization algorithm that significantly simplifies the design process
  • Various bug fixes and performance enhancements


HOMER Pro Version 3.4 (October 20, 2015)
    Features and Improvements:
  • Wizard with smart optimization
  • New plots of optimization space
  • Autosave
  • Detailed renewable penetration results
  • Expanded library ease of use
  • User can still enter latitude, longitude in location search without the internet
  • Various bug fixes and performance enhancements


HOMER Pro Version 3.3.3 (August 15, 2015)
    Features and Improvements:
  • Redflow batteries in component library
  • Spanish localization (beta)
  • Added requirement to have email address associated with product license
  • Changed exporting of load data so that it is scaled
  • Improved layout of wind resource page
  • Improved user interface performance for load data entry
  • Improved model error checking
  • Various bug fixes and performance enhancements


HOMER Pro Version 3.3.1 (August 07, 2015)
    Features and Improvements:
  • Added help for fuel resource
  • Added new error messages and user feedback for mistakes in the model
  • Various bug fixes and performance enhancements


HOMER Pro Version 3.3 (July 22, 2015)
    Features and Improvements:
  • Improvements to grid-connected microgrids and distributed generation systems
  • Improved demand charge modeling and the ability for battery systems to reduce peak demands
  • Demand limits can now be set monthly
  • Battery charging and discharging can be more directly controlled by time of day and month
  • More options for comparing systems with and without the grid
  • Usability improvements including better handling of multiple fuels
  • Better navigation in the time series plots
  • New shortcut buttons on the schematic
  • Improved optimization report
  • Number formatting improvements
  • Improved CSV export for international compatibility
  • Improved handling of duplicated values in sensitivity and optimization variables
  • Various bug fixes and performance enhancements


HOMER Pro Version 3.2.3 (June 12, 2015)
  • Implemented save to library for boiler
  • Fixed units for inverter and rectifier mean output
  • Fixed issue with PV dedicated inverter being inadvertently added
  • Fixed methodology for including grid results in simulations where purchase capacity is zero
  • Fixed crash when there are duplicated values in linked sensitivities
  • Improved OST and surface plots for models with duplicated values in linked sensitivities
  • Fixed crash when out of memory saving very large files
  • Improved error reporting for battery search space
  • Fixed header formatting in CSV exports
  • Added units to CSV files
  • Fixed crash when Windows isn’t configured with a default web browser
  • Fixed crash/bad save during file save
  • Fixed crash when generator doesn’t have a matching fuel in library


HOMER Pro Version 3.2.2 (May 19, 2015)
  • Leonics converters added to component library
  • Fixed bug when the number of linked sensitivities weren’t matched
  • Fixed bug with results recycling
  • Fixed bug with hydro results
  • Fixed bug where some temporary files were not being deleted


HOMER Pro Version 3.2.1 (May 8, 2015)
  • Supports authenticated proxy servers
  • Fixed engine hang for very small PV systems
  • Fixed inverter and rectifier capacity factor
  • Fixed when grid is down, battery is down also
  • Fixed fuel resource usage for timesteps other than 1 hour
  • Fixed load table paste from excel
  • Fixed crash in some cases with multiple simulation results windows open
  • COE now 3 decimal places
  • Fixed inverter and rectifier dmaps were swapped in results tab
  • Fixed name of grid in electrical tab
  • Fixed size of page in battery library editor


HOMER Pro Version 3.2 (April, 2015)
  • Unreliable grid added to Advanced Grid module, which allows for scheduled and unscheduled grid outages
  • Wind and temperature resources downloadable from internet
  • Auto-sizing generator
  • Improved support for one-minute time steps
  • 64-bit version available
  • Detailed and interpolated time series views
  • Improved library for creating custom components: battery, generator, PV, wind turbine, and hydrokinetic
  • Performance improvements for systems with a large optimization spaces


HOMER Pro Version 3.1.3 (March 2, 2015)
  • Improvements to license management page and diagnostics
  • Fixed bug with international character sets
  • Fixed battery maximum capacity issue
  • Improved battery designer lifetime table
  • Fixed linked sensitivities sorting
  • Improved the HTML report
  • Improved appearance of OST plot


HOMER Pro Version 3.1.2 (February 11, 2015)

  • Changes to battery model library
  • Grid default changes
  • Updated help
  • Corrected landing pages for software update
  • Fixed slope and azimuth in PV
  • Fixed wind turbine size in results table
  • Fixed problem comparer crash
  • Fixed crash when user tries to plot an uninitialized resource
  • Fixed update of table in grid scheduled rates view
  • Fixed invalid temperature causing infeasible results
  • Fixed currency symbol in cash flow table
  • Fixed issue loading file when the model does not match results
  • Fixed repeated imported file warnings with HOMER 2 linked sensitivities
  • Fixed electrical results tab for grid and hydro


HOMER Pro Version 3.1.1 (February 2, 2015)

  • Fixed bug generator heat recovery incorrectly routed through the thermal load controller
  • Fixed bug importing .hmr fuel curve only partially populated
  • Fixed bug geocoding and timezone services don't work in localels with "," as a decimal separator
  • Fixed crash when inputting data that can't be formatted as a number
  • Fixed bug handing certain input data for battery library
  • Fixed crash on saving a .csv file already open in another program
  • Fixed crash when downloaded solar resource data has problems
  • Fixed crash when user tries to plot an uninitialized resource
  • Fixed licensing bug for certain proxy environments
  • Fixed issue with generator scheduling in certain multiple generator cases
  • Fixed bug time series results graph y-axis labels may be cut off for numbers greater than 999
  • Fixed bug "Vanadium" type batteries, which allow seperate optimization spaces for cell stack size (kW) and electrolyte (kWh), can not be added to models with other types of batteries. The warning "Battery 'xyz' must allow for zero quantity" persists even if the search spaces include zeros.
  • Fixed bug copying/pasting load data from an external spreadsheet program into the hourly load profile table does not work.


HOMER Pro Version 3.1.0 (January 2015)

  • New features:
    • Linked sensitivities
    • Support for international currency and number formats
    • Ability to hide 3rd party ads in paid version
    • Compare 2 files
    • Improved plots and plotting options
    • Load efficiency
    • Results recycling (only recalculate when necessary - much faster performance)
    • Engine extensions - external dispatcher supporting PV and generators
    • Copy component from model to library
    • Improvements to wind turbine model
    • New battery designer with increased functionality over HOMER 2
  • New modules
    • Hydrogen: Hydrogen tank, electrolyzer, reformer, fuel cells, hydrogen load
    • Advanced grid: Real-time rates, schedule rates, scheduled outages, per-rate options, compare cost of grid extension to cost of hybrid system
  • New components
    • Windera turbine by Ennera
    • XANT M-21 wind turbine
    • Hydrokinetic turbine by Smart Hydro Power
    • Vanadium batteries with separate power and storage capacity space
  • Bug and cosmetic fixes:
    • Improved licensing system - no download required
    • Missing display of weekend or weekday data separately in the load menu
    • Checkbox for "Enforce Minimum Renewable Fraction" in the Constraints menu doesn't do anything
    • Time series results x-axis labels and ticks don't line up with the data
    • Cannot move batteries from HOMER 2 to HOMER Pro
    • Ads cannot be turned off
    • Setting the PV dedicated converter lifetime to zero years causes the simulation to fail
    • If you change the name of a user-defined library component, you will not be able to add more instances of that component.
    • If you select "consider temperature effects" with a concentrating PV panel, HOMER will give an error when trying to produce the detailed simulation results.
    • HOMER Pro will not allow calculation with a thermal load but no electric load

HOMER Pro Version 3.0.9 (December 2014)

  • New feature:
    • Added grid purchases and sales
  • Bug fixes:
    • PV dedicated converter size incorrect
    • Grid prices aren’t saved
    • Empty PV dedicated search space bug
    • Summary results units incorrect
    • Incorrect “Add a converter” message
    • Corrected solar resource update button behavior
    • Improved wind turbine help message
    • Load scaled annual average not saved
    • Fixed graphic results crash
    • Changed default for Inverter Parallel With Generator to true
    • Improved license failure information

HOMER Pro Version 3.0.8 (November 2014)

  • Bug fixes:
    • Crash in some cases for customers running with non-US style numeric separators
    • Crash in some cases for customers running Windows 8 and a touch screen
    • Edge of space simulation warnings for PV
    • Changed “professional” to “pro” everywhere and updated logos
    • Changed how solar resources are accessed so we can differentiate between HOMER 2 and HOMER Pro use
    • Updated license file

HOMER Pro Version 3.0.7 (October 2014)
This is a completely new product that replaces HOMER 2 as the primary HOMER product.

  • 2 Northern Power wind turbines
  • 1 Norvento turbine
  • 4 Innovus generators
  • Enerstore flow battery
  • 15 Cellcube batteries
  • 9 Discover batteries
  • New design and architecture:
    • Crisp new design and navigation system
    • New library options for managing components, loads, and resources
    • Modular licensing — use only what you need
    • Faster parallel processing architecture
  • Improvements to solar systems:
    • Up to 10 solar arrays
    • Dedicated converters
    • Expanded maximum power point tracker capabilities
    • Concentrating PV and DNI resource
    • Map-based solar data download
  • Improvements to wind:
    • Temperature effect on wind resource
    • Data gap filling in wind; Windographer file import
    • Maintenance scheduling
  • Generator maintenance scheduling
  • Faster and easier ways to simulate common load types
  • Battery minimum state of charge sensitivity
  • Sort and filter results on any column

HOMER 2 Version 2.81 r3 (July 2014)
Version 2.81 r3 added:

  • 15 new Gildemeister batteries
  • These are available to HOMER 2 users as expansion packs without reinstall. Visit the HOMER Users Site and select Download/Purchase->Free Add-ons to add these new components to your local copy of HOMER 2

HOMER 2 Version 2.81 r2 (March 2014)
Version 2.81 r2 added:

  • 2 new Vergnet wind turbines
  • These are available to HOMER 2 users as expansion packs without reinstall. Visit the HOMER Users Site and select Download/Purchase->Free Add-ons to add these new components to your local copy of HOMER 2

HOMER 2 Version 2.81 r1 (February 2014)
Version 2.81 r1 added:

  • 10 new Trojan battery models
  • 5 new Bergey wind turbines
  • These are available to HOMER 2 users as expansion packs without reinstall. Visit the HOMER Users Site and select Download/Purchase->Free Add-ons to add these new components to your local copy of HOMER 2

>HOMER 2 Version 2.81 (November 8, 2010)
Version 2.81 includes the following feature updates and fixes:

  • Revised properties of Beacon Power SE25 flywheel
  • Allowed synthetic wind data to have any time step down to one minute.
  • Fixed bug in generator XML import logic.

HOMER 2 Version 2.80 (September 28, 2010)
Version 2.80 includes the following feature updates and fixes:

  • Allowed synthetic load data to have any time step down to one minute.
  • Allowed synthetic wind data to have any time step down to one minute.
  • Revised equation for renewable penetration.
  • Added Beacon Power Smart Energy 25 flywheel to component library.
  • Fixed bug causing HOMER to miscalculate the flywheel parasitic load in systems comprising two or more flywheels.

HOMER 2 Version 2.77 (September 8, 2010)
Version 2.77 fixes two bugs, one relating to VRB and ZBB type batteries, and one relating to electrolyzers. If you model systems that contain these components, we recommend that you update to the latest version.

  • Changed the Battery Inputs window to ensure that VRB and ZBB batteries have a ‘string size’ of one.
  • Fixed a bug that caused the battery to discharge to serve the electrolyzer at inappropriate times in off-grid systems that contain both a battery and a hydrogen storage system.

HOMER 2 Version 2.76 (June 23, 2010)

  • Fixes a bug related to batteries that do not use the kinetic battery model
  • Added the Beacon Power Smart Energy 25 flywheel to the list of batteries in the component library
  • Fixed a bug that prevented the HTML and XML reports from appearing.

HOMER 2 Version 2.75 (April 23, 2010)

  • Added the ability to model a flywheel.
  • Added ability to model ZBB type batteries.
  • Made battery capacity curve optional when specifying the properties of a new battery.
  • Made battery lifetime curve optional when specifying the properties of a new battery.
  • Added battery initial state of charge variable.
  • Added the ability to schedule the operation of the electrolyzer.
  • Added solar altitude, solar azimuth, and angle of incidence to hourly simulation results for all PV systems.
  • Fixed bug in vertical-axis PV tracking logic causing erroneously low PV power output in tropical latitudes.
  • Fixed bug that occasionally prevented HTML report from appearing in Firefox.

HOMER Legacy Version 2.68 (July 24, 2009)

  • Updated contact information to reflect the licensing of HOMER from NREL to HOMER Energy, LLC.

HOMER Legacy Version 2.67 (April 21, 2008)

  • Added the ability to model up to ten generators.
  • Added the ability to compete up to ten battery types against each other.

HOMER Legacy Version 2.64 (December 27, 2007)

  • Added battery string size.
  • Added energy in, energy out, and losses to the battery tab of Simulation Results window.
  • Added delta plot to the Hourly tab of the Simulation Results window
  • Updated cost summary section of the HTML system report.

HOMER Legacy Version 2.63 (November 30, 2007)

  • Added the ability to model the temperature effect on the PV array.
  • Added the ability to import solar radiation and temperature data from TMY2 files.
  • Made the reformer and the electrolyzer capable of supplying hydrogen to a generator as needed to serve an electric load.
  • Added the ability to limit the excess thermal output.
  • Added a constraint on net grid purchases.
  • Added checkbox to System Control window allowing two types of wind turbines in a single system.
  • Added a second thermal load.
  • Added a new grid/battery control parameter prohibiting any battery charging above a certain grid power price.

HOMER Legacy Version 2.52 (August 31, 2007)

  • Fixed bug that prevented the Plot button from working in the load and resource input windows.
  • Fixed bug that caused incorrect calculation of grid sales in some grid-connected systems.

HOMER Legacy Version 2.5 (July 20, 2007)

  • Added operating cost to Optimization Results and Simulation Results.
  • Added rated power to wind turbine properties.
  • New ability to calculate primary energy savings.
  • New Cost Summary tab in the Simulation Results window.
  • New scatterplot window to the Simulation Results window.
  • New Compare Economics window, which calculates payback, ROI, and IRR.
  • New ability to forecast wind power sales to the grid, and calculate resulting imbalance penalties when actual sales deviate from the forecasts.

HOMER Legacy Version 2.42 (May 21, 2007)

  • Added a graph to the cash flow window.

HOMER Legacy Version 2.41 (May 10, 2007)

  • Added the ability to simulate the system using any time step down to 1 minute.
  • Added the ability to import time series data with any time step down to 1 minute.
  • Added window showing the cash flow over the lifetime of the project.
  • Changed cost of energy equation denominator to exclude grid sales.
  • Changed calculation of PV power output to eliminate twilight power spikes.
  • Changed PV derating factor from 90% to 80%.
  • Fixed bug in solar azimuth calculation, which caused errors with tracking in the tropics.
  • Added two control parameters for grid/battery systems.
  • Made the grid stop charging the battery bank when it reaches the setpoint state of charge.
  • Improved hourly results table and export file to show date/time rather than hour of year.
  • Changed wind turbine power curve to accept two decimal places in wind speed.
  • Fixed the bug that caused the y-axis label to disappear in metafiles copied from graphs.
  • Allowed manual setting of graph axes.
  • Allowed manual override of graph colors.
  • Implemented new click-and-drag zoom feature in time series graphs.

HOMER Legacy Version 2.2 (October 26, 2005)

  • Added ability to model flow batteries.
  • Added ability to connect the PV panel to the AC bus.
  • Allowed real-time (hourly) grid power pricing.
  • Added threshold power price above which grid will not charge battery bank.
  • Added threshold sellback rate below which the system will not sell power to the grid.
  • Allowed hydrogen demand to be specified hourly.
  • Added calculation of levelized cost of hydrogen.
  • Changed formula for battery energy cost to account for discharge efficiency.
  • Added fixed and marginal generation cost to generator page of Simulation Results window.
  • Added battery wear and energy cost to battery details page of Simulation Results window.

HOMER Legacy Version 2.19 (June 14, 2005)

  • Fixed bug causing some infeasible deferrable load-serving systems to be counted as feasible.

HOMER Legacy Version 2.18 (June 1, 2005)

  • Fixed bug in renewable fraction equation causing an incorrect calculation when excess electricity served the thermal load.
  • Fixed bug preventing browser launch with Firefox as default browser.
  • Added constraints, emissions, and generator control sections to the HTML input report.
  • Added excess electricity to monthly thermal production graph.

HOMER Legacy Version 2.17 (May 16, 2005)

  • Fixed bug causing boiler emissions costs to be double counted in calculation of total net present cost.
  • Changed equation for levelized cost of energy to subtract the cost associated with serving the thermal load.

HOMER Legacy Version 2.16 (April 8, 2005)

  • Fixed bug preventing HOMER from recalculating results after a change to the grid rate schedule.
  • Fixed bug preventing HOMER from recalculating results after a change to the emissions constraints.

HOMER Legacy Version 2.15 (April 5, 2005)

  • Made the units of the emissions factors on the Boiler Inputs window correspond to the fuel units.
  • Fixed a problem that prevented the creation of the HTML report before the document was saved to disk.

HOMER Legacy Version 2.14 (January 25, 2005)

  • Fixed several bugs in the XML import facility.
  • Changed to new kind of install file created with Inno Setup. This avoids the error that occurred when running the old install file on some versions of Windows stating "The system file is not suitable for running MS-DOS and Microsoft Windows applications."

HOMER Legacy Version 2.13 (December 16, 2004)

  • Fixed bug where HOMER did not properly consider the emissions costs when controlling dispatchable power sources.
  • Fixed bug causing incorrect column headings in text export of the tabular sensitivity results table.

HOMER Legacy Version 2.12 (December 13, 2004)

  • Fixed bug where total electrical production value excluded grid purchases.
  • Fixed bug causing erroneous extraterrestrial solar radiation calculation at midnight in polar latitudes during 24 hours of daylight.

HOMER Legacy Version 2.11 (December 1, 2004)

  • Added Furhländer and Windside wind turbines to the default component library.
  • Added Hoppecke and Vision batteries to the default component library.
  • Fixed bug in pie charts where legend occasionally disappeared.
  • Added Import XML button to Create New Battery window.
  • Fixed a few minor interface problems in the Create New Battery window.
  • Changed HTML input summary to show annual average load profile rather than January load profile.
  • Improved the FAQ page in the help file.

HOMER Legacy Version 2.10 (November 8, 2004)

  • Changed calculation process to avoid recalculating existing results. This can dramatically reduce run times.
  • Added ability to specify daily, weekly, and seasonal variations in grid power cost.
  • Added ability to schedule generator operation.
  • Added link to solar resource database.
  • Added ability to calculate, penalize, and limit emissions of CO2, CO, SO2, NOx, particulate matter, and unburned hydrocarbons.
  • Added fuel curve calculator window.
  • Added HTML reports summarizing inputs and simulation results.
  • Added XML import/export capability.
  • Added ability to create spider graphs of sensitivity results.
  • Added ability to model an external hydrogen load and a steam reformer.
  • Added variable for initial hydrogen tank level.
  • Added constraint on final hydrogen tank level.
  • Replaced wind speed scaling factor with anemometer height and turbine hub height.
  • Replaced power curve scaling factor with altitude.
  • Added additional pages to Simulation Results window showing detailed operation of the wind turbine, hydro turbine, PV array, hydrogen tank.
  • Fixed bug in net metering logic causing incorrect calculation of annual energy charge.
  • Fixed bug causing incorrect economic calculations when the interest rate was zero.
  • Fixed bug causing unmet load in setpoint mode with undersized generator.

HOMER Legacy Version 2.09 (February 18, 2004)

  • Fixed bug that in some situations caused HOMER to ignore the battery setpoint state of charge.

HOMER Legacy Version 2.08 (February 11, 2004)

  • Fixed bug that in some instances caused HOMER to be unable to initiate a license.

HOMER Legacy Version 2.07 (January 15, 2004)

  • Fixed a bug where HOMER considered electricity produced by a hydrogen-fuelled generator to be non-renewable. HOMER now considers such electricity to be 100% renewable.
  • Fixed a problem with the behavior of generators fuelled by stored hydrogen and operating under the cycle charging dispatch strategy.
  • Fixed a calculation error that occurred when a generator operating under the influence of a setpoint state of charge ran out of fuel.
  • Added the ability to graph the amount of hydrogen in the storage tank.

HOMER Legacy Version 2.06 (October 21, 2003)

  • Fixed bug relating to the calculation of carbon emissions.

HOMER Legacy Version 2.05 (August 26, 2003)

  • Added the ability to import .tpc files into the Create New Wind Turbine window.

HOMER Legacy Version 2.04 (August 5, 2003)

  • Fixed bug that could cause HOMER to crash when opening a file containing fewer than 8760 hours of primary load data.

HOMER Legacy Version 2.03 (July 30, 2003)

  • Fixed bug in grid sales logic.

HOMER Legacy Version 2.02 (July 24, 2003)

  • Fixed bug causing Search Space Usage window to crash in certain circumstances.

HOMER Legacy Version 2.01 (July 22, 2003)

  • Fixed bug in deferrable load logic.

HOMER Legacy Version 2.0 (July 10, 2003)

  • Added ability to model grid-connected systems.
  • Added ability to model both AC and DC electric loads.
  • Added ability to model thermal loads and combined heat and power.
  • Added ability to model as many as three generators.
  • Added ability to model electrolyzers, hydrogen storage, and hydrogen-fueled generators.
  • Added ability to model operating reserve.
  • Added a clickable schematic diagram to the main window.
  • Redesigned all input windows.
  • Rewrote battery module and allowed battery bank size to be specified in terms of number of batteries, rather than kWh of nominal capacity.
  • Allowed generators to be fueled by pure biogas
  • Added carbon tax.

HOMER Original Version 1.58 (March 26, 2002)

  • Fixed bug causing certain systems to be mistakenly omitted.
  • Changed default wind turbine lifetime from 20 yrs to 15 yrs.
  • Changed default biomass carbon content from 50% to 0%.
  • Changed default battery maximum charge rate from 1 A/Ah to 0.1 A/Ah.
  • Changed default real interest rate from 10% to 6%.

HOMER Original Version 1.57 (October 24, 2001)

  • Minor bug fix.

HOMER Original Version 1.56 (October 3, 2001)

  • Minor bug fix.

HOMER Original Version 1.55 (September 13, 2001)

  • Increased length of temporary license from 60 to 180 days.

HOMER Original Version 1.54 (September 12, 2001)

  • Made the PV slope and azimuth default to values appropriate to the latitude.

HOMER Original Version 1.53 (September 11, 2001)

  • Changed default hourly and daily noise values to 15% and 25%.

HOMER Original Version 1.52 (June 22, 2001)

  • Added ability to copy and save graphic images in metafile format.
  • Made symbol size and line width in graphics configurable by user.

HOMER Original Version 1.51 (June 6, 2001)

  • Added asterisk to the document title when modified.
  • Added version number and remaining days to the splash screen.

HOMER Original Version 1.5 (May 11, 2001)

  • Added ability to model small modular biomass systems.
  • Improved procedure for fitting kinetic battery model constants to a discharge curve.
  • Added capability to identify file version of an invalid-format .hmr file.
  • Changed units of output variable carbon emissions to t/yr from kg/yr.
  • Improved scroll bar operation and eliminated flicker in time series plots.

HOMER Original Version 1.4 (March 1, 2001)

  • Added capability to model small hydro systems.
  • Changed image file format from bitmap to PNG (Portable Network Graphics).
  • Added protection from low values of Kt in the solar data generation algorithm.
  • Fixed bug causing crash when writing large .hmr files.

HOMER Original Version 1.3 (November 9, 2000)

  • Stored hourly values of inverter power and rectifier power.
  • Added primary load efficiency analysis capability.
  • Added linked sensitivities.

HOMER Original Version 1.2 (July 31, 2000)

  • Changed to compressed binary .hmr file format.
  • Included imported load and resource data in the .hmr file.
  • Added maximum diesel run time and minimum battery life constraints.
  • Added carbon emissions.
  • Allowed the resorting of the sensitivity results list control.

HOMER Original Version 1.1 (June 27, 2000)

  • Added superimposed variable to surface plots and OST graphs.
  • Added ability to simulate on demand so all systems appear to have hourly data.

HOMER Original Version 1.0 (February 14, 2000)