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HOMER Pro Release Notes

Version history and changelogs.

Version 3.18.5 August 28, 2026
  • A key addition in both products is Storage Degradation Tables, providing a more flexible framework for modeling battery degradation based on manufacturer warranties and performance guarantees. Users can now define degradation trajectories by year, incorporate warranty curves for different annual cycling levels, and choose how degradation is interpreted between operating conditions, enabling project assumptions to better reflect actual battery supplier commitments.
  • Complementing this capability, Battery Augmentation Modeling allows users to add new storage capacity throughout the project lifetime. This reflects the growing industry practice of augmenting battery systems to offset degradation and maintain energy and capacity commitments over the life of the asset.
  • More accurate battery wear-cost calculations to better reflect lifecycle impacts.
  • Improved demand-charge calculations for commercial and industrial applications.
  • Enhanced generator fuel consumption modeling across different fuel units.
  • More reliable multi-year Cost Summary exports to Excel.
  • Full use of all optimizer variables when working with custom components.
  • Improved Setup Assistant stability
Version 3.18.4 November 13, 2024
  • Updated UI – New ULTRUS logo
Version 3.18.3 July 25, 2024

Issues

  • Fixed issue where new release download was being blocked by Windows Defender.
Version 3.18.2 July 16, 2024

Issues

  • Fixed location search not working properly
Version 3.18.1 April 1, 2024

Issues

  • Fixed Generating engineering detail report crashing
  • Fixed opening projects directly from file explorer or downloads crashing
  • Fixed Excess Electricity table missing
Version 3.18.0Beta February 1, 2024

Features

  • Added HOMER optimizer to electrolyser.
  • Added context help.
  • Added feature request button to interface.

Improvements

  • Fixed the optimization sizing to Hydrogen load: Fix optimizer sizing to work same way for hydrogen load as it does for electric load.
  • Fixed emissions calculation to use emissions factor instead of energy purchase.
  • Added multiyear escalators for replacement and O&M costs for the following: Custom, Hydro, Hydrokinetic, PV dedicated converter
  • Fixed client proposal report not including battery replacement costs
  • Corrected cashflow table in simulation results missing zeros and line item.
  • Fixed energy efficiency not working.
Version 3.17.1 December 15, 2023

Features

  • Added multi-year escalation for O&M and replacement costs for several components
  • Added new in app context help pop-ups

Improvements

  • Corrected issue with cash flow missing zeros and line items
  • Corrected issue with energy efficiency
  • Corrected issue with battery replacement not appearing in engineering report
  • Corrected issue with emissions calculations with net metering
Version 3.17.0 November 8, 2023

Features

  • Added multi-year escalation for O&M and replacement costs for several components

Improvements

  • Corrected issue with cash flow missing zeros and line items
  • Corrected issue with energy efficiency
  • Corrected issue with battery replacement not appearing in engineering report
  • Corrected issue with emissions calculations with net metering
Version 3.16.2 July 6, 2023

Issues

  • Corrected Issue with capacity shortage appearing incorrectly in the optimization table
  • Corrected Issue with operating reserves associated with the generator order controller
Version 3.16.1 June 27, 2023

Features

  • 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

Improvements

  • Corrected minimum load ratio issue
Version 3.16.0Beta June 9, 2023

Features

  • 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

Improvements

  • Corrected minimum load ratio issue
Version 3.15.3 March 17, 2023

Issues

  • Corrected issue with incorrect currency
  • Corrected antivirus security issue
Version 3.15.2 January 20, 2023

Issues

  • Context help popups
  • Improved help documentation
  • Improved temperature resource suggestion

Fixes

  • 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 Simulation and Optimization Results table
  • Adding electrolyzer consumption to Electrical tab
  • Adding option to export multiple timeseries from Optimization results