Itc basis updates#2187
Conversation
avoid < 0 error msg
…itc_basis_updates
allocation options, update callbacks
…itc_basis_updates
…itc_basis_updates
…attery, and custom generation battery
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@brtietz, @mjprilliman @sjanzou: I finished my work on the UI -- please test and let me know if you have feedback. |
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New UI looks good, thanks Paul! The latest updates extend this functionality (and detailed depreciation) to commercial. Please test when you get a chance. |
sjanzou
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sjanzou
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Version upgrade works great and configurations run.
Issues
- Send to Excel with Equations for PV-Batt-Com has error message
- Send to Excel with Equations for PVWatts-SO has error message
- (Probably a separate issue) IPH-MS-Liner-Fresnel-LCOH requires going through all forms before running - seems to be a left over issue from 2025.4.16.
Project files used to upgrade and test
| "batt_replacement_option": 1, | ||
| "batt_replacement_schedule_percent": [0.000000], | ||
| "batt_surface_area": 1227.67, | ||
| "batt_surface_area": 18000, |
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Kind of large surface area changes for the battery - is that expected?
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This is a downstream change from https://github.com/NatLabRockies/SAM/pull/2185/changes, sorry for not updating the computed defaults in that PR!
| sl_39 = oldvalue('depr_alloc_sl_39_percent'); | ||
| custom = oldvalue('depr_alloc_custom_percent'); | ||
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| value('ui_depr_alloc_macrs_5_percent', macrs_5, "Copying existing allocation to new UI variable."); |
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My previous question answered and working for old files for me.
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Send to Excel with Equations for PV-Batt-Com has error message
In my tests, I don't get an error, but the metrics in Excel do not match those in the SAM metrics table.
…how empty variable names. Also fix some variables set to "Default" UI widget.
sjanzou
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Upgrade working with the intermittent issue with the IPH Lin Fres - Com configuration per the SAM meeting 5/27/2026. All other tests are working for me... Maybe another round of testing once all the defaults are updated? Separate pull request?
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Pull Request Template
Description
Add new functionality to specify ITC and depreciation bases by technology installed cost. Update defaults to match post OBBBA phase outs (for projects that start construction after July 4th 2026 and don't enter operation before Dec 31 2026). Add bonus depreciation.
Help updates will be completed in parallel with feature reviews.
Expect many negative NPVs. PPA prices will be updated in a future PR.
References:
-General: https://fbtgibbons.com/one-big-beautiful-bill-act-cuts-the-power-phase%e2%80%91outs-foreign%e2%80%91entity-restrictions-and-domestic-content-in-clean%e2%80%91energy-credits/
Corresponding branches and PRs:
itc_basis_updates on ssc (NatLabRockies/ssc#1395)
Develop on other branches.
Unit Test Impact:
Test results changed due to tax credit defaults and default depreciation bases changes.
Checklist