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Ppa defaults updates#2217

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ppa_defaults_updates
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Ppa defaults updates#2217
brtietz wants to merge 2 commits into
developfrom
ppa_defaults_updates

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@brtietz

@brtietz brtietz commented Jun 18, 2026

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Increase default PPA prices and commercial electricity rates to produce positive NPVs given reduced tax credits. Also run defaults overwrite script to update calculated inputs, and propagate these to export config.

Principles:

  • Lead with detailed-PV. Aim for consistency in price for PVWatts and related models even if negative NPVs crop up due to lower generation
  • Aim for consistent prices between single owner, partnership flip, and sale leaseback

Notes:

  • Merchant plant and residential were not updated
  • NaN IRRs in partnership flip is due to high developer fees relative to developer equity. These were not changed from the previous release
  • Commercial energy prices are higher than previous, but lower than a small commercial rate in Xcel Colorado territory

@brtietz brtietz added this to the SAM 2026 Release milestone Jun 18, 2026
@brtietz brtietz requested a review from sjanzou June 18, 2026 16:45
@brtietz brtietz added the financial Financial model label Jun 18, 2026

@sjanzou sjanzou left a comment

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Results look reasonable with those you noted.

Maybe we need to re-evaluate after @cpaulgilman has a chance to review?

Comment thread test_results_win64.csv
Custom Generation Profile,Third Party,30274.6,NA,NA,;
Custom Generation Profile,Host Developer,73469696,15.9151,16.6656,;
Custom Generation Profile,Single Owner,756864000,15.9422,25.9936,; Warning: IRR at end of analysis period is not a number (NaN). This can indicate that revenues are too low to cover costs, or that they are excessively high compared to costs. Warning: IRR in target year is not a number (NaN). This can indicate that revenues are too low to cover costs, or that they are excessively high compared to costs. Warning: Debt percent is 367.051. A debt percent greater than 100% may indicate that revenues are higher than necessary to cover project costs.
Custom Generation Profile,Single Owner,756864000,14.761,15.1629,; Warning: IRR at end of analysis period is 147.887%. A high IRR may indicate a project with unrealistically high returns. Warning: IRR in target year is 147.888%. A high IRR may indicate a project with unrealistically high returns.

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seems like a large change in the LPPA_NOM... are we good to back up the changes for user questions?

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