Add new costs and adjust solar priors calculation

[daryaguettler]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.6%. Comparing base (cb9d45a) to head (ba264a5).

Files with missing lines	Patch %	Lines
epengine/models/inference.py	0.0%	33 Missing ⚠️

❌ Your project status has failed because the head coverage (24.6%) is below the target coverage (90.0%). You can increase the head coverage or adjust the target coverage.
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Additional details and impacted files

@@           Coverage Diff           @@
##            main     #35     +/-   ##
=======================================
- Coverage   24.7%   24.6%   -0.1%     
=======================================
  Files         36      36             
  Lines       4394    4411     +17     
  Branches     459     463      +4     
=======================================
  Hits        1089    1089             
- Misses      3260    3277     +17     
  Partials      45      45             

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