Gridpath

What's Changed
* **Bugfix**: Fix parallelization with iterations but no subproblems by anamileva in https://github.com/blue-marble/gridpath/pull/1219
* **Feature**: Adjust max allowed horizon flows based on exog and threshold inflows by anamileva in https://github.com/blue-marble/gridpath/pull/1221
* **Feature**: Track and constrain reservoir ending volumes by anamileva in https://github.com/blue-marble/gridpath/pull/1223
* **Enhancement**: Additive bt-hrz derates by anamileva in https://github.com/blue-marble/gridpath/pull/1224
* **Bugfix**: Fix inefficient creation of tmp from bt-hrz availability params by anamileva in https://github.com/blue-marble/gridpath/pull/1225
* **Bugfix**: Various fixes to CSV inputs handling with iterations by anamileva in https://github.com/blue-marble/gridpath/pull/1226


**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v2025.3.0...v2025.4.0

What's Changed
* **Feature**: Add horizon average flow constraints by anamileva in https://github.com/blue-marble/gridpath/pull/1209
* **Feature**: Flow ramp limits by anamileva in https://github.com/blue-marble/gridpath/pull/1210
* **Enhancement**: Fully implement release and spill bounds by anamileva in https://github.com/blue-marble/gridpath/pull/1211
* **Enhancement**: Improve query efficiency by anamileva in https://github.com/blue-marble/gridpath/pull/1212
* **Enhancement**: Optionally allow violations of some reservoir constraints by anamileva in https://github.com/blue-marble/gridpath/pull/1213
* **Feature**: Total outflow limits by anamileva in https://github.com/blue-marble/gridpath/pull/1214
* **Feature**: Support soft horizon flow constraints by anamileva in https://github.com/blue-marble/gridpath/pull/1215
* **Feature**: Horizon availabilities by anamileva in https://github.com/blue-marble/gridpath/pull/1216


**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v2025.2.0...v2025.3.0

What's Changed
* **Enhancement**: Allow negative inflows by anamileva in https://github.com/blue-marble/gridpath/commit/731fc373956ed0eba01aeff542ee5cbcbe9989c6
* **Feature**: Add 'constant' elevation type by anamileva in https://github.com/blue-marble/gridpath/pull/1204
* **Bugfix**: Tx availability fixes to work with iterations by anamileva in https://github.com/blue-marble/gridpath/pull/1206
* **Bugfix**: Iterations directory structure -- various fixes by anamileva in https://github.com/blue-marble/gridpath/pull/1207

**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v2025.1.0...v2025.2.0

What's Changed
* **Bugfix**: Add simflow test example and bugfix by anamileva in https://github.com/blue-marble/gridpath/pull/1172
* **Major Feature**: Water system hydropower by anamileva in https://github.com/blue-marble/gridpath/pull/1174
* **Feature**: Add hydro iteration index to market prices by anamileva in https://github.com/blue-marble/gridpath/pull/1178
* **Feature**: Flexibly define whether market prices vary with iterations by anamileva in https://github.com/blue-marble/gridpath/pull/1179
* **Feature**: Market prices by market and iteration type by anamileva in https://github.com/blue-marble/gridpath/pull/1181
* **Feature**: Var gen profiles by hydro iteration by anamileva in https://github.com/blue-marble/gridpath/pull/1182
* **Feature**: Variable cost by timepoint by anamileva in https://github.com/blue-marble/gridpath/pull/1183
* **Feature**: Energy projects by anamileva in https://github.com/blue-marble/gridpath/pull/1184
* **Major Feature**: Load components by anamileva in https://github.com/blue-marble/gridpath/pull/1176
* **Feature**: Potential for energy product projects by anamileva in https://github.com/blue-marble/gridpath/pull/1185
* **Feature**: Energy slice horizon shaping optype by anamileva in https://github.com/blue-marble/gridpath/pull/1186
* **Feature**: Energy project group limits by anamileva in https://github.com/blue-marble/gridpath/pull/1187
* **Feature**: Generic policy by anamileva in https://github.com/blue-marble/gridpath/pull/1188
* **Feature**: Support default load levels for each LZ-component by anamileva in https://github.com/blue-marble/gridpath/pull/1190
* **Feature**: Support partial contribution to sim flow constraints by anamileva in https://github.com/blue-marble/gridpath/pull/1191
* **Enhancement**: Various tweaks to hydro water system functionality by anamileva in https://github.com/blue-marble/gridpath/pull/1194
* **Enhancement**: Various fixes to hydro water functionality by anamileva in https://github.com/blue-marble/gridpath/pull/1195
* **Major Feature**: GridPath Data Toolkit by anamileva in https://github.com/blue-marble/gridpath/pull/1169
* **Enhancement**: Better support for True/False Data Toolkit script arguments by anamileva in https://github.com/blue-marble/gridpath/pull/1197
* **Bugfix**: No default seeding and bugfixes in iteration CSV creation by anamileva in https://github.com/blue-marble/gridpath/pull/1198
* **Feature**: Support soft flow constraints by anamileva in https://github.com/blue-marble/gridpath/pull/1199
* **Enhancement**: Reformulate target releases in terms of average flow by anamileva in https://github.com/blue-marble/gridpath/pull/1200
* **Enhancement**: More efficiently build inflow and outflow expressions by anamileva in https://github.com/blue-marble/gridpath/pull/1201
* **Enhancement**: Load components fixes and better tests/docs by anamileva in https://github.com/blue-marble/gridpath/pull/1202

**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v2024.2.0...v2025.1.0

What's Changed
* **Enhancement**: Automatically generate opchar matrix image from CSV, and other doc fixes by milindsmart in https://github.com/blue-marble/gridpath/pull/1108
* **Enhancement**: Allow soft unavailable hours per period constraint by anamileva in https://github.com/blue-marble/gridpath/pull/1105
* **Enhancement**: Variable costs by period by anamileva in https://github.com/blue-marble/gridpath/pull/1107
* **Bugfix**: Fix get_inputs_from_database for reserves percent requirements by Janie115 in https://github.com/blue-marble/gridpath/pull/1120
* **Bugfix**: Fix get_inputs_from_database for elcc surface facets by Janie115 in https://github.com/blue-marble/gridpath/pull/1121
* **Bugfix**: Fix get_inputs_from_database for carbon credits params AND avoid trying to load info from project_carbon_credits.tab if the file does not exist by Janie115 in https://github.com/blue-marble/gridpath/pull/1122
* **Bugfix**: Fix to carbon credit purchase inputs by Janie115 in https://github.com/blue-marble/gridpath/pull/1128
* **Bugfix**: Fixes to capacity transfers inputs by Janie115 in https://github.com/blue-marble/gridpath/pull/1126
* **Enhancement**: Add USE threshold for RA statistics by anamileva in https://github.com/blue-marble/gridpath/pull/1134
* **Enhancement**: Support single iterations with non-0 ID by anamileva in https://github.com/blue-marble/gridpath/pull/1141
* **Maintenance**: Refactor loading of model data by anamileva in https://github.com/blue-marble/gridpath/pull/1143
* **Maintenance**: Reformulate gen_var optype by anamileva in https://github.com/blue-marble/gridpath/pull/1144
* **Enhancement**: Actually allow var negative power by anamileva in https://github.com/blue-marble/gridpath/pull/938
* **Maintenance**: Make all objective functions dictionaries for testing by anamileva in https://github.com/blue-marble/gridpath/pull/1145
* **Enhancement**: Performance standards in t/MW by Janie115 in https://github.com/blue-marble/gridpath/pull/1146
* **Bugfix**: Fix db_schema for relative capacity by Janie115 in https://github.com/blue-marble/gridpath/pull/1150
* **Bugfix**: Fixes in transmission targets by Janie115 in https://github.com/blue-marble/gridpath/pull/1155
* **Bugfix**: Fix get hydro op chars and tmp opr inputs from db by Janie115 in https://github.com/blue-marble/gridpath/pull/1153
* **Maintenance**: Improvements to hydro inputs handling by anamileva in https://github.com/blue-marble/gridpath/pull/1156
* **Bugfix**: Fix duplicate timepoint inputs with spinup/lookahead by anamileva in https://github.com/blue-marble/gridpath/pull/1157
* **Feature**: Created instantaneous penetration optional feature by alexrob18 in https://github.com/blue-marble/gridpath/pull/1148
* **Bugfix**: Fix availability derate bug with iterations by anamileva in https://github.com/blue-marble/gridpath/pull/1158
* **Docs**: Update RA Toolkit README by anamileva in https://github.com/blue-marble/gridpath/pull/1160

New Contributors
* alexrob18 made their first contribution in https://github.com/blue-marble/gridpath/pull/1148

Deprecation Notice
The UI will be deprecated in 2025 in favor of an easier-to-maintain and more flexible approach.

**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v2024.1.0...v2024.2.0

What's Changed
* **Enhancement**: Don't index horizons by subproblems by anamileva in https://github.com/blue-marble/gridpath/pull/1090
* **Feature**: Hydro energy budgets by stage by anamileva in https://github.com/blue-marble/gridpath/pull/1091
* added original RA Toolkit pre- and post-processing code by elainekhart in https://github.com/blue-marble/gridpath/pull/1093
* **Enhancement**: Reimplement Tx targets to be indexed by horizon by anamileva in https://github.com/blue-marble/gridpath/pull/1067
* **Feature**: Max transmission targets by anamileva in https://github.com/blue-marble/gridpath/pull/1069
* **Feature**: Project-level carbon credit purchases by anamileva in https://github.com/blue-marble/gridpath/pull/1075
* **Bugfix**: Fix issues when updating existing subscenario data in the database by sriharid in https://github.com/blue-marble/gridpath/pull/1085
* **Feature**: Carbon credits exogenous demand and supply by Janie115 in https://github.com/blue-marble/gridpath/pull/1081
* **Major Feature**: RA Toolkit Integration by anamileva in https://github.com/blue-marble/gridpath/pull/1094
* **Bugfix**: Fix the validation of heat rates by Janie115 in https://github.com/blue-marble/gridpath/pull/1096
* **Enhancement**: Run individual RA Toolkit steps from main script by anamileva in https://github.com/blue-marble/gridpath/pull/1100
* **Enhancement**: OS-dependent test example objective functions by anamileva in https://github.com/blue-marble/gridpath/pull/1103

New Contributors
* elainekhart made their first contribution in https://github.com/blue-marble/gridpath/pull/1093

**Full Changelog**: https://github.com/blue-marble/gridpath/compare/v0.16.1...v2024.1.0