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Changelog

All notable changes to MacroEnergy.jl will be documented in this file.

The format is based on Keep a Changelog, and this project follows Julia package versioning through Project.toml releases.

[Unreleased]

[0.2.2] - 2026-08-05

Fixed

  • Duplicate asset IDs within a system are now rejected during system generation, preventing ambiguous myopic capacity carry-over and late wide-output failures.

[0.2.1] - 2026-07-15

Changed

  • Updated MacroEnergySolvers.jl version to 0.2.2

Fixed

  • Fix wacc default preventing fallback to DiscountRate. Omitted wacc was silently treated as 0.0 instead of falling back to the case-level DiscountRate.

Migration guide

  • Results change: no public API changed, but any case that omits an asset's wacc will now produce different results. Previously the missing wacc defaulted to 0.0; it now falls back to the case's DiscountRate. Cases relying on the old default will see different annualized investment costs after upgrading. To keep the old behavior, set wacc explicitly to 0.0 for the affected asset(s).

[0.2.0] - 2026-05-22

Added

  • Outputs can now be written to a JSON file using the write_to_json method. This method writes to a compressed .json.gz but also supports regular .json outputs. It is not currently built into any of the run tools.
  • Improved JSON serialization coverage of commodities, storage, constraints, dual values, time data, solution algorithms, named tuples, JuMP containers, and special numeric values like Inf, -Inf, and NaN

Changed

  • CSV asset input files can now have their Type and Id columns in any position in the file, instead of needing to be in the first two columns. The Type and Id columns are still required.
  • run_case now returns (case, solution) as opposed to (systems, solution). The case object contains the systems as well as case-level settings.

Migration guide

  • If you are using the run_case function, update your code to handle the new return signature of (case, solution) instead of (systems, solution).

For example, if you previously had:

(system, solution) = run_case(@__DIR__; 
    optimizer=HiGHS.Optimizer,
    optimizer_attributes=("solver" => "ipm", "run_crossover" => "off", "ipm_optimality_tolerance" => 1e-3)
);

You should now use:

(case, solution) = run_case(@__DIR__;
    optimizer=HiGHS.Optimizer,
    optimizer_attributes=("solver" => "ipm", "run_crossover" => "off", "ipm_optimality_tolerance" => 1e-3)
);

If you need to access the systems, you can retrieve them from the case object.

systems = case.systems

[0.1.0] - 2026-04-14

Added

  • Expanded result writing and postprocessing for non-served demand, storage level, curtailment, time weights, discounted and undiscounted cost outputs, and detailed cost breakdowns.
  • Added full time-series reconstruction across Monolithic, Myopic, and Benders workflows through WriteFullTimeseries.
  • Added SyntheticAmmonia, SyntheticMethanol, ThermalAmmonia, ThermalAmmoniaCCS, ThermalMethanol, ThermalMethanolCCS, and OneWayTransmissionLink assets.
  • Added StorageChargeLimitConstraint, long-duration storage feasibility constraints for Benders, and additional storage safety checks.
  • Added Myopic restart support, StopAfterPeriod, optional JuMP direct-model generation, optional string names, updated default HiGHS settings, and economic utilities for present-value and cash-flow calculations.

Changed

  • Redesigned node supply inputs around named supply dictionaries with per-segment price, min, and max values.
  • Split edge types into explicit unidirectional and bidirectional forms.
  • Changed TransmissionLink to model bidirectional transfer; use OneWayTransmissionLink for one-way transfer.
  • Cleaned up user extension loading through the user_additions/ layout.
  • Renamed emissions-tracking assets to UpstreamEmissions and DownstreamEmissions, with compatibility aliases for older names.
  • Expanded documentation and tests for TimeData, timeseries outputs, retrofitting, run workflows, outputs, constraints, assets, transmission links, supply parsing, and user additions.

Removed

  • Removed legacy unified output code in favor of the expanded write_* output suite.

Fixed

  • Improved Benders output parity and cost handling by performing a final operational solve for the selected planning solution.
  • Fixed and improved transmission, storage, dual, cost, and documentation behavior across the release.

Migration guide

  • Update node supply inputs to the named supply dictionary format. Each supply segment should define price, min, and max values. Legacy price_supply and max_supply inputs are still handled, and update_node_supply_inputs(...) can help convert existing cases.
  • Review any cases using automatically generated supply segment names. Segment names now use segment1, segment2, and so on.
  • Review transmission assets. TransmissionLink is now bidirectional by default; use OneWayTransmissionLink when directionality matters.
  • Update any direct use of edge types to the explicit unidirectional and bidirectional edge forms.
  • Update output-processing scripts that relied on the legacy unified output code. Use the expanded write_* output functions instead.
  • Review models that assumed nodes did not include balance constraints by default. Nodes now have BalanceConstraint enabled by default.
  • Prefer the renamed emissions assets UpstreamEmissions and DownstreamEmissions. Compatibility aliases remain for older names, including FossilFuelsUpstream and FuelsEndUse.

[0.0.3] - 2025-11-21

Added

  • Added iron and steel sector assets and documentation.
  • Added heat and steam sector commodities, assets, examples, and documentation.
  • Added aluminum sector default real-world parameters.
  • Added output support for dual values from BalanceConstraint and CO2CapConstraint.
  • Added minimum retired capacity tracking and extended retrofit features to multi-stage models.
  • Added Windows coverage to CI.

Changed

  • Updated installation instructions, citation metadata, asset library docs, modeler debugging docs, and timeseries documentation.

Fixed

  • Fixed several Windows-related path and user-additions issues.
  • Fixed retrofit integer decisions, hydropower reservoir efficiency handling, documentation cross references, and Benders dual scaling behavior.

[0.0.2] - 2025-09-25

Added

  • Added logging options.
  • Added settings output in results.
  • Added automatic Mermaid diagrams for assets.
  • Added asset retrofits for single-stage cases.
  • Added options to free model memory and write myopic outputs during iterations.

Changed

  • Refactored output-writing utilities.

Fixed

  • Fixed subcommodity loading.

[0.0.1] - 2025-08-20

Added

  • Initial registered release of MacroEnergy.jl.

[Unreleased]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.2.1...HEAD [0.2.1]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.2.0...v0.2.1 [0.2.0]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.1.0...v0.2.0 [0.1.0]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.0.3...v0.1.0 [0.0.3]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.0.2...v0.0.3 [0.0.2]: https://github.com/macroenergy/MacroEnergy.jl/compare/v0.0.1...v0.0.2 [0.0.1]: https://github.com/macroenergy/MacroEnergy.jl/releases/tag/v0.0.1