Rate a component by the capacity an operations model may dispatch - #17
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PyPSA ignores the `p_nom` of an extendable component, so `p_nom` alone cannot say what an operations model may dispatch. The `pypsa-to-sienna` leg read it anyway, so a component the plan had not decided reached Sienna rated at a capacity nobody had built. `capacity_choice` states the rule once: a component is rated from `p_nom_opt` where a solve wrote one, from the lower of `p_nom_min` and `p_nom` where it states a floor a build cannot take away, and from `p_nom` otherwise. One chain gives both the capacity and the column `decisions.md` names it from, so the two cannot disagree. Capping `p_nom_min` by `p_nom` is what separates a plant that already runs from a minimum build the model forces on a candidate nobody has built. A component with none of the three is a build rather than a plant, and the generator, renewable, hydro, storage and link mappings leave it out and record it as skipped. The `sienna-to-pypsa` leg writes the same floor back, so a round trip keeps a component it restored as extendable. Without it PyPSA ignored the `p_nom` that came back and a solve could delete the plant. Two faults this found on the way, both where a zero is now an ordinary value: `_map_generators` divided by a zero `base_power` and stopped the whole translation, and a hydro unit with no capacity to convert its inflow with gave the h5 sink a zero divisor, which wrote an infinite energy budget. Signed-off-by: Thomas C. King <thomas.k@transitionzero.org>
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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: Organization UI Review profile: ASSERTIVE Plan: Advanced Run ID: 📝 SummarySummary by CodeRabbit
WalkthroughThe PR standardizes effective capacity selection, filters unbuilt candidates, preserves minimum capacities during Sienna-to-PyPSA translation, centralizes extension consumption reporting, and updates mapping documentation and BDD scenarios. ChangesCapacity interoperability and pipeline reporting
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant PyPSA
participant CapacityMapping
participant Sienna
participant Reporter
participant PyPSASink
PyPSA->>CapacityMapping: provide capacity columns
CapacityMapping->>Sienna: map effective capacity
Sienna->>Reporter: record extendable capacity floor
Reporter->>PyPSASink: provide p_nom_min or s_nom_min
PyPSASink->>PyPSA: write minimum capacity
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Some skipped or unread translation data is not fully represented in audit output, making translation decisions incomplete or ambiguous. These reporting defects should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 38.95% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 95 functions across 24 files. (11 skipped: 11 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Gate: ✅ PASS All files grade A. Full report
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Mutation testing reportScore: 79.2% (290 killed / 366 tested)
Timeout-prone functionsEach timeout burns its whole budget (
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This was referenced Sep 11, 2026
thomaschristopherking
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September 11, 2026 09:56
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In `@interop/core/pipeline.py`:
- Around line 107-108: Update State.report_unread_extensions() so it initializes
ExtensionConsumption when consumed_extensions is None, then always invokes
report_unconsumed(). Preserve reporting of NOT_MAPPED events for
source_extensions records even when no pipeline step calls
State.extension_reader().
In `@interop/plugins/shared/pypsa_sienna_translations/_component_mapping.py`:
- Line 70: Update _prepare_source to evaluate every applicable SkipRule against
the same carrier-filtered table rather than passing each filter_component result
into the next rule. Preserve each failed rule’s SkipReport per source row,
combine the rules’ keep conditions, and apply that combined condition once.
In `@interop/plugins/shared/pypsa_sienna_translations/_storage.py`:
- Line 321: Update the STORAGE_BASE_POWER definition to pass unit=UNIT_MW to
_rated, matching the analogous hydro translation and preserving the MW unit in
both source capacity and Sienna base-power decision reports.
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📒 Files selected for processing (36)
docs/translation_mappings/translation-from-pypsa-to-sienna.mddocs/translation_mappings/translation-from-sienna-to-pypsa.mdinterop/core/extensions.pyinterop/core/pipeline.pyinterop/core/runner.pyinterop/core/use_cases/translate.pyinterop/plugins/shared/pypsa_constants.pyinterop/plugins/shared/pypsa_sienna_translations/__init__.pyinterop/plugins/shared/pypsa_sienna_translations/_component_mapping.pyinterop/plugins/shared/pypsa_sienna_translations/_generators.pyinterop/plugins/shared/pypsa_sienna_translations/_hydro.pyinterop/plugins/shared/pypsa_sienna_translations/_links.pyinterop/plugins/shared/pypsa_sienna_translations/_renewables.pyinterop/plugins/shared/pypsa_sienna_translations/_shared.pyinterop/plugins/shared/pypsa_sienna_translations/_storage.pyinterop/plugins/shared/sienna_pypsa_translations/mapping.pyinterop/plugins/shared/sienna_pypsa_translations/reporters.pyinterop/plugins/shared/translation_runner.pyinterop/plugins/sinks/emit_pypsa_network.pyinterop/plugins/steps/pypsa_to_sienna_map_components.pyinterop/plugins/steps/sienna_to_pypsa/map_components.pyinterop/plugins/steps/sienna_to_pypsa/map_generators.pyinterop/plugins/steps/sienna_to_pypsa/map_storage_units.pyinterop/plugins/steps/sienna_to_pypsa/map_transmission.pytests/features/pypsa_to_sienna/hydro.featuretests/features/pypsa_to_sienna/links.featuretests/features/pypsa_to_sienna/renewables.featuretests/features/pypsa_to_sienna/storage.featuretests/features/pypsa_to_sienna/thermal_generators.featuretests/features/pypsa_to_sienna_to_pypsa.featuretests/features/sienna_to_pypsa/generators.featuretests/features/sienna_to_pypsa/lines.featuretests/features/sienna_to_pypsa/links.featuretests/step_defs/conftest.pytests/step_defs/pypsa_to_sienna/conftest.pytests/step_defs/test_pypsa_to_sienna_to_pypsa.py
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- tests/step_defs/test_pypsa_to_sienna_to_pypsa.py
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STORAGE_BASE_POWER was the only _rated translation that did not pass a unit, so decisions.md showed the source capacity and the Sienna base_power without MW. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Thomas C. King <thomas.k@transitionzero.org>
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TL;DR
PyPSA ignores the
p_nomof an extendable component, sop_nomalone cannot say what anoperations model may dispatch. The
pypsa-to-siennaleg read it anyway, so a component theplan had not decided reached Sienna rated at a capacity nobody had built.
capacity_choicenow states the rule once, and a component that holds no decided capacity is left out and
recorded as skipped.
First of six for transition-zero/tz-infra-interop#116.
The later parts read a PLEXOS expansion plan, carry its years and constraints, and write a
Sienna investments portfolio. Nothing here depends on those, so this can merge on its own.
Files to review (36, +681 / -307):
interop/plugins/shared/pypsa_sienna_translations/_shared.py(start here)capacity_choice, and the drop for a component that holds no decided capacity.interop/plugins/steps/sienna_to_pypsa/map_generators.pyinterop/plugins/steps/sienna_to_pypsa/map_transmission.pyinterop/plugins/shared/pypsa_sienna_translations/_hydro.pyinterop/plugins/shared/translation_runner.pyrow_source_translation, so an event names the column each row was read from.tests/features/pypsa_to_sienna/thermal_generators.featureWhy
A capacity an optimisation has not decided is not capacity a dispatch model may run. Three
cases were wrong before this:
p_nom_extendable, nop_nom_opt, no floorp_nomp_nom0,p_nom_min500, nop_nom_optp_nom_min, so a solve could delete itHow
One expression decides both the capacity and the column it came from.
capacity_choicereturns a struct of the two, and
with_effective_p_nomreads the value into_effective_p_nomand the column name into_capacity_attribute. Two separate expressionscould disagree, and
decisions.mdcarries that column name against every generator, storageunit, renewable and link, so a disagreement would write the wrong source attribute into the
audit trail.
Capping
p_nom_minbyp_nomis the one non-obvious choice. PyPSA documentsp_nom_minasthe lower bound of the build, which a user also sets to force a minimum build on a greenfield
candidate. Only the part of that bound the network also states as
p_nomis capacity thatalready exists.
Reviewer notes
_map_generatorsdivided bya zero
base_powerand stopped the whole translation; a hydro unit with no capacity gavethe h5 sink a zero divisor, which wrote
infinto the time-series file with only a numpywarning. A model's data never stops a translation and never writes a number nobody meant,
so the first is guarded and the second leaves the unit out and says so.
ComponentMapping.skipsholds a sequence now. One source table states two drop rules,and each rule needs its own report so a row never carries the wrong reason.
p_nom_mincap. A brownfield plant that may also shrink (p_nom500,p_nom_min200) is rated at 200, which is the floor a build cannot take away. I would likea second opinion on whether that is the reading you want.
Tests
590 scenarios pass, and all 17 pre-commit hooks.
Open workspace in Conductor