Issues

• spec: check pypsa.yaml builds against mathspec's PyPSA reference objectives

  PyPSA/linopy#1075 · Filter by author FabianHofmann opened on Oct 27, 2026

• spec: sparse parameter data is densified at build and in model.parameters

  enhancementmath-specperformancesparse
  PyPSA/linopy#1072 · Filter by author FabianHofmann opened on Oct 27, 2026

• spec: bare relations, relations from two-column DataFrames, and sets derived from data

  enhancementmath-spec
  PyPSA/linopy#1071 · Filter by author FabianHofmann opened on Oct 27, 2026

• doc/contributing.rst: benchmark commands are stale (--quick, test_build.py, memory.py)

  documentation
  PyPSA/linopy#1065 · Filter by author FabianHofmann opened on Oct 26, 2026

• QuadraticExpression.groupby(...).sum() returns a LinearExpression

  bug
  PyPSA/linopy#1064 · Filter by author FabianHofmann opened on Oct 26, 2026

• spec: full mathspec relation joins and quadratic constraints (follow-up to #958)

  enhancementmath-spec
  PyPSA/linopy#1063 · Filter by author FabianHofmann opened on Oct 26, 2026

• Sparse quadratic expression groupby(pd.Series).sum() raises in CSRStore._from_scatter

  bug
  PyPSA/linopy#1060 · Filter by author FabianHofmann opened on Oct 26, 2026

• Drop the per-nonzero cell array from Store.terms() to cut transient memory in the dense LP export

  performancerefactorv1
  PyPSA/linopy#1058 · Filter by author FabianHofmann opened on Oct 24, 2026

• Constant LinearExpression * multi-term LinearExpression raises TypeError (mirrored product works)

  bug
  PyPSA/linopy#1055 · Filter by author FabianHofmann opened on Oct 23, 2026
  2

• Dense LinearExpression.to_constraint('==') keeps sign '==': repr raises KeyError, differs from sparse '='

  bug
  PyPSA/linopy#1054 · Filter by author FabianHofmann opened on Oct 23, 2026

• spec: rows emptied by absence are dropped silently; revisit strict refusal

  discussionmath-spec
  PyPSA/linopy#993 · Filter by author FabianHofmann opened on Sep 28, 2026
  2

• add_piecewise_formulation use case: snapshot-dimensioned breakpoints (PyPSA/PyPSA#1914)

  enhancementmodel formulation
  PyPSA/linopy#953 · Filter by author MaykThewessen opened on Sep 10, 2026

• Mosek output not shown in console when log_fn is set

  bugsolver interface
  PyPSA/linopy#948 · Filter by author mgrabovsky opened on Sep 8, 2026

• Zero culling forces model rebuilding

  bugdata-modelperformance
  PyPSA/linopy#925 · Filter by author olivier-lacroix opened on Sep 4, 2026
  1

• Math-spec integration

  enhancementmath-spec
  PyPSA/linopy#919 · Filter by author FabianHofmann opened on Sep 3, 2026
  2

• Add LazyExpresssions

  data-modelenhancementmath-spec
  PyPSA/linopy#888 · Filter by author brynpickering opened on Aug 12, 2026

• Move to mkdocs (or equivalent) for docs

  documentation
  PyPSA/linopy#873 · Filter by author brynpickering opened on Jul 27, 2026 · Post v1
  3

• Plan: v1 semantics community discussion (open after #717 merges)

  discussionmodel formulationv1
  PyPSA/linopy#857 · Filter by author FBumann opened on Jul 20, 2026

• Add a mask parameter to add_piecewise_formulation

  enhancementmodel formulation
  Feature

  PyPSA/linopy#799 · Filter by author FBumann opened on Jun 29, 2026

• Design: Model.restrict / advance — slice a model along a coordinate and condition on boundary values (rolling horizon)

  data-modeldiscussionenhancementperformance
  PyPSA/linopy#768 · Filter by author FabianHofmann opened on Jun 7, 2026
  11

• Split dev-facing extras into PEP 735 dependency groups (and the pip ≥ 25.1 implication)

  dependenciesrefactor
  PyPSA/linopy#763 · Filter by author FBumann opened on Jun 5, 2026

• groupby-sum pads every group to the largest group size

  data-modelenhancementperformance
  PyPSA/linopy#745 · Filter by author FBumann opened on Jun 3, 2026 · Resolve Memory issues in sparse models
  1

• Tighten type hints on add_variables / add_constraints / add_objective

  data-modelrefactor
  PyPSA/linopy#734 · Filter by author FBumann opened on May 27, 2026
  1

• Variable.update() / Constraint.update() should validate inputs the same way add_variables() / add_constraints() do

  data-modelenhancement
  PyPSA/linopy#731 · Filter by author FBumann opened on May 27, 2026

• Opt-in allocator arena release after Model.solve() to bound RSS across sequential solves

  enhancementperformance
  PyPSA/linopy#720 · Filter by author MaykThewessen opened on May 21, 2026
  3