Issues

• Cost exchange between MESSAGE and MACRO iterations in MESSAGE-MACRO_run.gms

  iiasa/message_ix#1036 · Filter by author lukeggert opened on Sep 22, 2026
  

• Diagnose super-linear increase in model generation time at high node count

  iiasa/message_ix#1022 · Filter by author Wegatriespython opened on Jun 10, 2026

• Improve Recursive Dynamic Mode

  discussgams
  iiasa/message_ix#1016 · Filter by author Wegatriespython opened on May 27, 2026
  

• Address CI errors with R 4.6.0

  ciR
  iiasa/message_ix#1011 · Filter by author khaeru opened on Apr 27, 2026

• Bump docs requirements prior to 3.12 release

  docs
  Task

  iiasa/message_ix#1005 · Filter by author khaeru opened on Mar 27, 2026 · 3.12
  

• scenario.solve() error in 3.11.1 version

  awaiting info
  iiasa/message_ix#1000 · Filter by author cheolhung opened on Jan 27, 2026
  4

  

• Add convenience function for defining expected Regions and Units on ixmp4 Platforms

  enh
  iiasa/message_ix#994 · Filter by author glatterf42 opened on Dec 10, 2025

• Add Constant Elasticity Substitution to Bin translation layer

  enh
  Feature

  iiasa/message_ix#984 · Filter by author Wegatriespython opened on Oct 22, 2025
  2

  

• Collective Issue for Time-Slice Implementation

  timeslice
  iiasa/message_ix#979 · Filter by author Wegatriespython opened on Oct 8, 2025
  

• Investigate PRICE_COMMODITY spikes with non-uniform duration_period

  Bug

  iiasa/message_ix#973 · Filter by author Wegatriespython opened on Aug 21, 2025
  10

  

• levelized_cost parameter is empty

  iiasa/message_ix#971 · Filter by author Tyler-lc opened on Aug 18, 2025
  1

• Align with Dantzig's (1963) original transport problem

  discuss
  iiasa/message_ix#968 · Filter by author khaeru opened on Aug 12, 2025
  1

• lp_diag parsing error

  bug
  Bug

  iiasa/message_ix#945 · Filter by author Wegatriespython opened on May 30, 2025 · 3.12

• ValueError following Reporter.add_sankey() with 2+ regions

  bughelp wantedreporting
  iiasa/message_ix#942 · Filter by author khaeru opened on May 13, 2025

• Define and apply a GAMS code style

  discussenhgamshelp wanted
  iiasa/message_ix#934 · Filter by author khaeru opened on Apr 16, 2025
  2

• Simplify SHARE_CONSTRAINT_COMMODITY_{LO,UP}

  gamsgood first issuehelp wanted
  iiasa/message_ix#933 · Filter by author khaeru opened on Apr 15, 2025

• Improve/extend Scenario.vintage_and_active_years()

  bugenh
  iiasa/message_ix#917 · Filter by author khaeru opened on Feb 20, 2025

• Collective Issue for GAMS related issues

  gams
  iiasa/message_ix#907 · Filter by author OFR-IIASA opened on Jan 16, 2025
  1

• share_commodity_up set to 0 inactive

  buggams
  iiasa/message_ix#902 · Filter by author OFR-IIASA opened on Dec 20, 2024

• Distinguish (ACT + historical_activity) × output from out in reporting

  reporting
  iiasa/message_ix#901 · Filter by author khaeru opened on Dec 12, 2024

• Migrating away from GAMS

  enhgams
  iiasa/message_ix#879 · Filter by author glatterf42 opened on Oct 3, 2024
  7

• Improve documentation of share constraints

  docs
  iiasa/message_ix#876 · Filter by author glatterf42 opened on Sep 11, 2024

• Additional dynamic and soft constraints for total_capacity

  enhgamshelp wanted
  iiasa/message_ix#869 · Filter by author OFR-IIASA opened on Jul 25, 2024

• Incomplete identification of "active" technologies.

  enhgamshelp wanted
  iiasa/message_ix#868 · Filter by author OFR-IIASA opened on Jul 25, 2024

• Extend historical parameters to track all VAR when shifting firstmodelyear

  enhgamshelp wanted
  iiasa/message_ix#867 · Filter by author OFR-IIASA opened on Jul 25, 2024
  1