iiasa/message_ix

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The integrated assessment and energy systems model MESSAGEix

Stars: 150
Forks: 178
Open beginner issues: 0
Indexed issues: 111
Avg merge: 17h 32m
Merged PRs (30d): 2

Dominant language: Jupyter Notebook
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Open All

111 open issues indexed

More intuitive treatment of `type_*` and `cat_*` mappings Open

enh

iiasa/message_ix#21 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Remove solver options from default installation Open

enh

iiasa/message_ix#40 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
better description of GAMS execution/license errors & debugging Open

iiasa/message_ix#43 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
fixed_new_capacity sets CAP_NEW but not CAP Open

enh

iiasa/message_ix#86 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Develop an explicit section of "drivers" Open

enh

iiasa/message_ix#115 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Technology mapping sets remain unchanged after modifying the respective parameters Open

iiasa/message_ix#120 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Implement diffusion constraints by technology groups and across regions Open

enh

iiasa/message_ix#121 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Sanity check for `technical_lifetime` correct? Open

bug good first issue

iiasa/message_ix#137 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add optional relaxation ("slack" variables) for new features Open

enh

iiasa/message_ix#160 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Reading data of a subset of parameters through 'read_excel' function Open

enh

iiasa/message_ix#163 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Numerical properties of the LP optimization problem generated from message_ix Open

iiasa/message_ix#179 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Sub-annual time step compatibility Open

enh timeslice

iiasa/message_ix#191 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
inv_tec definition - does not allow adding inv_cost to technologies in cloned modell Open

iiasa/message_ix#219 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
‘year’ set on scenario != ‘year’ set in GAMS Open

iiasa/message_ix#227 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add-on parameter documentation is incomplete Open

docs

iiasa/message_ix#241 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Disentangle message_ix and ixmp_source Open

discuss

iiasa/message_ix#254 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Scenario.solve(...) works in Python but GAMS errors in R Open

bug R

iiasa/message_ix#257 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add .model_years property to message_ix.Scenario Open

enh help wanted

iiasa/message_ix#270 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Update Units for better transparency Open

discuss

iiasa/message_ix#277 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Definition of set map_tec_mode Open

iiasa/message_ix#280 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
bound_emission values equal to 0 disappear in output GDX Open

awaiting info

iiasa/message_ix#306 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Document dimensions of historical_emission vs. EMISS Open

docs question

iiasa/message_ix#314 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 17, 2026
Add a tutorial demonstrating the use of Scenario.add_macro Open

docs enh macro

iiasa/message_ix#316 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Address hardcoded units MACRO calibration and M-M linkage Open

macro

iiasa/message_ix#317 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add nightly test of MESSAGE-MACRO calibration & run Open

ci macro

iiasa/message_ix#318 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Update handling of discount/interest rates in M-M link Open

enh macro

iiasa/message_ix#319 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Clarify add_macro() behaviour on a non-'clean' Scenario Open

macro

iiasa/message_ix#320 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
MACRO runs after MESSAGE scenario solves "optimal with unscaled inf." Open

macro

iiasa/message_ix#337 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
MESSAGE-MACRO fails to converge with small oscillations Open

macro

iiasa/message_ix#339 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Automatics parameters such map_tec_time presenting weird behaviour Open

timeslice

iiasa/message_ix#348 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Problems to represent an existing technology Open

iiasa/message_ix#376 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Use consistent code style in R-tutorial notebooks Open

docs good first issue help wanted

iiasa/message_ix#378 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add details on MACRO calibration from v2017 annex of MESSAGE-GLOBIOM documentation Open

docs macro

iiasa/message_ix#399 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
GAMS infeasibilities with limited foresight/rolling horizon setting Open

awaiting info

iiasa/message_ix#418 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Use scipy.interpolate in message_ix.tools.add_year Open

enh help wanted

iiasa/message_ix#433 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Report quantities for n=‘World’ in one of 2+ ways Open

reporting

iiasa/message_ix#443 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Accelerate Scenario.par_list(…, indexed_by=…) using MESSAGE_ITEMS Open

enh

iiasa/message_ix#444 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Java heap space issues Open

iiasa/message_ix#455 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Extend documentation to include info on (national) modeling Open

docs

iiasa/message_ix#464 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 17, 2026
Extend documentation on debugging Open

docs

iiasa/message_ix#465 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 17, 2026
Extend documentation to include recent FAQs Open

docs

iiasa/message_ix#466 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 17, 2026
Limit read_excel() to existing elements for set 'year' etc. Open

discuss enh

iiasa/message_ix#486 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Unit incompatibility error when reporting some scenarios Open

reporting

iiasa/message_ix#489 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Improve docker container generation/enable binder Open

discuss enh

iiasa/message_ix#490 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Non-integer `technical_lifetime` → error in scaling_investment_costs.gms Open

bug

iiasa/message_ix#503 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Zero values in GDX Open

iiasa/message_ix#516 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
COST_NODAL calculation error Open

iiasa/message_ix#517 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Handling of GAMS default configuration: e.g. solprint Open

docs enh

iiasa/message_ix#536 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Problems regarding input and output efficiencies Open

iiasa/message_ix#537 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add parameter `historical_total_capacity` Open

enh gams

iiasa/message_ix#542 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026

iiasa/message_ix

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