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Add Nordic region emission factors and update emissions logic #1039

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@Hinetziedacted Hinetziedacted commented Jan 24, 2026

  • Created nordic_emissions.json with static emission factors (gCO2eq/kWh) for Nordic regions: SE1-4, NO1-5, FI
  • Updated emissions.py to check for Nordic regions and load static factors from the new JSON file
  • Sweden/Norway regions use 18 gCO2eq/kWh, Finland uses 72 gCO2eq/kWh based on ENTSO-E data

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@Hinetziedacted
Add Nordic region emission factors and update emissions logic
9defa40 
- Created nordic_emissions.json with static emission factors (gCO2eq/kWh) for Nordic regions: SE1-4, NO1-5, FI
- Updated emissions.py to check for Nordic regions and load static factors from the new JSON file
- Sweden/Norway regions use 18 gCO2eq/kWh, Finland uses 72 gCO2eq/kWh based on ENTSO-E data
@Hinetziedacted Hinetziedacted requested a review from a team as a code owner January 24, 2026 03:56
@benoit-cty
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benoit-cty commented Jan 26, 2026

Hello,
Thanks for the contribution.

Can you describe in the code how to proceed to update these values next year ? The best way is to provide a script. If it's too difficult, an URL to the data could be fine.

Also, can you fix the linting of the code ?
Look at how to use pre-commit in https://github.com/mlco2/codecarbon/blob/master/CONTRIBUTING.md

@Hinetziedacted
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Hinetziedacted commented Jan 26, 2026 •
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Thanks @benoit-cty!

For documentation - added detailed comments in the code with data sources. Values based on ENTSO-E:

Sweden/Norway (SE1-4, NO1-5): 18 gCO2eq/kWh - Nordic grid average sits around 60 gCO2eq/kWh, Sweden specifically ~19 gCO2/kWh from 2023

Finland: 72 gCO2eq/kWh - from Fingrid real-time estimates (63-73 range)

Links included:

For linting - pre-commit check needs approval first. Can run locally now if preferred?

@Hinetziedacted
Merge branch 'master' into add-nordic-emission-factors
8710c70
@Hinetziedacted
Add comprehensive documentation for Nordic emission factors
2ce226a 
- Added detailed comments explaining data sources (ENTSO-E, Fingrid)
- Included update procedure for annual maintenance
- Documented emission values: 18 gCO2eq/kWh (SE/NO), 72 gCO2eq/kWh (FI)
- Added direct links to data sources for future updates
@Hinetziedacted
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Hinetziedacted commented Jan 26, 2026 •
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Pushed documentation in commit 2ce226a.

Added in-code comments:

  • ENTSO-E and Fingrid data source links
  • Annual update instructions
  • Explanation of values

Running pre-commit locally and will push fixes.

@Hinetziedacted
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Hinetziedacted commented Jan 26, 2026

Just ran pre-commit locally - all checks passed! isort, black, flake8, and autoflake all came back clean. The code's good to go on the linting side.

@SaboniAmine
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SaboniAmine commented Jan 26, 2026

Hello, thanks for your contribution!
There is a weird indentation in the file, which seems to prevent it to run correctly, see screenshot:
image
Could you please :

  • Add a unit test
  • Use the caching mechanism to load data in cache, the same way US data is loaded in get_country_energy_mix_data ?
    This way, the json load won't be executed at each measurement

@Hinetziedacted
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Hinetziedacted commented Jan 27, 2026

Hey @SaboniAmine, thanks for catching that!

Just pushed a fix for the syntax error - it was a missing closing parenthesis on the logger.warning call (line 202). Should be good to run now.

For the unit test and caching - yeah totally makes sense. I'll work on those next:

  • Will add a test case for the Nordic region emissions calculation
  • Will refactor to use the caching mechanism like the US data does

Let me get those done and push them shortly!

@Hinetziedacted
Add caching for Nordic country energy mix data
9605e1e 
- Load and cache Nordic country energy mix data in _load_static_data()
- Add get_nordic_country_energy_mix_data() method to retrieve cached data
- This addresses the caching performance request in PR mlco2#1039
@Hinetziedacted
Refactor emissions.py to use cached Nordic energy mix data
358226b 
- Replace direct JSON file loading with cached data retrieval
- Use self._data_source.get_nordic_country_energy_mix_data() method
- Improves performance by eliminating repeated file I/O operations
- Part of implementation for PR mlco2#1039 reviewer feedback
@Hinetziedacted
Add unit tests for Nordic emissions functionality
c559002 
- Add test_get_emissions_PRIVATE_INFRA_NORDIC_REGION for Swedish region SE2
- Add test_get_emissions_PRIVATE_INFRA_NORDIC_FINLAND for Finland region FI
- Tests verify that Nordic regions use static emission factors correctly
- Tests check that emissions are positive and proportional to energy consumed
- Implements unit test requirement from PR mlco2#1039 reviewer feedback
@Hinetziedacted
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Hinetziedacted commented Jan 27, 2026 •
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Just pushed the changes.

Caching - moved json loading to input.py, loads once at startup. Added get_nordic_country_energy_mix_data() following the same pattern as US data

Tests - added test_get_emissions_PRIVATE_INFRA_NORDIC_REGION (SE2) and test_get_emissions_PRIVATE_INFRA_NORDIC_FINLAND (FI). Both verify emissions calc with static factors

Bug fixes - fixed syntax error (missing paren in logger.warning) and indentation

Commits: a5ff78f | 9605e1e | 358226b | c559002

Hinetziedacted and others added 4 commits January 27, 2026 23:26
@Hinetziedacted
Update path for Nordic emissions data file
0534362 
Fix filename mismatch: Changed from 'nordic_country_energy_mix.json' to 'nordic_emissions.json' to match the actual file that was created.
@Hinetziedacted
Remove leftover json.load code from line 187
da1510a
doc
1016d4a
lint
e1cb9a7
@benoit-cty
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benoit-cty commented Jan 30, 2026

You can run pre-commit locally with uv run pre-commit run --all-files.

I fixed some problems on your fork.

I understand that you code will only be used if the user want to use ElectricityMaps but the call fail. Is it what you wanted ?
And even then, I think the test in ["USA", "CAN"] will prevent it to be used.

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@Hinetziedacted @benoit-cty @SaboniAmine