Excluding Emissions from Sector Ratios Development

[toniseibold]

Closes (PyPSA/pypsa-ariadne#124)

Changes proposed in this Pull Request

Currently a linear interpolation between current sector ratios and future sector ratios is assumed. However, in the current sector ratios, process emission and process emission from feedstock do not exist. Together with the config sector_ratios_fraction_future, this leads to 0 emissions in the industry sector in 2020 and a linear growth until 2045.

I assumed that the emissions in the industry currently are not going to magically disappear in 2020 and increase until 2045 so I set it to be constant.

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in all of config.default.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv.
• A release note doc/release_notes.rst is added.

[lindnemi]

Could you paste Emissions|CO2|Industrial Processes?

Before this PR it looked like this:

I also wonder why process emissions is missing in today_ratios?

[toniseibold]

Emissions|CO2|Industrial Processes|Mt CO2/yr| 34.5449093478852 | 31.7975013193079 | 3.7944849581216 | 3.96369796528107 | 4.17226169369013 | 4.4065174844019

[lindnemi]

Looks good to me. @fneum should we use this PR or (partly) revert the offending fillna?

Just a note: The model seems to switch very quickly to process emissions CC in 2030. Maybe we should limit the PE CC build out speed

[fneum]

cherry-picked in master via 9b78319