[BUG] Unexpected behaviour in multi-region models

[tsmbland]

Describe the bug

I haven't done much work with multi-region models, but the example I've been working with (tutorial 3) doesn't look like I would expect.

Specifically, this model has two regions with gas, power and residential sectors. We're putting a strict upper limit on the capacity of heatpumps in region 2, and as a result, the residential sectors in the two regions look very different. I would therefore expect that, since the demand for gas and electricity will be different in the two regions, the gas and power sectors should have different capacities in the two regions to reflect this (I haven't added any commodity trade between regions). However, this isn't the case, and the gas and power sectors look identical in the two regions (at least according to the data in the output files).

To Reproduce

Run the model for tutorial 3 (found in docs/tutorial-code/3-add-region)

I don't know whether the problem is specific to this model or all multi-region models. If the latter, I'm surprised nothing has been flagged before.

Expected behavior

I would expect the gas and power sectors in the two regions to have different capacities, reflecting the different demand for gas and electricity in the residential sector. Unless I'm completely misunderstanding something here...

Screenshots

Follow the link above for tutorial 3 to see figures

Context

Please, complete the following to better understand the system you are using to run MUSE.

• Operating system (eg. Windows 10):
• MUSE version (eg. 1.0.1): dev
• Installation method (eg. pipx, pip, development mode): dev
• Python version (you can get this running python --version):

[tsmbland]

See #556 (comment)