LCOE output doesn't work [BUG]

[tsmbland]

Describe the bug

You get an error if you try to include the LCOE output:

ValueError: cannot insert hour, already exists

Raised by this line

To Reproduce

Include the following in the settings file for a model

[[outputs]]
quantity = "LCOE"
sink = "aggregate"
filename = "{cwd}/{default_output_dir}/MCA{Quantity}.csv"

and you will get the error above

Expected behavior

This should work without error, and create a file containing the LCOE metric for the simulation. This worked when I tried it a few weeks ago investigating #316, so whatever the problem it's relatively new. I think it was very likely introduced by #289

Screenshots

If applicable, add screenshots to help explain your problem.

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): 3.12

[tsmbland]

And it seems LCOE beats supply by being calculated in three different places!