Update methanol steam reforming investment costs

[AlexanderMeisinger]

Closes # (if applicable).

Changes proposed in this Pull Request

The investment cost currently assumed for methanol steam reforming appears unrealistically low at 18016 EUR/MW H2. Carels et al. (2025, https://doi.org/10.1016/j.ijhydene.2025.06.128) report investment costs of 4000 €2024/(kg H2/h) for methanol steam reforming in the supplementary material, Table 7, based on several literature sources. Using the hydrogen LHV of 33.33 kWh/kg, this corresponds to approximately 120012 €2024/MW H2. Although this value refers to 2035, it appears considerably more realistic than the current assumption.

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• Data source for new technologies is clearly stated.
• Newly introduced dependencies are added to environment.yaml (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• I consent to the release of this PR's code under the GPLv3 license.

[AlexanderMeisinger]

This will solve issue #271.

[euronion]

Thanks for the sugestion.

The current base value is actually higher (5 000 EUR/kg H2 /h) than your suggested value (4 000 EUR/kg H2h), with the difference being the facility capacity.
The current value is calculated for a large facility (200 MW) with a scaling factor of 0.6, whilst you do not scale your value.

I would say these are different legitimate cases and could warrant separate entries, e.g.:

• Methanol steam reforming 200 MW : Renaming of the existing entry
• Methanol steam reforming 1 MW: Either your entry or based on the current entry without the scaling applied, i.e. 5 kEUR/kg H2/h2

What do you think about this approach?

In addition, if we adopt the source that you suggest, could you make sure to adjust the other techno-economic assumptions to be in line with the new source as well?