Align battery cost with PyPSA modelling

[danielelerede-oet]

Changes proposed in this Pull Request

Hi @euronion , with @yerbol-akhmetov we noticed a mismatch in the units of battery storage costs fetched from NREL ATB.

This PR removes automatic fetching of battery storage costs from the NREL ATB dataset due to mismatch wrt modelling in PyPSA. Indeed, the USD/kW cost in NREL ATB is representative of BESS accounting for all major components, including the LIB pack, the inverter, and the balance of system (BOS) needed for the installation. In PyPSA (with particular reference to PyPSA-Earth), instead,battery storage and battery inverter are modelled separately and costs are expressed in different units, USD/kWh and USD/kW, respectively.

Checklist

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

[yerbol-akhmetov]

Hi, @danielelerede-oet. Thanks for the PR. I have a question about adding grid connection costs and other financial costs. Does other technologies include those? If not, will it be fair to include it only for batteries. Definitely, such data brings the modelling closer to real word.

[danielelerede-oet]

Hi, @danielelerede-oet. Thanks for the PR. I have a question about adding grid connection costs and other financial costs. Does other technologies include those? If not, will it be fair to include it only for batteries. Definitely, such data brings the modelling closer to real word.

Yes @yerbol-akhmetov , all the other power sector technologies from NREL ATB include grid connection and project financing costs. This was true also for the "old" battery costs that were directly fetched from the NREL .parquet file.