Address pandas deprecation of date_parser for pandas.read_csv

doc/release_notes.rst

@@ -17,6 +17,8 @@ Upcoming Release
 
 * Renamed script file from PyPSA-EUR ``build_load_data`` to ``build_electricity_demand``.
 
+* Adressed deprecation warnings for ``pandas=2.0``. ``pandas=2.0`` is now minimum requirement.
+
 PyPSA-Eur 0.8.0 (18th March 2023)
 =================================
 

envs/environment.yaml

@@ -26,7 +26,7 @@ dependencies:
 - lxml
 - powerplantmatching>=0.5.5
 - numpy<1.24
-- pandas>=1.4
+- pandas>=2.0
 - geopandas>=0.11.0
 - xarray
 - rioxarray

scripts/build_electricity_demand.py

@@ -80,11 +80,8 @@ def load_timeseries(fn, years, countries, powerstatistics=True):
     def rename(s):
         return s[: -len(pattern)]
 
-    def date_parser(x):
-        return dateutil.parser.parse(x, ignoretz=True)
-
     return (
-        pd.read_csv(fn, index_col=0, parse_dates=[0], date_parser=date_parser)
+        pd.read_csv(fn, index_col=0, parse_dates=[0], date_format="%Y-%m-%dT%H:%M:%SZ")
         .filter(like=pattern)
         .rename(columns=rename)
         .dropna(how="all", axis=0)