Fix bug of no gas infrastructure when no CCGT: gas implemented. (#1993)

* Fix bug of no gas infrastructure when no CCGT: gas implemented.

* Add release notes.

Author: jonathan-peel

doc/release_notes.rst

@@ -9,7 +9,10 @@ Release Notes
 Upcoming Release
 ================
 
+* Fix ConsistencyError for Links without buses when `gas_network: true`, but no `conventional_generation` (https://github.com/PyPSA/pypsa-eur/pull/1971)
+
 * Fix ConsistencyError for Links without buses when `industry: true`, but no `conventional_generation` or `biomass` (https://github.com/PyPSA/pypsa-eur/pull/1971)
+
 * Fix `mock_snakemake` due to breaking `snakemake` upstream API changes, i.e., requiring passing a `LoggerManager` instance (https://github.com/PyPSA/pypsa-eur/pull/1984).
 
 * Added technology-data v0.13.4 (https://github.com/PyPSA/technology-data/releases/tag/v0.13.4) to data versions (https://github.com/PyPSA/pypsa-eur/pull/1985).

scripts/prepare_sector_network.py

@@ -1919,6 +1919,16 @@ def add_storage_and_grids(
         logger.info(
             "Add natural gas infrastructure, incl. LNG terminals, production, storage and entry-points."
         )
+
+        add_carrier_buses(
+            n=n,
+            carrier="gas",
+            costs=costs,
+            spatial=spatial,
+            options=options,
+            cf_industry=None,
+        )
+
         gas_pipes = pd.read_csv(clustered_gas_network_file, index_col=0)
 
         if options["H2_retrofit"]: