diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7aabf0e6..c17c0425 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -31,7 +31,7 @@ jobs:
         os:
         - ubuntu-latest
         - macos-latest
-#        - windows-latest
+        - windows-latest
         inhouse:
         - stable
         - master
diff --git a/Snakefile b/Snakefile
index ba93a869..e6980708 100644
--- a/Snakefile
+++ b/Snakefile
@@ -8,7 +8,7 @@ from os.path import normpath, exists
 from shutil import copyfile, move, rmtree
 from snakemake.utils import min_version
 
-min_version("8.5")
+min_version("8.11")
 
 from scripts._helpers import path_provider, copy_default_files, get_scenarios, get_rdir
 
diff --git a/envs/environment.yaml b/envs/environment.yaml
index ee1d1605..0a378fdc 100644
--- a/envs/environment.yaml
+++ b/envs/environment.yaml
@@ -20,7 +20,7 @@ dependencies:
 - openpyxl!=3.1.1
 - pycountry
 - seaborn
-- snakemake-minimal>=8.5
+- snakemake-minimal>=8.11
 - memory_profiler
 - yaml
 - pytables
diff --git a/rules/build_electricity.smk b/rules/build_electricity.smk
index afe0db8e..72a7684a 100644
--- a/rules/build_electricity.smk
+++ b/rules/build_electricity.smk
@@ -433,7 +433,7 @@ rule add_electricity:
             else resources("networks/base.nc")
         ),
         tech_costs=lambda w: resources(
-            f"costs_{config_provider('costs', 'year')(w)}.csv"
+            f"costs_{config_provider('costs', 'year') (w)}.csv"
         ),
         regions=resources("regions_onshore.geojson"),
         powerplants=resources("powerplants.csv"),
@@ -478,7 +478,7 @@ rule simplify_network:
     input:
         network=resources("networks/elec.nc"),
         tech_costs=lambda w: resources(
-            f"costs_{config_provider('costs', 'year')(w)}.csv"
+            f"costs_{config_provider('costs', 'year') (w)}.csv"
         ),
         regions_onshore=resources("regions_onshore.geojson"),
         regions_offshore=resources("regions_offshore.geojson"),
@@ -526,7 +526,7 @@ rule cluster_network:
             else []
         ),
         tech_costs=lambda w: resources(
-            f"costs_{config_provider('costs', 'year')(w)}.csv"
+            f"costs_{config_provider('costs', 'year') (w)}.csv"
         ),
     output:
         network=resources("networks/elec_s{simpl}_{clusters}.nc"),
@@ -555,7 +555,7 @@ rule add_extra_components:
     input:
         network=resources("networks/elec_s{simpl}_{clusters}.nc"),
         tech_costs=lambda w: resources(
-            f"costs_{config_provider('costs', 'year')(w)}.csv"
+            f"costs_{config_provider('costs', 'year') (w)}.csv"
         ),
     output:
         resources("networks/elec_s{simpl}_{clusters}_ec.nc"),
@@ -590,7 +590,7 @@ rule prepare_network:
     input:
         resources("networks/elec_s{simpl}_{clusters}_ec.nc"),
         tech_costs=lambda w: resources(
-            f"costs_{config_provider('costs', 'year')(w)}.csv"
+            f"costs_{config_provider('costs', 'year') (w)}.csv"
         ),
         co2_price=lambda w: resources("co2_price.csv") if "Ept" in w.opts else [],
     output:
diff --git a/scripts/add_existing_baseyear.py b/scripts/add_existing_baseyear.py
index e75fe5a2..0ae23125 100644
--- a/scripts/add_existing_baseyear.py
+++ b/scripts/add_existing_baseyear.py
@@ -310,7 +310,7 @@ def add_power_capacities_installed_before_baseyear(n, grouping_years, costs, bas
                     n.madd(
                         "Generator",
                         new_capacity.index,
-                        suffix=" " + name_suffix,
+                        suffix=name_suffix,
                         bus=new_capacity.index,
                         carrier=generator,
                         p_nom=new_capacity,