diff --git a/Snakefile b/Snakefile
index a0709043..7678a401 100644
--- a/Snakefile
+++ b/Snakefile
@@ -160,7 +160,7 @@ if config['enable'].get('build_cutout', False):
 
 if config['enable'].get('retrieve_cutout', True):
     rule retrieve_cutout:
-        input: HTTP.remote("zenodo.org/record/4709858/files/{cutout}.nc", keep_local=True, static=True)
+        input: HTTP.remote("zenodo.org/record/6382570/files/{cutout}.nc", keep_local=True, static=True)
         output: "cutouts/{cutout}.nc"
         run: move(input[0], output[0])
 
diff --git a/config.tutorial.yaml b/config.tutorial.yaml
index ea624727..225d8f78 100755
--- a/config.tutorial.yaml
+++ b/config.tutorial.yaml
@@ -17,7 +17,7 @@ scenario:
   clusters: [5]
   opts: [Co2L-24H]
 
-countries: ['DE']
+countries: ['BE']
 
 clustering:
   simplify:
@@ -58,7 +58,7 @@ electricity:
 atlite:
   nprocesses: 4
   cutouts:
-    europe-2013-era5-tutorial:
+    be-03-2013-era5:
       module: era5
       x: [4., 15.]
       y: [46., 56.]
@@ -66,7 +66,7 @@ atlite:
 
 renewable:
   onwind:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: Vestas_V112_3MW
@@ -83,7 +83,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   offwind-ac:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: NREL_ReferenceTurbine_5MW_offshore
@@ -95,7 +95,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   offwind-dc:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: NREL_ReferenceTurbine_5MW_offshore
@@ -108,7 +108,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   solar:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: pv
       panel: CSi
diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index 7deee108..3f131dc0 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -64,6 +64,13 @@ Upcoming Release
 
 * The unused argument ``simple_hvdc_costs`` in :mod:`add_electricity` was removed.
 
+* Iterative solving with impedance updates is skipped if there are no expandable lines.
+
+* Switch from Germany to Belgium for continuous integration and tutorial to save resources.
+
+* Use updated SARAH-2 and ERA5 cutouts with slightly wider scope to east and additional variables.
+
+
 PyPSA-Eur 0.4.0 (22th September 2021)
 =====================================
 
@@ -105,7 +112,7 @@ PyPSA-Eur 0.4.0 (22th September 2021)
   [`#261 <https://github.com/PyPSA/pypsa-eur/pull/261>`_].
 
 * The tutorial cutout was renamed from ``cutouts/europe-2013-era5.nc`` to
-  ``cutouts/europe-2013-era5-tutorial.nc`` to accomodate tutorial and productive
+  ``cutouts/be-03-2013-era5.nc`` to accomodate tutorial and productive
   cutouts side-by-side.
 
 * The flag ``keep_all_available_areas`` in the configuration for renewable
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index b902f525..4704d179 100755
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -254,7 +254,12 @@ def solve_network(n, config, opts='', **kwargs):
     n.config = config
     n.opts = opts
 
-    if cf_solving.get('skip_iterations', False):
+    skip_iterations = cf_solving.get('skip_iterations', False)
+    if not n.lines.s_nom_extendable.any():
+        skip_iterations = True
+        logger.info("No expandable lines found. Skipping iterative solving.")
+
+    if skip_iterations:
         network_lopf(n, solver_name=solver_name, solver_options=solver_options,
                      extra_functionality=extra_functionality, **kwargs)
     else:
diff --git a/test/config.test1.yaml b/test/config.test1.yaml
index 2986037b..a9ce1e50 100755
--- a/test/config.test1.yaml
+++ b/test/config.test1.yaml
@@ -16,7 +16,7 @@ scenario:
   clusters: [5]
   opts: [Co2L-24H]
 
-countries: ['DE']
+countries: ['BE']
 
 clustering:
   simplify:
@@ -57,7 +57,7 @@ electricity:
 atlite:
   nprocesses: 4
   cutouts:
-    europe-2013-era5-tutorial:
+    be-03-2013-era5:
       module: era5
       x: [4., 15.]
       y: [46., 56.]
@@ -65,7 +65,7 @@ atlite:
 
 renewable:
   onwind:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: Vestas_V112_3MW
@@ -82,7 +82,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   offwind-ac:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: NREL_ReferenceTurbine_5MW_offshore
@@ -94,7 +94,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   offwind-dc:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: wind
       turbine: NREL_ReferenceTurbine_5MW_offshore
@@ -107,7 +107,7 @@ renewable:
     potential: simple # or conservative
     clip_p_max_pu: 1.e-2
   solar:
-    cutout: europe-2013-era5-tutorial
+    cutout: be-03-2013-era5
     resource:
       method: pv
       panel: CSi