diff --git a/Makefile b/Makefile
index 9d2f5fea5..d31e8655a 100755
--- a/Makefile
+++ b/Makefile
@@ -54,11 +54,11 @@ install-pinned-macos: _conda_check
 # Run default tests
 test:
 	set -e
-	snakemake solve_elec_networks --configfile config/test/config.electricity.yaml --rerun-triggers=mtime
-	snakemake --configfile config/test/config.overnight.yaml --rerun-triggers=mtime
-	snakemake --configfile config/test/config.myopic.yaml --rerun-triggers=mtime
-	snakemake make_summary_perfect --configfile config/test/config.perfect.yaml --rerun-triggers=mtime
-	snakemake --configfile config/test/config.scenarios.yaml --rerun-triggers=mtime -n
+	snakemake solve_elec_networks --configfile config/test/config.electricity.yaml
+	snakemake --configfile config/test/config.overnight.yaml
+	snakemake --configfile config/test/config.myopic.yaml
+	snakemake make_summary_perfect --configfile config/test/config.perfect.yaml
+	snakemake --configfile config/test/config.scenarios.yaml -n
 	echo "All tests completed successfully."
 
 unit-test:
@@ -66,11 +66,11 @@ unit-test:
 
 # Cleans all output files from tests
 clean-tests:
-	snakemake solve_elec_networks --configfile config/test/config.electricity.yaml --rerun-triggers=mtime --delete-all-output
-	snakemake --configfile config/test/config.overnight.yaml --rerun-triggers=mtime --delete-all-output
-	snakemake --configfile config/test/config.myopic.yaml --rerun-triggers=mtime --delete-all-output
-	snakemake make_summary_perfect --configfile config/test/config.perfect.yaml --rerun-triggers=mtime --delete-all-output
-	snakemake --configfile config/test/config.scenarios.yaml --rerun-triggers=mtime -n --delete-all-output
+	snakemake solve_elec_networks --configfile config/test/config.electricity.yaml --delete-all-output
+	snakemake --configfile config/test/config.overnight.yaml --delete-all-output
+	snakemake --configfile config/test/config.myopic.yaml --delete-all-output
+	snakemake make_summary_perfect --configfile config/test/config.perfect.yaml --delete-all-output
+	snakemake --configfile config/test/config.scenarios.yaml -n --delete-all-output
 
 # Removes all created files except for large cutout files (similar to fresh clone)
 reset:
diff --git a/config/config.default.yaml b/config/config.default.yaml
index 64197dbbe..150166679 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -1012,6 +1012,12 @@ solving:
     cbc-default: {} # Used in CI
     glpk-default: {} # Used in CI
 
+  check_objective:
+    enable: false
+    expected_value: None
+    atol: 1000
+    rtol: 0.001
+
   mem_mb: 30000 #memory in MB; 20 GB enough for 50+B+I+H2; 100 GB for 181+B+I+H2
   runtime: 6h #runtime in humanfriendly style https://humanfriendly.readthedocs.io/en/latest/
 
diff --git a/config/test/config.electricity.yaml b/config/test/config.electricity.yaml
index 147d735f3..4e05a3808 100644
--- a/config/test/config.electricity.yaml
+++ b/config/test/config.electricity.yaml
@@ -82,6 +82,9 @@ solving:
     name: highs
     options: highs-default
 
+  check_objective:
+    enable: true
+    expected_value: 39541845.44
 
 plotting:
   map:
diff --git a/config/test/config.overnight.yaml b/config/test/config.overnight.yaml
index e14ff86ba..b0a234cee 100644
--- a/config/test/config.overnight.yaml
+++ b/config/test/config.overnight.yaml
@@ -84,6 +84,10 @@ solving:
     options: highs-default
   mem: 4000
 
+  check_objective:
+    enable: true
+    expected_value: 7.1040937763e+08
+
 plotting:
   map:
     boundaries:
diff --git a/config/test/config.perfect.yaml b/config/test/config.perfect.yaml
index 742b30124..c8337c529 100644
--- a/config/test/config.perfect.yaml
+++ b/config/test/config.perfect.yaml
@@ -89,6 +89,10 @@ solving:
     options: highs-default
   mem: 4000
 
+  check_objective:
+    enable: true
+    expected_value: 14385130476
+
 plotting:
   map:
     boundaries:
diff --git a/matplotlibrc b/matplotlibrc
index bf667fb18..5db18d521 100644
--- a/matplotlibrc
+++ b/matplotlibrc
@@ -2,6 +2,5 @@
 #
 # SPDX-License-Identifier: CC0-1.0
 font.family: sans-serif
-font.sans-serif: Ubuntu, DejaVu Sans
 image.cmap: viridis
 figure.autolayout : True
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 4b197385d..15a9d9e4f 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -52,6 +52,10 @@
 pypsa.pf.logger.setLevel(logging.WARNING)
 
 
+class ObjectiveValueError(Exception):
+    pass
+
+
 def add_land_use_constraint_perfect(n):
     """
     Add global constraints for tech capacity limit.
@@ -986,6 +990,19 @@ def extra_functionality(n, snapshots):
         custom_extra_functionality(n, snapshots, snakemake)
 
 
+def check_objective_value(n, solving):
+    check_objective = solving["check_objective"]
+    if check_objective["enable"]:
+        atol = check_objective["atol"]
+        rtol = check_objective["rtol"]
+        expected_value = check_objective["expected_value"]
+        if not np.isclose(n.objective, expected_value, atol=atol, rtol=rtol):
+            raise ObjectiveValueError(
+                f"Objective value {n.objective} differs from expected value "
+                f"{expected_value} by more than {atol}."
+            )
+
+
 def solve_network(n, config, params, solving, **kwargs):
     set_of_options = solving["solver"]["options"]
     cf_solving = solving["options"]
@@ -1034,10 +1051,13 @@ def solve_network(n, config, params, solving, **kwargs):
             **kwargs
         )
 
-    if status != "ok" and not rolling_horizon:
-        logger.warning(
-            f"Solving status '{status}' with termination condition '{condition}'"
-        )
+    if not rolling_horizon:
+        if status != "ok":
+            logger.warning(
+                f"Solving status '{status}' with termination condition '{condition}'"
+            )
+        check_objective_value(n, solving)
+
     if "infeasible" in condition:
         labels = n.model.compute_infeasibilities()
         logger.info(f"Labels:\n{labels}")