diff --git a/config/config.validation.yaml b/config/config.validation.yaml
index c1f59588..5b259c04 100644
--- a/config/config.validation.yaml
+++ b/config/config.validation.yaml
@@ -584,7 +584,7 @@ costs:
     battery: 0.
     battery inverter: 0.
   emission_prices: # in currency per tonne emission, only used with the option Ep
-    co2: 0.
+    co2: 25
 
 clustering:
   simplify_network:
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 466c8730..a4b2ce5f 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -38,7 +38,6 @@ from _helpers import (
     override_component_attrs,
     update_config_with_sector_opts,
 )
-from vresutils.benchmark import memory_logger
 
 logger = logging.getLogger(__name__)
 pypsa.pf.logger.setLevel(logging.WARNING)
@@ -688,22 +687,20 @@ if __name__ == "__main__":
     np.random.seed(solve_opts.get("seed", 123))
 
     fn = getattr(snakemake.log, "memory", None)
-    with memory_logger(filename=fn, interval=30.0) as mem:
-        if "overrides" in snakemake.input.keys():
-            overrides = override_component_attrs(snakemake.input.overrides)
-            n = pypsa.Network(
-                snakemake.input.network, override_component_attrs=overrides
-            )
-        else:
-            n = pypsa.Network(snakemake.input.network)
 
-        n = prepare_network(n, solve_opts, config=snakemake.config)
+    if "overrides" in snakemake.input.keys():
+        overrides = override_component_attrs(snakemake.input.overrides)
+        n = pypsa.Network(snakemake.input.network, override_component_attrs=overrides)
+    else:
+        n = pypsa.Network(snakemake.input.network)
 
-        n = solve_network(
-            n, config=snakemake.config, opts=opts, log_fn=snakemake.log.solver
-        )
+    n = prepare_network(n, solve_opts, config=snakemake.config)
 
-        n.meta = dict(snakemake.config, **dict(wildcards=dict(snakemake.wildcards)))
-        n.export_to_netcdf(snakemake.output[0])
+    n = solve_network(
+        n, config=snakemake.config, opts=opts, log_fn=snakemake.log.solver
+    )
+
+    n.meta = dict(snakemake.config, **dict(wildcards=dict(snakemake.wildcards)))
+    n.export_to_netcdf(snakemake.output[0])
 
     logger.info("Maximum memory usage: {}".format(mem.mem_usage))