diff --git a/config/config.default.yaml b/config/config.default.yaml
index b2828a44..bd9cefb5 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -667,7 +667,7 @@ industry:
 # docs in https://pypsa-eur.readthedocs.io/en/latest/configuration.html#costs
 costs:
   year: 2030
-  version: v0.8.0
+  version: v0.8.1
   rooftop_share: 0.14  # based on the potentials, assuming  (0.1 kW/m2 and 10 m2/person)
   social_discountrate: 0.02
   fill_values:
diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index d6072d7d..8167f6dd 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -9,6 +9,7 @@ Release Notes
 
 Upcoming Release
 ================
+* Upgrade default techno-economic assumptions to ``technology-data`` v0.8.1.
 
 * Linearly interpolate missing investment periods in year-dependent
   configuration options.
diff --git a/scripts/add_existing_baseyear.py b/scripts/add_existing_baseyear.py
index 750ab22f..44c9b20e 100644
--- a/scripts/add_existing_baseyear.py
+++ b/scripts/add_existing_baseyear.py
@@ -417,6 +417,11 @@ def add_heating_capacities_installed_before_baseyear(
 
         nodes = pd.Index(n.buses.location[n.buses.index.str.contains(f"{name} heat")])
 
+        if (name_type != "central") and options["electricity_distribution_grid"]:
+            nodes_elec = nodes + " low voltage"
+        else:
+            nodes_elec = nodes
+
         heat_pump_type = "air" if "urban" in name else "ground"
 
         # Add heat pumps
@@ -440,7 +445,7 @@ def add_heating_capacities_installed_before_baseyear(
                 "Link",
                 nodes,
                 suffix=f" {name} {heat_pump_type} heat pump-{grouping_year}",
-                bus0=nodes,
+                bus0=nodes_elec,
                 bus1=nodes + " " + name + " heat",
                 carrier=f"{name} {heat_pump_type} heat pump",
                 efficiency=efficiency,
@@ -458,7 +463,7 @@ def add_heating_capacities_installed_before_baseyear(
                 "Link",
                 nodes,
                 suffix=f" {name} resistive heater-{grouping_year}",
-                bus0=nodes,
+                bus0=nodes_elec,
                 bus1=nodes + " " + name + " heat",
                 carrier=name + " resistive heater",
                 efficiency=costs.at[f"{name_type} resistive heater", "efficiency"],
@@ -541,6 +546,7 @@ def add_heating_capacities_installed_before_baseyear(
             )
 
 
+# %%
 if __name__ == "__main__":
     if "snakemake" not in globals():
         from _helpers import mock_snakemake
@@ -552,7 +558,7 @@ if __name__ == "__main__":
             clusters="37",
             ll="v1.0",
             opts="",
-            sector_opts="1p7-4380H-T-H-B-I-A-dist1",
+            sector_opts="8760-T-H-B-I-A-dist1",
             planning_horizons=2020,
         )
 
diff --git a/scripts/cluster_network.py b/scripts/cluster_network.py
index be315a63..757184b2 100644
--- a/scripts/cluster_network.py
+++ b/scripts/cluster_network.py
@@ -267,7 +267,7 @@ def distribute_clusters(n, n_clusters, focus_weights=None, solver_name="scip"):
     m.objective = (clusters * clusters - 2 * clusters * L * n_clusters).sum()
     if solver_name == "gurobi":
         logging.getLogger("gurobipy").propagate = False
-    elif solver_name != "scip":
+    elif solver_name not in ["scip", "cplex"]:
         logger.info(
             f"The configured solver `{solver_name}` does not support quadratic objectives. Falling back to `scip`."
         )