diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 454d73f8f..57829de8f 100755
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -502,6 +502,8 @@ Changed
   `#1110 <https://github.com/openego/eGon-data/issues/1110>`_
 * Use MaStR geocoding results for pv rooftop to buildings mapping workflow
   `#1095 <https://github.com/openego/eGon-data/issues/1095>`_
+* Rename eMob MIT carrier names (use underscores)
+  `#1105 <https://github.com/openego/eGon-data/issues/1105>`_
 
 .. _#799: https://github.com/openego/eGon-data/issues/799
 
diff --git a/src/egon/data/datasets/power_plants/__init__.py b/src/egon/data/datasets/power_plants/__init__.py
index 672431240..71213e66f 100755
--- a/src/egon/data/datasets/power_plants/__init__.py
+++ b/src/egon/data/datasets/power_plants/__init__.py
@@ -59,7 +59,7 @@ class PowerPlants(Dataset):
     def __init__(self, dependencies):
         super().__init__(
             name="PowerPlants",
-            version="0.0.17",
+            version="0.0.18",
             dependencies=dependencies,
             tasks=(
                 create_tables,
diff --git a/src/egon/data/datasets/power_plants/mastr.py b/src/egon/data/datasets/power_plants/mastr.py
index 19f2d9b36..225c7c685 100644
--- a/src/egon/data/datasets/power_plants/mastr.py
+++ b/src/egon/data/datasets/power_plants/mastr.py
@@ -473,10 +473,11 @@ def import_mastr() -> None:
 
         units = units.loc[units.geometry.within(boundary)]
 
-        logger.debug(
-            f"{init_len - len(units)}/{init_len} "
-            f"({((init_len - len(units)) / init_len) * 100: g} %) dropped."
-        )
+        if init_len > 0:
+            logger.debug(
+                f"{init_len - len(units)}/{init_len} "
+                f"({((init_len - len(units)) / init_len) * 100: g} %) dropped."
+            )
 
         # drop unnecessary and rename columns
         logger.debug("Reformatting...")
@@ -499,7 +500,7 @@ def import_mastr() -> None:
         units["voltage_level"] = units.voltage_level.fillna(-1).astype(int)
 
         units.set_geometry("geom", inplace=True)
-        units["id"] = range(0, len(units))
+        units["id"] = range(len(units))
 
         # change capacity unit: kW to MW
         units["capacity"] = units["capacity"] / 1e3
diff --git a/src/egon/data/datasets/power_plants/pv_rooftop_buildings.py b/src/egon/data/datasets/power_plants/pv_rooftop_buildings.py
index 9794b19dc..0c625a992 100644
--- a/src/egon/data/datasets/power_plants/pv_rooftop_buildings.py
+++ b/src/egon/data/datasets/power_plants/pv_rooftop_buildings.py
@@ -2182,6 +2182,46 @@ def add_bus_ids_sq(
     return buildings_gdf
 
 
+def infer_voltage_level(
+    units_gdf: gpd.GeoDataFrame,
+) -> gpd.GeoDataFrame:
+    """
+    Infer nan values in voltage level derived from generator capacity to
+    the power plants.
+
+    Parameters
+    -----------
+    units_gdf : geopandas.GeoDataFrame
+        GeoDataFrame containing units with voltage levels from MaStR
+    Returnsunits_gdf: gpd.GeoDataFrame
+    -------
+    geopandas.GeoDataFrame
+        GeoDataFrame containing units all having assigned a voltage level.
+    """
+
+    def voltage_levels(p: float) -> int:
+        if p <= 0.1:
+            return 7
+        elif p <= 0.2:
+            return 6
+        elif p <= 5.5:
+            return 5
+        elif p <= 20:
+            return 4
+        elif p <= 120:
+            return 3
+        return 1
+
+    units_gdf["voltage_level_inferred"] = False
+    mask = units_gdf.voltage_level.isna()
+    units_gdf.loc[mask, "voltage_level_inferred"] = True
+    units_gdf.loc[mask, "voltage_level"] = units_gdf.loc[mask].capacity.apply(
+        voltage_levels
+    )
+
+    return units_gdf
+
+
 def pv_rooftop_to_buildings():
     """Main script, executed as task"""
 
@@ -2234,4 +2274,4 @@ def pv_rooftop_to_buildings():
     all_buildings_gdf = add_bus_ids_sq(all_buildings_gdf)
 
     # export scenario
-    create_scenario_table(all_buildings_gdf)
+    create_scenario_table(infer_voltage_level(all_buildings_gdf))