diff --git a/apps/abstraction/transformation.py b/apps/abstraction/transformation.py
index 7fd2637..835e8ed 100644
--- a/apps/abstraction/transformation.py
+++ b/apps/abstraction/transformation.py
@@ -404,6 +404,76 @@ def _transform_relay_hottis_modbus_to_abstract(payload: str) -> dict[str, Any]:
     """
     return {"power": payload.strip()}
 
+
+# ============================================================================
+# HANDLER FUNCTIONS: three_phase_powermeter - hottis_modbus technology
+# ============================================================================
+
+def _transform_three_phase_powermeter_hottis_modbus_to_vendor(payload: dict[str, Any]) -> dict[str, Any]:
+    """Transform abstract three_phase_powermeter payload to hottis_modbus format.
+
+    energy: float = Field(..., description="Total energy in kWh")
+    total_power: float = Field(..., description="Total power in W")
+    phase1_power: float = Field(..., description="Power for phase 1 in W")
+    phase2_power: float = Field(..., description="Power for phase 2 in W")
+    phase3_power: float = Field(..., description="Power for phase 3 in W")
+    phase1_voltage: float = Field(..., description="Voltage for phase 1 in V")
+    phase2_voltage: float = Field(..., description="Voltage for phase 2 in V")
+    phase3_voltage: float = Field(..., description="Voltage for phase 3 in V")
+    phase1_current: float = Field(..., description="Current for phase 1 in A")
+    phase2_current: float = Field(..., description="Current for phase 2 in A")
+    phase3_current: float = Field(..., description="Current for phase 3 in A")
+
+
+    """
+
+    vendor_payload = {
+        "energy": payload.get("energy", 0.0),
+        "total_power": payload.get("total_power", 0.0),
+        "phase1_power": payload.get("phase1_power", 0.0),
+        "phase2_power": payload.get("phase2_power", 0.0),
+        "phase3_power": payload.get("phase3_power", 0.0),
+        "phase1_voltage": payload.get("phase1_voltage", 0.0),
+        "phase2_voltage": payload.get("phase2_voltage", 0.0),
+        "phase3_voltage": payload.get("phase3_voltage", 0.0),
+        "phase1_current": payload.get("phase1_current", 0.0),
+        "phase2_current": payload.get("phase2_current", 0.0),
+        "phase3_current": payload.get("phase3_current", 0.0),
+    }
+
+    return vendor_payload
+
+
+def _transform_three_phase_powermeter_hottis_modbus_to_abstract(payload: str) -> dict[str, Any]:
+    """Transform hottis_modbus three_phase_powermeter payload to abstract format.
+    
+    Transformations:
+    - current_heating_setpoint -> target (as float)
+    - local_temperature -> current (as float)
+    - system_mode -> mode
+    
+    Example:
+    - zigbee2mqtt: {'current_heating_setpoint': 15, 'local_temperature': 23, 'system_mode': 'heat'}
+    - Abstract: {'target': 15.0, 'current': 23.0, 'mode': 'heat'}
+    """
+    payload = json.loads(payload)
+    abstract_payload = {
+        "energy": payload.get("energy", 0.0),
+        "total_power": payload.get("total_power", 0.0),
+        "phase1_power": payload.get("phase1_power", 0.0),
+        "phase2_power": payload.get("phase2_power", 0.0),
+        "phase3_power": payload.get("phase3_power", 0.0),
+        "phase1_voltage": payload.get("phase1_voltage", 0.0),
+        "phase2_voltage": payload.get("phase2_voltage", 0.0),
+        "phase3_voltage": payload.get("phase3_voltage", 0.0),
+        "phase1_current": payload.get("phase1_current", 0.0),
+        "phase2_current": payload.get("phase2_current", 0.0),
+        "phase3_current": payload.get("phase3_current", 0.0),
+    }
+    
+    return abstract_payload
+
+
 # ============================================================================
 # HANDLER FUNCTIONS: max technology (Homegear MAX!)
 # ============================================================================
@@ -513,6 +583,10 @@ TRANSFORM_HANDLERS: dict[tuple[str, str, str], TransformHandler] = {
     ("relay", "shelly", "to_abstract"): _transform_relay_shelly_to_abstract,
     ("relay", "hottis_modbus", "to_vendor"): _transform_relay_hottis_modbus_to_vendor,
     ("relay", "hottis_modbus", "to_abstract"): _transform_relay_hottis_modbus_to_abstract,
+
+    # Three-Phase Powermeter transformations
+    ("three_phase_powermeter", "hottis_modbus", "to_vendor"): _transform_three_phase_powermeter_hottis_modbus_to_vendor,
+    ("three_phase_powermeter", "hottis_modbus", "to_abstract"): _transform_three_phase_powermeter_hottis_modbus_to_abstract,
 }
 
 
diff --git a/config/devices.yaml b/config/devices.yaml
index 4300518..6d4dde2 100644
--- a/config/devices.yaml
+++ b/config/devices.yaml
@@ -796,8 +796,8 @@ devices:
 
 - device_id: powermeter_caroutlet
   name: Car Outlet
-  type: threephase_powermeter
-  cap_version: "threephase_powermeter@1.0.0"
+  type: three_phase_powermeter
+  cap_version: "three_phase_powermeter@1.0.0"
   technology: hottis_modbus
   topics:
     state: "caroutlet/powermeter"