diff --git a/homeassistant/components/efergy/sensor.py b/homeassistant/components/efergy/sensor.py
index 809f1c531da798..dd8752dde7f70e 100644
--- a/homeassistant/components/efergy/sensor.py
+++ b/homeassistant/components/efergy/sensor.py
@@ -96,7 +96,7 @@
     ),
     SensorEntityDescription(
         key=CONF_CURRENT_VALUES,
-        name="Power Usage",
+        translation_key="power_usage",
         device_class=SensorDeviceClass.POWER,
         native_unit_of_measurement=UnitOfPower.WATT,
         state_class=SensorStateClass.MEASUREMENT,
@@ -156,7 +156,8 @@ def __init__(
         super().__init__(api, server_unique_id)
         self.entity_description = description
         if description.key == CONF_CURRENT_VALUES:
-            self._attr_name = f"{description.name}_{'' if sid is None else sid}"
+            assert sid is not None
+            self._attr_translation_placeholders = {"sid": str(sid)}
         self._attr_unique_id = (
             f"{server_unique_id}/{description.key}_{'' if sid is None else sid}"
         )
diff --git a/homeassistant/components/efergy/strings.json b/homeassistant/components/efergy/strings.json
index 3b17bf07f1ae4d..612c964487b8de 100644
--- a/homeassistant/components/efergy/strings.json
+++ b/homeassistant/components/efergy/strings.json
@@ -48,6 +48,9 @@
       },
       "cost_year": {
         "name": "Yearly energy cost"
+      },
+      "power_usage": {
+        "name": "Power usage {sid}"
       }
     }
   }