diff --git a/homeassistant/components/edl21/sensor.py b/homeassistant/components/edl21/sensor.py
index 35992b96104..68b874149a7 100644
--- a/homeassistant/components/edl21/sensor.py
+++ b/homeassistant/components/edl21/sensor.py
@@ -27,7 +27,7 @@ from homeassistant.const import (
     UnitOfPower,
 )
 from homeassistant.core import HomeAssistant, callback
-from homeassistant.helpers import config_validation as cv, entity_registry as er
+from homeassistant.helpers import config_validation as cv
 from homeassistant.helpers.dispatcher import (
     async_dispatcher_connect,
     async_dispatcher_send,
@@ -397,30 +397,7 @@ class EDL21:
                     self._OBIS_BLACKLIST.add(obis)
 
         if new_entities:
-            self._hass.loop.create_task(self.add_entities(new_entities))
-
-    async def add_entities(self, new_entities: list[EDL21Entity]) -> None:
-        """Migrate old unique IDs, then add entities to hass."""
-        registry = er.async_get(self._hass)
-
-        for entity in new_entities:
-            old_entity_id = registry.async_get_entity_id(
-                "sensor", DOMAIN, entity.old_unique_id
-            )
-            if old_entity_id is not None and entity.unique_id is not None:
-                LOGGER.debug(
-                    "Migrating unique_id from [%s] to [%s]",
-                    entity.old_unique_id,
-                    entity.unique_id,
-                )
-                if registry.async_get_entity_id("sensor", DOMAIN, entity.unique_id):
-                    registry.async_remove(old_entity_id)
-                else:
-                    registry.async_update_entity(
-                        old_entity_id, new_unique_id=entity.unique_id
-                    )
-
-        self._async_add_entities(new_entities, update_before_add=True)
+            self._async_add_entities(new_entities, update_before_add=True)
 
 
 class EDL21Entity(SensorEntity):
@@ -480,18 +457,13 @@ class EDL21Entity(SensorEntity):
         if self._async_remove_dispatcher:
             self._async_remove_dispatcher()
 
-    @property
-    def old_unique_id(self) -> str:
-        """Return a less unique ID as used in the first version of edl21."""
-        return self._obis
-
     @property
     def native_value(self) -> str:
         """Return the value of the last received telegram."""
         return self._telegram.get("value")
 
     @property
-    def extra_state_attributes(self):
+    def extra_state_attributes(self) -> Mapping[str, Any]:
         """Enumerate supported attributes."""
         return {
             self._state_attrs[k]: v
@@ -500,7 +472,7 @@ class EDL21Entity(SensorEntity):
         }
 
     @property
-    def native_unit_of_measurement(self):
+    def native_unit_of_measurement(self) -> str | None:
         """Return the unit of measurement."""
         if (unit := self._telegram.get("unit")) is None or unit == 0:
             return None