diff --git a/homeassistant/helpers/entity_platform.py b/homeassistant/helpers/entity_platform.py
index 46918715e87..d4fa567e929 100644
--- a/homeassistant/helpers/entity_platform.py
+++ b/homeassistant/helpers/entity_platform.py
@@ -883,7 +883,6 @@ class EntityPlatform:
                 get_initial_options=entity.get_initial_entity_options,
                 has_entity_name=entity.has_entity_name,
                 hidden_by=hidden_by,
-                known_object_ids=self.entities,
                 original_device_class=entity.device_class,
                 original_icon=entity.icon,
                 original_name=entity_name,
@@ -927,7 +926,7 @@ class EntityPlatform:
                         f"{self.entity_namespace} {suggested_object_id}"
                     )
                 entity.entity_id = entity_registry.async_generate_entity_id(
-                    self.domain, suggested_object_id, self.entities
+                    self.domain, suggested_object_id
                 )
 
             # Make sure it is valid in case an entity set the value themselves
diff --git a/homeassistant/helpers/entity_registry.py b/homeassistant/helpers/entity_registry.py
index cdadc06d323..78a65acf290 100644
--- a/homeassistant/helpers/entity_registry.py
+++ b/homeassistant/helpers/entity_registry.py
@@ -11,7 +11,7 @@ timer.
 from __future__ import annotations
 
 from collections import defaultdict
-from collections.abc import Callable, Container, Hashable, KeysView, Mapping
+from collections.abc import Callable, Hashable, KeysView, Mapping
 from datetime import datetime, timedelta
 from enum import StrEnum
 import logging
@@ -787,26 +787,18 @@ class EntityRegistry(BaseRegistry):
         """Return known device ids."""
         return list(self.entities.get_device_ids())
 
-    def _entity_id_available(
-        self, entity_id: str, known_object_ids: Container[str] | None
-    ) -> bool:
+    def _entity_id_available(self, entity_id: str) -> bool:
         """Return True if the entity_id is available.
 
         An entity_id is available if:
         - It's not registered
-        - It's not known by the entity component adding the entity
-        - It's not in the state machine
+        - It's available (not in the state machine and not reserved)
 
         Note that an entity_id which belongs to a deleted entity is considered
         available.
         """
-        if known_object_ids is None:
-            known_object_ids = {}
-
-        return (
-            entity_id not in self.entities
-            and entity_id not in known_object_ids
-            and self.hass.states.async_available(entity_id)
+        return entity_id not in self.entities and self.hass.states.async_available(
+            entity_id
         )
 
     @callback
@@ -814,7 +806,6 @@ class EntityRegistry(BaseRegistry):
         self,
         domain: str,
         suggested_object_id: str,
-        known_object_ids: Container[str] | None = None,
     ) -> str:
         """Generate an entity ID that does not conflict.
 
@@ -826,11 +817,9 @@ class EntityRegistry(BaseRegistry):
             raise MaxLengthExceeded(domain, "domain", MAX_LENGTH_STATE_DOMAIN)
 
         test_string = preferred_string[:MAX_LENGTH_STATE_ENTITY_ID]
-        if known_object_ids is None:
-            known_object_ids = set()
 
         tries = 1
-        while not self._entity_id_available(test_string, known_object_ids):
+        while not self._entity_id_available(test_string):
             tries += 1
             len_suffix = len(str(tries)) + 1
             test_string = (
@@ -847,7 +836,6 @@ class EntityRegistry(BaseRegistry):
         unique_id: str,
         *,
         # To influence entity ID generation
-        known_object_ids: Container[str] | None = None,
         suggested_object_id: str | None = None,
         # To disable or hide an entity if it gets created
         disabled_by: RegistryEntryDisabler | None = None,
@@ -921,7 +909,6 @@ class EntityRegistry(BaseRegistry):
         entity_id = self.async_generate_entity_id(
             domain,
             suggested_object_id or f"{platform}_{unique_id}",
-            known_object_ids,
         )
 
         if (
@@ -1164,7 +1151,7 @@ class EntityRegistry(BaseRegistry):
             )
 
         if new_entity_id is not UNDEFINED and new_entity_id != old.entity_id:
-            if not self._entity_id_available(new_entity_id, None):
+            if not self._entity_id_available(new_entity_id):
                 raise ValueError("Entity with this ID is already registered")
 
             if not valid_entity_id(new_entity_id):
diff --git a/tests/helpers/test_entity_registry.py b/tests/helpers/test_entity_registry.py
index dd27c0eff0d..7df7bb398e8 100644
--- a/tests/helpers/test_entity_registry.py
+++ b/tests/helpers/test_entity_registry.py
@@ -2017,7 +2017,9 @@ async def test_disabled_entities_excluded_from_entity_list(
     ) == [entry1, entry2]
 
 
-async def test_entity_max_length_exceeded(entity_registry: er.EntityRegistry) -> None:
+async def test_entity_max_length_exceeded(
+    hass: HomeAssistant, entity_registry: er.EntityRegistry
+) -> None:
     """Test that an exception is raised when the max character length is exceeded."""
 
     long_domain_name = (
@@ -2042,20 +2044,13 @@ async def test_entity_max_length_exceeded(entity_registry: er.EntityRegistry) ->
         "1234567890123456789012345678901234567"
     )
 
-    known = []
-    new_id = entity_registry.async_generate_entity_id(
-        "sensor", long_entity_id_name, known
-    )
+    new_id = entity_registry.async_generate_entity_id("sensor", long_entity_id_name)
     assert new_id == "sensor." + long_entity_id_name[: 255 - 7]
-    known.append(new_id)
-    new_id = entity_registry.async_generate_entity_id(
-        "sensor", long_entity_id_name, known
-    )
+    hass.states.async_reserve(new_id)
+    new_id = entity_registry.async_generate_entity_id("sensor", long_entity_id_name)
     assert new_id == "sensor." + long_entity_id_name[: 255 - 7 - 2] + "_2"
-    known.append(new_id)
-    new_id = entity_registry.async_generate_entity_id(
-        "sensor", long_entity_id_name, known
-    )
+    hass.states.async_reserve(new_id)
+    new_id = entity_registry.async_generate_entity_id("sensor", long_entity_id_name)
     assert new_id == "sensor." + long_entity_id_name[: 255 - 7 - 2] + "_3"