diff --git a/homeassistant/components/lg_thinq/sensor.py b/homeassistant/components/lg_thinq/sensor.py
index 578611952ba..23eac6f3e76 100644
--- a/homeassistant/components/lg_thinq/sensor.py
+++ b/homeassistant/components/lg_thinq/sensor.py
@@ -622,6 +622,7 @@ ENERGY_USAGE_SENSORS: tuple[ThinQEnergySensorEntityDescription, ...] = (
         usage_period=USAGE_MONTHLY,
         start_date_fn=lambda today: today,
         end_date_fn=lambda today: today,
+        state_class=SensorStateClass.TOTAL_INCREASING,
     ),
     ThinQEnergySensorEntityDescription(
         key="last_month",
diff --git a/tests/components/lg_thinq/snapshots/test_sensor.ambr b/tests/components/lg_thinq/snapshots/test_sensor.ambr
index 4bf3609bdfc..5a8ecd34c70 100644
--- a/tests/components/lg_thinq/snapshots/test_sensor.ambr
+++ b/tests/components/lg_thinq/snapshots/test_sensor.ambr
@@ -477,7 +477,7 @@
     }),
     'area_id': None,
     'capabilities': dict({
-      'state_class': <SensorStateClass.TOTAL: 'total'>,
+      'state_class': <SensorStateClass.TOTAL_INCREASING: 'total_increasing'>,
     }),
     'config_entry_id': <ANY>,
     'config_subentry_id': <ANY>,
@@ -516,7 +516,7 @@
     'attributes': ReadOnlyDict({
       'device_class': 'energy',
       'friendly_name': 'Test air conditioner Energy this month',
-      'state_class': <SensorStateClass.TOTAL: 'total'>,
+      'state_class': <SensorStateClass.TOTAL_INCREASING: 'total_increasing'>,
       'unit_of_measurement': <UnitOfEnergy.WATT_HOUR: 'Wh'>,
     }),
     'context': <ANY>,