diff --git a/homeassistant/components/forecast_solar/const.py b/homeassistant/components/forecast_solar/const.py
index e23072f0bec..0e47fa9701b 100644
--- a/homeassistant/components/forecast_solar/const.py
+++ b/homeassistant/components/forecast_solar/const.py
@@ -28,6 +28,15 @@ SENSORS: tuple[ForecastSolarSensorEntityDescription, ...] = (
         suggested_unit_of_measurement=UnitOfEnergy.KILO_WATT_HOUR,
         suggested_display_precision=1,
     ),
+    ForecastSolarSensorEntityDescription(
+        key="energy_production_today_remaining",
+        name="Estimated energy production - remaining today",
+        state=lambda estimate: estimate.energy_production_today_remaining,
+        device_class=SensorDeviceClass.ENERGY,
+        native_unit_of_measurement=UnitOfEnergy.WATT_HOUR,
+        suggested_unit_of_measurement=UnitOfEnergy.KILO_WATT_HOUR,
+        suggested_display_precision=1,
+    ),
     ForecastSolarSensorEntityDescription(
         key="energy_production_tomorrow",
         name="Estimated energy production - tomorrow",
diff --git a/homeassistant/components/forecast_solar/diagnostics.py b/homeassistant/components/forecast_solar/diagnostics.py
index d14136103a4..970747253df 100644
--- a/homeassistant/components/forecast_solar/diagnostics.py
+++ b/homeassistant/components/forecast_solar/diagnostics.py
@@ -34,6 +34,7 @@ async def async_get_config_entry_diagnostics(
         },
         "data": {
             "energy_production_today": coordinator.data.energy_production_today,
+            "energy_production_today_remaining": coordinator.data.energy_production_today_remaining,
             "energy_production_tomorrow": coordinator.data.energy_production_tomorrow,
             "energy_current_hour": coordinator.data.energy_current_hour,
             "power_production_now": coordinator.data.power_production_now,
diff --git a/tests/components/forecast_solar/conftest.py b/tests/components/forecast_solar/conftest.py
index 26c1ae7ba36..60e9c9dc5d0 100644
--- a/tests/components/forecast_solar/conftest.py
+++ b/tests/components/forecast_solar/conftest.py
@@ -72,6 +72,7 @@ def mock_forecast_solar(hass) -> Generator[None, MagicMock, None]:
         estimate.api_rate_limit = 60
         estimate.account_type.value = "public"
         estimate.energy_production_today = 100000
+        estimate.energy_production_today_remaining = 50000
         estimate.energy_production_tomorrow = 200000
         estimate.power_production_now = 300000
         estimate.power_highest_peak_time_today = datetime(
diff --git a/tests/components/forecast_solar/test_diagnostics.py b/tests/components/forecast_solar/test_diagnostics.py
index 4ef25379497..4900c3bdb32 100644
--- a/tests/components/forecast_solar/test_diagnostics.py
+++ b/tests/components/forecast_solar/test_diagnostics.py
@@ -34,6 +34,7 @@ async def test_diagnostics(
         },
         "data": {
             "energy_production_today": 100000,
+            "energy_production_today_remaining": 50000,
             "energy_production_tomorrow": 200000,
             "energy_current_hour": 800000,
             "power_production_now": 300000,
diff --git a/tests/components/forecast_solar/test_sensor.py b/tests/components/forecast_solar/test_sensor.py
index 39d9103c486..4539619febc 100644
--- a/tests/components/forecast_solar/test_sensor.py
+++ b/tests/components/forecast_solar/test_sensor.py
@@ -48,6 +48,21 @@ async def test_sensors(
     assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.ENERGY
     assert ATTR_ICON not in state.attributes
 
+    state = hass.states.get("sensor.energy_production_today_remaining")
+    entry = entity_registry.async_get("sensor.energy_production_today_remaining")
+    assert entry
+    assert state
+    assert entry.unique_id == f"{entry_id}_energy_production_today_remaining"
+    assert state.state == "50.0"
+    assert (
+        state.attributes.get(ATTR_FRIENDLY_NAME)
+        == "Solar production forecast Estimated energy production - remaining today"
+    )
+    assert state.attributes.get(ATTR_STATE_CLASS) is None
+    assert state.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == UnitOfEnergy.KILO_WATT_HOUR
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.ENERGY
+    assert ATTR_ICON not in state.attributes
+
     state = hass.states.get("sensor.energy_production_tomorrow")
     entry = entity_registry.async_get("sensor.energy_production_tomorrow")
     assert entry