diff --git a/homeassistant/components/teslemetry/sensor.py b/homeassistant/components/teslemetry/sensor.py
index 0fb0a6ee0e0..dd83ad04ed6 100644
--- a/homeassistant/components/teslemetry/sensor.py
+++ b/homeassistant/components/teslemetry/sensor.py
@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from dataclasses import dataclass
-from datetime import timedelta
+from datetime import datetime, timedelta
 
 from propcache.api import cached_property
 from teslemetry_stream import Signal
@@ -369,8 +369,16 @@ VEHICLE_TIME_DESCRIPTIONS: tuple[TeslemetryTimeEntityDescription, ...] = (
     ),
 )
 
-ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
-    SensorEntityDescription(
+
+@dataclass(frozen=True, kw_only=True)
+class TeslemetryEnergySensorEntityDescription(SensorEntityDescription):
+    """Describes Teslemetry Sensor entity."""
+
+    value_fn: Callable[[StateType], StateType | datetime] = lambda x: x
+
+
+ENERGY_LIVE_DESCRIPTIONS: tuple[TeslemetryEnergySensorEntityDescription, ...] = (
+    TeslemetryEnergySensorEntityDescription(
         key="solar_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -378,7 +386,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         suggested_display_precision=2,
         device_class=SensorDeviceClass.POWER,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="energy_left",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfEnergy.WATT_HOUR,
@@ -387,7 +395,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         device_class=SensorDeviceClass.ENERGY_STORAGE,
         entity_category=EntityCategory.DIAGNOSTIC,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="total_pack_energy",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfEnergy.WATT_HOUR,
@@ -397,14 +405,15 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="percentage_charged",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=PERCENTAGE,
         device_class=SensorDeviceClass.BATTERY,
         suggested_display_precision=2,
+        value_fn=lambda value: value or 0,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="battery_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -412,7 +421,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         suggested_display_precision=2,
         device_class=SensorDeviceClass.POWER,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="load_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -420,7 +429,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         suggested_display_precision=2,
         device_class=SensorDeviceClass.POWER,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="grid_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -428,7 +437,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         suggested_display_precision=2,
         device_class=SensorDeviceClass.POWER,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="grid_services_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -436,7 +445,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         suggested_display_precision=2,
         device_class=SensorDeviceClass.POWER,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="generator_power",
         state_class=SensorStateClass.MEASUREMENT,
         native_unit_of_measurement=UnitOfPower.WATT,
@@ -445,7 +454,7 @@ ENERGY_LIVE_DESCRIPTIONS: tuple[SensorEntityDescription, ...] = (
         device_class=SensorDeviceClass.POWER,
         entity_registry_enabled_default=False,
     ),
-    SensorEntityDescription(
+    TeslemetryEnergySensorEntityDescription(
         key="island_status",
         device_class=SensorDeviceClass.ENUM,
         options=[
@@ -555,6 +564,7 @@ async def async_setup_entry(
         if energysite.live_coordinator
         for description in ENERGY_LIVE_DESCRIPTIONS
         if description.key in energysite.live_coordinator.data
+        or description.key == "percentage_charged"
     )
 
     entities.extend(
@@ -704,12 +714,12 @@ class TeslemetryVehicleTimeSensorEntity(TeslemetryVehicleEntity, SensorEntity):
 class TeslemetryEnergyLiveSensorEntity(TeslemetryEnergyLiveEntity, SensorEntity):
     """Base class for Teslemetry energy site metric sensors."""
 
-    entity_description: SensorEntityDescription
+    entity_description: TeslemetryEnergySensorEntityDescription
 
     def __init__(
         self,
         data: TeslemetryEnergyData,
-        description: SensorEntityDescription,
+        description: TeslemetryEnergySensorEntityDescription,
     ) -> None:
         """Initialize the sensor."""
         self.entity_description = description
@@ -718,7 +728,7 @@ class TeslemetryEnergyLiveSensorEntity(TeslemetryEnergyLiveEntity, SensorEntity)
     def _async_update_attrs(self) -> None:
         """Update the attributes of the sensor."""
         self._attr_available = not self.is_none
-        self._attr_native_value = self._value
+        self._attr_native_value = self.entity_description.value_fn(self._value)
 
 
 class TeslemetryWallConnectorSensorEntity(TeslemetryWallConnectorEntity, SensorEntity):