diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index a8e6c0472e9..7c682486f04 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -3,12 +3,15 @@ from __future__ import annotations
 
 from collections import namedtuple
 from collections.abc import Sequence
-from datetime import datetime
 
 from pysmartthings import Attribute, Capability
 from pysmartthings.device import DeviceEntity
 
-from homeassistant.components.sensor import STATE_CLASS_MEASUREMENT, SensorEntity
+from homeassistant.components.sensor import (
+    STATE_CLASS_MEASUREMENT,
+    STATE_CLASS_TOTAL_INCREASING,
+    SensorEntity,
+)
 from homeassistant.const import (
     AREA_SQUARE_METERS,
     CONCENTRATION_PARTS_PER_MILLION,
@@ -33,7 +36,6 @@ from homeassistant.const import (
     TEMP_FAHRENHEIT,
     VOLUME_CUBIC_METERS,
 )
-from homeassistant.util.dt import utc_from_timestamp
 
 from . import SmartThingsEntity
 from .const import DATA_BROKERS, DOMAIN
@@ -133,7 +135,7 @@ CAPABILITY_TO_SENSORS = {
             "Energy Meter",
             ENERGY_KILO_WATT_HOUR,
             DEVICE_CLASS_ENERGY,
-            STATE_CLASS_MEASUREMENT,
+            STATE_CLASS_TOTAL_INCREASING,
         )
     ],
     Capability.equivalent_carbon_dioxide_measurement: [
@@ -507,13 +509,6 @@ class SmartThingsSensor(SmartThingsEntity, SensorEntity):
         unit = self._device.status.attributes[self._attribute].unit
         return UNITS.get(unit, unit) if unit else self._default_unit
 
-    @property
-    def last_reset(self) -> datetime | None:
-        """Return the time when the sensor was last reset, if any."""
-        if self._attribute == Attribute.energy:
-            return utc_from_timestamp(0)
-        return None
-
 
 class SmartThingsThreeAxisSensor(SmartThingsEntity, SensorEntity):
     """Define a SmartThings Three Axis Sensor."""
@@ -554,8 +549,9 @@ class SmartThingsPowerConsumptionSensor(SmartThingsEntity, SensorEntity):
         """Init the class."""
         super().__init__(device)
         self.report_name = report_name
-        # This is an exception for STATE_CLASS_MEASUREMENT per @balloob
         self._attr_state_class = STATE_CLASS_MEASUREMENT
+        if self.report_name != "power":
+            self._attr_state_class = STATE_CLASS_TOTAL_INCREASING
 
     @property
     def name(self) -> str:
@@ -590,10 +586,3 @@ class SmartThingsPowerConsumptionSensor(SmartThingsEntity, SensorEntity):
         if self.report_name == "power":
             return POWER_WATT
         return ENERGY_KILO_WATT_HOUR
-
-    @property
-    def last_reset(self) -> datetime | None:
-        """Return the time when the sensor was last reset, if any."""
-        if self.report_name != "power":
-            return utc_from_timestamp(0)
-        return None