diff --git a/homeassistant/components/kostal_plenticore/const.py b/homeassistant/components/kostal_plenticore/const.py
index ede8e10cb25..5cbc1a2af79 100644
--- a/homeassistant/components/kostal_plenticore/const.py
+++ b/homeassistant/components/kostal_plenticore/const.py
@@ -1,9 +1,9 @@
 """Constants for the Kostal Plenticore Solar Inverter integration."""
 
 from homeassistant.components.sensor import (
-    ATTR_LAST_RESET,
     ATTR_STATE_CLASS,
     STATE_CLASS_MEASUREMENT,
+    STATE_CLASS_TOTAL_INCREASING,
 )
 from homeassistant.const import (
     ATTR_DEVICE_CLASS,
@@ -304,8 +304,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -346,8 +345,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -388,8 +386,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -430,8 +427,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -472,8 +468,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -514,8 +509,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -556,8 +550,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
@@ -599,8 +592,7 @@ SENSOR_PROCESS_DATA = [
         {
             ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
             ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-            ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
-            ATTR_LAST_RESET: LAST_RESET_NEVER,
+            ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
         },
         "format_energy",
     ),
diff --git a/homeassistant/components/kostal_plenticore/sensor.py b/homeassistant/components/kostal_plenticore/sensor.py
index 57b37e51d11..19ac4db0f90 100644
--- a/homeassistant/components/kostal_plenticore/sensor.py
+++ b/homeassistant/components/kostal_plenticore/sensor.py
@@ -1,15 +1,11 @@
 """Platform for Kostal Plenticore sensors."""
 from __future__ import annotations
 
-from datetime import datetime, timedelta
+from datetime import timedelta
 import logging
 from typing import Any, Callable
 
-from homeassistant.components.sensor import (
-    ATTR_LAST_RESET,
-    ATTR_STATE_CLASS,
-    SensorEntity,
-)
+from homeassistant.components.sensor import ATTR_STATE_CLASS, SensorEntity
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import ATTR_DEVICE_CLASS, ATTR_ICON, ATTR_UNIT_OF_MEASUREMENT
 from homeassistant.core import HomeAssistant
@@ -193,11 +189,6 @@ class PlenticoreDataSensor(CoordinatorEntity, SensorEntity):
         """Return if the entity should be enabled when first added to the entity registry."""
         return self._sensor_data.get(ATTR_ENABLED_DEFAULT, False)
 
-    @property
-    def last_reset(self) -> datetime | None:
-        """Return the last_reset time."""
-        return self._sensor_data.get(ATTR_LAST_RESET)
-
     @property
     def native_value(self) -> Any | None:
         """Return the state of the sensor."""