diff --git a/homeassistant/components/dsmr_reader/definitions.py b/homeassistant/components/dsmr_reader/definitions.py
index 5fda67e65a3..309f0d297ec 100644
--- a/homeassistant/components/dsmr_reader/definitions.py
+++ b/homeassistant/components/dsmr_reader/definitions.py
@@ -2,8 +2,14 @@
 
 from homeassistant.const import (
     CURRENCY_EURO,
+    DEVICE_CLASS_CURRENT,
+    DEVICE_CLASS_ENERGY,
+    DEVICE_CLASS_POWER,
+    DEVICE_CLASS_TIMESTAMP,
+    DEVICE_CLASS_VOLTAGE,
     ELECTRICAL_CURRENT_AMPERE,
     ENERGY_KILO_WATT_HOUR,
+    POWER_KILO_WATT,
     VOLT,
     VOLUME_CUBIC_METERS,
 )
@@ -26,243 +32,297 @@ def tariff_transform(value):
 DEFINITIONS = {
     "dsmr/reading/electricity_delivered_1": {
         "name": "Low tariff usage",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/reading/electricity_returned_1": {
         "name": "Low tariff returned",
-        "icon": "mdi:flash-outline",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/reading/electricity_delivered_2": {
         "name": "High tariff usage",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/reading/electricity_returned_2": {
         "name": "High tariff returned",
-        "icon": "mdi:flash-outline",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/reading/electricity_currently_delivered": {
         "name": "Current power usage",
-        "icon": "mdi:flash",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/electricity_currently_returned": {
         "name": "Current power return",
-        "icon": "mdi:flash-outline",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_delivered_l1": {
         "name": "Current power usage L1",
-        "icon": "mdi:flash",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_delivered_l2": {
         "name": "Current power usage L2",
-        "icon": "mdi:flash",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_delivered_l3": {
         "name": "Current power usage L3",
-        "icon": "mdi:flash",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_returned_l1": {
         "name": "Current power return L1",
-        "icon": "mdi:flash-outline",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_returned_l2": {
         "name": "Current power return L2",
-        "icon": "mdi:flash-outline",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/phase_currently_returned_l3": {
         "name": "Current power return L3",
-        "icon": "mdi:flash-outline",
-        "unit": "kW",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_POWER,
+        "unit": POWER_KILO_WATT,
     },
     "dsmr/reading/extra_device_delivered": {
         "name": "Gas meter usage",
+        "enable_default": True,
         "icon": "mdi:fire",
         "unit": VOLUME_CUBIC_METERS,
     },
     "dsmr/reading/phase_voltage_l1": {
         "name": "Current voltage L1",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_VOLTAGE,
         "unit": VOLT,
     },
     "dsmr/reading/phase_voltage_l2": {
         "name": "Current voltage L2",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_VOLTAGE,
         "unit": VOLT,
     },
     "dsmr/reading/phase_voltage_l3": {
         "name": "Current voltage L3",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_VOLTAGE,
         "unit": VOLT,
     },
     "dsmr/reading/phase_power_current_l1": {
         "name": "Phase power current L1",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_CURRENT,
         "unit": ELECTRICAL_CURRENT_AMPERE,
     },
     "dsmr/reading/phase_power_current_l2": {
         "name": "Phase power current L2",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_CURRENT,
         "unit": ELECTRICAL_CURRENT_AMPERE,
     },
     "dsmr/reading/phase_power_current_l3": {
         "name": "Phase power current L3",
-        "icon": "mdi:flash",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_CURRENT,
         "unit": ELECTRICAL_CURRENT_AMPERE,
     },
+    "dsmr/reading/timestamp": {
+        "name": "Telegram timestamp",
+        "enable_default": False,
+        "device_class": DEVICE_CLASS_TIMESTAMP,
+    },
     "dsmr/consumption/gas/delivered": {
         "name": "Gas usage",
+        "enable_default": True,
         "icon": "mdi:fire",
         "unit": VOLUME_CUBIC_METERS,
     },
     "dsmr/consumption/gas/currently_delivered": {
         "name": "Current gas usage",
+        "enable_default": True,
         "icon": "mdi:fire",
         "unit": VOLUME_CUBIC_METERS,
     },
     "dsmr/consumption/gas/read_at": {
         "name": "Gas meter read",
-        "icon": "mdi:clock",
-        "unit": "",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_TIMESTAMP,
     },
     "dsmr/day-consumption/electricity1": {
         "name": "Low tariff usage",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity2": {
         "name": "High tariff usage",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity1_returned": {
         "name": "Low tariff return",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity2_returned": {
         "name": "High tariff return",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity_merged": {
         "name": "Power usage total",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity_returned_merged": {
         "name": "Power return total",
-        "icon": "mdi:counter",
+        "enable_default": True,
+        "device_class": DEVICE_CLASS_ENERGY,
         "unit": ENERGY_KILO_WATT_HOUR,
     },
     "dsmr/day-consumption/electricity1_cost": {
         "name": "Low tariff cost",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/electricity2_cost": {
         "name": "High tariff cost",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/electricity_cost_merged": {
         "name": "Power total cost",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/gas": {
         "name": "Gas usage",
+        "enable_default": True,
         "icon": "mdi:counter",
         "unit": VOLUME_CUBIC_METERS,
     },
     "dsmr/day-consumption/gas_cost": {
         "name": "Gas cost",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/total_cost": {
         "name": "Total cost",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/energy_supplier_price_electricity_delivered_1": {
         "name": "Low tariff delivered price",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/energy_supplier_price_electricity_delivered_2": {
         "name": "High tariff delivered price",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/energy_supplier_price_electricity_returned_1": {
         "name": "Low tariff returned price",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/energy_supplier_price_electricity_returned_2": {
         "name": "High tariff returned price",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/day-consumption/energy_supplier_price_gas": {
         "name": "Gas price",
+        "enable_default": True,
         "icon": "mdi:currency-eur",
         "unit": CURRENCY_EURO,
     },
     "dsmr/meter-stats/dsmr_version": {
         "name": "DSMR version",
+        "enable_default": True,
         "icon": "mdi:alert-circle",
         "transform": dsmr_transform,
     },
     "dsmr/meter-stats/electricity_tariff": {
         "name": "Electricity tariff",
+        "enable_default": True,
         "icon": "mdi:flash",
         "transform": tariff_transform,
     },
     "dsmr/meter-stats/power_failure_count": {
         "name": "Power failure count",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/long_power_failure_count": {
         "name": "Long power failure count",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_sag_count_l1": {
         "name": "Voltage sag L1",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_sag_count_l2": {
         "name": "Voltage sag L2",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_sag_count_l3": {
         "name": "Voltage sag L3",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_swell_count_l1": {
         "name": "Voltage swell L1",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_swell_count_l2": {
         "name": "Voltage swell L2",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/voltage_swell_count_l3": {
         "name": "Voltage swell L3",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
     "dsmr/meter-stats/rejected_telegrams": {
         "name": "Rejected telegrams",
+        "enable_default": True,
         "icon": "mdi:flash",
     },
 }
diff --git a/homeassistant/components/dsmr_reader/sensor.py b/homeassistant/components/dsmr_reader/sensor.py
index 341451522d4..14234b49dbe 100644
--- a/homeassistant/components/dsmr_reader/sensor.py
+++ b/homeassistant/components/dsmr_reader/sensor.py
@@ -31,6 +31,8 @@ class DSMRSensor(Entity):
         self._topic = topic
 
         self._name = self._definition.get("name", topic.split("/")[-1])
+        self._device_class = self._definition.get("device_class")
+        self._enable_default = self._definition.get("enable_default")
         self._unit_of_measurement = self._definition.get("unit")
         self._icon = self._definition.get("icon")
         self._transform = self._definition.get("transform")
@@ -67,11 +69,21 @@ class DSMRSensor(Entity):
         """Return the current state of the entity."""
         return self._state
 
+    @property
+    def device_class(self):
+        """Return the device_class of this sensor."""
+        return self._device_class
+
     @property
     def unit_of_measurement(self):
         """Return the unit_of_measurement of this sensor."""
         return self._unit_of_measurement
 
+    @property
+    def entity_registry_enabled_default(self) -> bool:
+        """Return if the entity should be enabled when first added to the entity registry."""
+        return self._enable_default
+
     @property
     def icon(self):
         """Return the icon of this sensor."""