diff --git a/homeassistant/components/iotawatt/coordinator.py b/homeassistant/components/iotawatt/coordinator.py
index ada9c9fb346..46a0ac81d90 100644
--- a/homeassistant/components/iotawatt/coordinator.py
+++ b/homeassistant/components/iotawatt/coordinator.py
@@ -51,6 +51,7 @@ class IotawattUpdater(DataUpdateCoordinator):
                 httpx_client.get_async_client(self.hass),
                 self.entry.data.get(CONF_USERNAME),
                 self.entry.data.get(CONF_PASSWORD),
+                integratedInterval="d",
             )
             try:
                 is_authenticated = await api.connect()
diff --git a/homeassistant/components/iotawatt/sensor.py b/homeassistant/components/iotawatt/sensor.py
index 62f65741566..acc4577fa8a 100644
--- a/homeassistant/components/iotawatt/sensor.py
+++ b/homeassistant/components/iotawatt/sensor.py
@@ -8,6 +8,7 @@ import logging
 from iotawattpy.sensor import Sensor
 
 from homeassistant.components.sensor import (
+    ATTR_LAST_RESET,
     SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
@@ -219,6 +220,9 @@ class IotaWattSensor(update_coordinator.CoordinatorEntity, SensorEntity):
         attrs = {"type": data.getType()}
         if attrs["type"] == "Input":
             attrs["channel"] = data.getChannel()
+        if (begin := data.getBegin()) and (last_reset := dt.parse_datetime(begin)):
+            attrs[ATTR_LAST_RESET] = last_reset.isoformat()
+
         return attrs
 
     @property