diff --git a/.coveragerc b/.coveragerc
index 9e5044dff64..c012c8e686e 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -903,6 +903,9 @@ omit =
     homeassistant/components/opple/light.py
     homeassistant/components/oru/*
     homeassistant/components/orvibo/switch.py
+    homeassistant/components/osoenergy/__init__.py
+    homeassistant/components/osoenergy/const.py
+    homeassistant/components/osoenergy/water_heater.py
     homeassistant/components/osramlightify/light.py
     homeassistant/components/otp/sensor.py
     homeassistant/components/overkiz/__init__.py
diff --git a/CODEOWNERS b/CODEOWNERS
index e618db415c6..9bcc3daac17 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -930,6 +930,8 @@ build.json @home-assistant/supervisor
 /homeassistant/components/oralb/ @bdraco @Lash-L
 /tests/components/oralb/ @bdraco @Lash-L
 /homeassistant/components/oru/ @bvlaicu
+/homeassistant/components/osoenergy/ @osohotwateriot
+/tests/components/osoenergy/ @osohotwateriot
 /homeassistant/components/otbr/ @home-assistant/core
 /tests/components/otbr/ @home-assistant/core
 /homeassistant/components/ourgroceries/ @OnFreund
diff --git a/homeassistant/components/osoenergy/__init__.py b/homeassistant/components/osoenergy/__init__.py
new file mode 100644
index 00000000000..f0b89eaea90
--- /dev/null
+++ b/homeassistant/components/osoenergy/__init__.py
@@ -0,0 +1,81 @@
+"""Support for the OSO Energy devices and services."""
+from typing import Any, Generic, TypeVar
+
+from aiohttp.web_exceptions import HTTPException
+from apyosoenergyapi import OSOEnergy
+from apyosoenergyapi.helper.const import (
+    OSOEnergyBinarySensorData,
+    OSOEnergySensorData,
+    OSOEnergyWaterHeaterData,
+)
+from apyosoenergyapi.helper.osoenergy_exceptions import OSOEnergyReauthRequired
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_API_KEY, Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import ConfigEntryAuthFailed, ConfigEntryNotReady
+from homeassistant.helpers import aiohttp_client
+from homeassistant.helpers.entity import Entity
+
+from .const import DOMAIN
+
+_T = TypeVar(
+    "_T", OSOEnergyBinarySensorData, OSOEnergySensorData, OSOEnergyWaterHeaterData
+)
+
+PLATFORMS = [
+    Platform.WATER_HEATER,
+]
+PLATFORM_LOOKUP = {
+    Platform.WATER_HEATER: "water_heater",
+}
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Set up OSO Energy from a config entry."""
+    subscription_key = entry.data[CONF_API_KEY]
+    websession = aiohttp_client.async_get_clientsession(hass)
+    osoenergy = OSOEnergy(subscription_key, websession)
+
+    osoenergy_config = dict(entry.data)
+
+    hass.data.setdefault(DOMAIN, {})
+
+    try:
+        devices: Any = await osoenergy.session.start_session(osoenergy_config)
+    except HTTPException as error:
+        raise ConfigEntryNotReady() from error
+    except OSOEnergyReauthRequired as err:
+        raise ConfigEntryAuthFailed from err
+
+    hass.data[DOMAIN][entry.entry_id] = osoenergy
+
+    platforms = set()
+    for ha_type, oso_type in PLATFORM_LOOKUP.items():
+        device_list = devices.get(oso_type, [])
+        if device_list:
+            platforms.add(ha_type)
+    if platforms:
+        await hass.config_entries.async_forward_entry_setups(entry, platforms)
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Unload a config entry."""
+    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+    if unload_ok:
+        hass.data[DOMAIN].pop(entry.entry_id)
+
+    return unload_ok
+
+
+class OSOEnergyEntity(Entity, Generic[_T]):
+    """Initiate OSO Energy Base Class."""
+
+    _attr_has_entity_name = True
+
+    def __init__(self, osoenergy: OSOEnergy, osoenergy_device: _T) -> None:
+        """Initialize the instance."""
+        self.osoenergy = osoenergy
+        self.device = osoenergy_device
+        self._attr_unique_id = osoenergy_device.device_id
diff --git a/homeassistant/components/osoenergy/config_flow.py b/homeassistant/components/osoenergy/config_flow.py
new file mode 100644
index 00000000000..a7632b19bcb
--- /dev/null
+++ b/homeassistant/components/osoenergy/config_flow.py
@@ -0,0 +1,75 @@
+"""Config Flow for OSO Energy."""
+from collections.abc import Mapping
+import logging
+from typing import Any
+
+from apyosoenergyapi import OSOEnergy
+import voluptuous as vol
+
+from homeassistant import config_entries
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_API_KEY
+from homeassistant.data_entry_flow import FlowResult
+from homeassistant.helpers import aiohttp_client
+
+from .const import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+_SCHEMA_STEP_USER = vol.Schema({vol.Required(CONF_API_KEY): str})
+
+
+class OSOEnergyFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
+    """Handle a OSO Energy config flow."""
+
+    VERSION = 1
+    CONNECTION_CLASS = config_entries.CONN_CLASS_CLOUD_POLL
+
+    def __init__(self) -> None:
+        """Initialize."""
+        self.entry: ConfigEntry | None = None
+
+    async def async_step_user(self, user_input=None) -> FlowResult:
+        """Handle a flow initialized by the user."""
+        errors = {}
+
+        if user_input is not None:
+            # Verify Subscription key
+            if user_email := await self.get_user_email(user_input[CONF_API_KEY]):
+                await self.async_set_unique_id(user_email)
+
+                if (
+                    self.context["source"] == config_entries.SOURCE_REAUTH
+                    and self.entry
+                ):
+                    self.hass.config_entries.async_update_entry(
+                        self.entry, title=user_email, data=user_input
+                    )
+                    await self.hass.config_entries.async_reload(self.entry.entry_id)
+                    return self.async_abort(reason="reauth_successful")
+
+                self._abort_if_unique_id_configured()
+                return self.async_create_entry(title=user_email, data=user_input)
+
+            errors["base"] = "invalid_auth"
+
+        return self.async_show_form(
+            step_id="user",
+            data_schema=_SCHEMA_STEP_USER,
+            errors=errors,
+        )
+
+    async def get_user_email(self, subscription_key: str) -> str | None:
+        """Return the user email for the provided subscription key."""
+        try:
+            websession = aiohttp_client.async_get_clientsession(self.hass)
+            client = OSOEnergy(subscription_key, websession)
+            return await client.get_user_email()
+        except Exception:  # pylint: disable=broad-except
+            _LOGGER.exception("Unknown error occurred")
+        return None
+
+    async def async_step_reauth(self, user_input: Mapping[str, Any]) -> FlowResult:
+        """Re Authenticate a user."""
+        self.entry = self.hass.config_entries.async_get_entry(self.context["entry_id"])
+        data = {CONF_API_KEY: user_input[CONF_API_KEY]}
+        return await self.async_step_user(data)
diff --git a/homeassistant/components/osoenergy/const.py b/homeassistant/components/osoenergy/const.py
new file mode 100644
index 00000000000..c3925f5259b
--- /dev/null
+++ b/homeassistant/components/osoenergy/const.py
@@ -0,0 +1,3 @@
+"""Constants for OSO Energy."""
+
+DOMAIN = "osoenergy"
diff --git a/homeassistant/components/osoenergy/manifest.json b/homeassistant/components/osoenergy/manifest.json
new file mode 100644
index 00000000000..d6813108242
--- /dev/null
+++ b/homeassistant/components/osoenergy/manifest.json
@@ -0,0 +1,9 @@
+{
+  "domain": "osoenergy",
+  "name": "OSO Energy",
+  "codeowners": ["@osohotwateriot"],
+  "config_flow": true,
+  "documentation": "https://www.home-assistant.io/integrations/osoenergy",
+  "iot_class": "cloud_polling",
+  "requirements": ["pyosoenergyapi==1.1.3"]
+}
diff --git a/homeassistant/components/osoenergy/strings.json b/homeassistant/components/osoenergy/strings.json
new file mode 100644
index 00000000000..a45482bf030
--- /dev/null
+++ b/homeassistant/components/osoenergy/strings.json
@@ -0,0 +1,29 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "title": "OSO Energy Auth",
+        "description": "Enter the generated 'Subscription Key' for your account at 'https://portal.osoenergy.no/'",
+        "data": {
+          "api_key": "[%key:common::config_flow::data::api_key%]"
+        }
+      },
+      "reauth": {
+        "title": "OSO Energy Auth",
+        "description": "Generate and enter a new 'Subscription Key' for your account at 'https://portal.osoenergy.no/'.",
+        "data": {
+          "api_key": "[%key:common::config_flow::data::api_key%]"
+        }
+      }
+    },
+    "error": {
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
+      "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]",
+      "unknown": "[%key:common::config_flow::error::unknown%]"
+    },
+    "abort": {
+      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]",
+      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]"
+    }
+  }
+}
diff --git a/homeassistant/components/osoenergy/water_heater.py b/homeassistant/components/osoenergy/water_heater.py
new file mode 100644
index 00000000000..4b2ad7c48d6
--- /dev/null
+++ b/homeassistant/components/osoenergy/water_heater.py
@@ -0,0 +1,142 @@
+"""Support for OSO Energy water heaters."""
+from typing import Any
+
+from apyosoenergyapi.helper.const import OSOEnergyWaterHeaterData
+
+from homeassistant.components.water_heater import (
+    STATE_ECO,
+    STATE_ELECTRIC,
+    STATE_HIGH_DEMAND,
+    STATE_OFF,
+    WaterHeaterEntity,
+    WaterHeaterEntityFeature,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import UnitOfTemperature
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import OSOEnergyEntity
+from .const import DOMAIN
+
+CURRENT_OPERATION_MAP: dict[str, Any] = {
+    "default": {
+        "off": STATE_OFF,
+        "powersave": STATE_OFF,
+        "extraenergy": STATE_HIGH_DEMAND,
+    },
+    "oso": {
+        "auto": STATE_ECO,
+        "off": STATE_OFF,
+        "powersave": STATE_OFF,
+        "extraenergy": STATE_HIGH_DEMAND,
+    },
+}
+HEATER_MIN_TEMP = 10
+HEATER_MAX_TEMP = 80
+MANUFACTURER = "OSO Energy"
+
+
+async def async_setup_entry(
+    hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
+) -> None:
+    """Set up OSO Energy heater based on a config entry."""
+    osoenergy = hass.data[DOMAIN][entry.entry_id]
+    devices = osoenergy.session.device_list.get("water_heater")
+    entities = []
+    if devices:
+        for dev in devices:
+            entities.append(OSOEnergyWaterHeater(osoenergy, dev))
+    async_add_entities(entities, True)
+
+
+class OSOEnergyWaterHeater(
+    OSOEnergyEntity[OSOEnergyWaterHeaterData], WaterHeaterEntity
+):
+    """OSO Energy Water Heater Device."""
+
+    _attr_name = None
+    _attr_supported_features = WaterHeaterEntityFeature.TARGET_TEMPERATURE
+    _attr_temperature_unit = UnitOfTemperature.CELSIUS
+
+    @property
+    def device_info(self) -> DeviceInfo:
+        """Return device information."""
+        return DeviceInfo(
+            identifiers={(DOMAIN, self.device.device_id)},
+            manufacturer=MANUFACTURER,
+            model=self.device.device_type,
+            name=self.device.device_name,
+        )
+
+    @property
+    def available(self) -> bool:
+        """Return if the device is available."""
+        return self.device.available
+
+    @property
+    def current_operation(self) -> str:
+        """Return current operation."""
+        status = self.device.current_operation
+        if status == "off":
+            return STATE_OFF
+
+        optimization_mode = self.device.optimization_mode.lower()
+        heater_mode = self.device.heater_mode.lower()
+        if optimization_mode in CURRENT_OPERATION_MAP:
+            return CURRENT_OPERATION_MAP[optimization_mode].get(
+                heater_mode, STATE_ELECTRIC
+            )
+
+        return CURRENT_OPERATION_MAP["default"].get(heater_mode, STATE_ELECTRIC)
+
+    @property
+    def current_temperature(self) -> float:
+        """Return the current temperature of the heater."""
+        return self.device.current_temperature
+
+    @property
+    def target_temperature(self) -> float:
+        """Return the temperature we try to reach."""
+        return self.device.target_temperature
+
+    @property
+    def target_temperature_high(self) -> float:
+        """Return the temperature we try to reach."""
+        return self.device.target_temperature_high
+
+    @property
+    def target_temperature_low(self) -> float:
+        """Return the temperature we try to reach."""
+        return self.device.target_temperature_low
+
+    @property
+    def min_temp(self) -> float:
+        """Return the minimum temperature."""
+        return self.device.min_temperature
+
+    @property
+    def max_temp(self) -> float:
+        """Return the maximum temperature."""
+        return self.device.max_temperature
+
+    async def async_turn_on(self, **kwargs) -> None:
+        """Turn on hotwater."""
+        await self.osoenergy.hotwater.turn_on(self.device, True)
+
+    async def async_turn_off(self, **kwargs) -> None:
+        """Turn off hotwater."""
+        await self.osoenergy.hotwater.turn_off(self.device, True)
+
+    async def async_set_temperature(self, **kwargs: Any) -> None:
+        """Set new target temperature."""
+        target_temperature = int(kwargs.get("temperature", self.target_temperature))
+        profile = [target_temperature] * 24
+
+        await self.osoenergy.hotwater.set_profile(self.device, profile)
+
+    async def async_update(self) -> None:
+        """Update all Node data from Hive."""
+        await self.osoenergy.session.update_data()
+        self.device = await self.osoenergy.hotwater.get_water_heater(self.device)
diff --git a/homeassistant/generated/config_flows.py b/homeassistant/generated/config_flows.py
index aa13faaf501..6315d2db46e 100644
--- a/homeassistant/generated/config_flows.py
+++ b/homeassistant/generated/config_flows.py
@@ -348,6 +348,7 @@ FLOWS = {
         "openweathermap",
         "opower",
         "oralb",
+        "osoenergy",
         "otbr",
         "ourgroceries",
         "overkiz",
diff --git a/homeassistant/generated/integrations.json b/homeassistant/generated/integrations.json
index 36aae4f799b..652fc11411e 100644
--- a/homeassistant/generated/integrations.json
+++ b/homeassistant/generated/integrations.json
@@ -4150,6 +4150,12 @@
       "config_flow": false,
       "iot_class": "local_push"
     },
+    "osoenergy": {
+      "name": "OSO Energy",
+      "integration_type": "hub",
+      "config_flow": true,
+      "iot_class": "cloud_polling"
+    },
     "osramlightify": {
       "name": "Osramlightify",
       "integration_type": "hub",
diff --git a/requirements_all.txt b/requirements_all.txt
index 935f5f78075..77fe9c3801a 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1955,6 +1955,9 @@ pyopnsense==0.4.0
 # homeassistant.components.opple
 pyoppleio-legacy==1.0.8
 
+# homeassistant.components.osoenergy
+pyosoenergyapi==1.1.3
+
 # homeassistant.components.opentherm_gw
 pyotgw==2.1.3
 
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 741b40b5ee4..cdc63c097f7 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1478,6 +1478,9 @@ pyopenuv==2023.02.0
 # homeassistant.components.opnsense
 pyopnsense==0.4.0
 
+# homeassistant.components.osoenergy
+pyosoenergyapi==1.1.3
+
 # homeassistant.components.opentherm_gw
 pyotgw==2.1.3
 
diff --git a/tests/components/osoenergy/__init__.py b/tests/components/osoenergy/__init__.py
new file mode 100644
index 00000000000..76d134ef0f5
--- /dev/null
+++ b/tests/components/osoenergy/__init__.py
@@ -0,0 +1 @@
+"""Tests for the OSO Hotwater integration."""
diff --git a/tests/components/osoenergy/test_config_flow.py b/tests/components/osoenergy/test_config_flow.py
new file mode 100644
index 00000000000..d7250356ebe
--- /dev/null
+++ b/tests/components/osoenergy/test_config_flow.py
@@ -0,0 +1,164 @@
+"""Test the OSO Energy config flow."""
+from unittest.mock import patch
+
+from apyosoenergyapi.helper import osoenergy_exceptions
+
+from homeassistant import config_entries, data_entry_flow
+from homeassistant.components.osoenergy.const import DOMAIN
+from homeassistant.const import CONF_API_KEY
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+SUBSCRIPTION_KEY = "valid subscription key"
+SCAN_INTERVAL = 120
+TEST_USER_EMAIL = "test_user_email@domain.com"
+UPDATED_SCAN_INTERVAL = 60
+
+
+async def test_user_flow(hass: HomeAssistant) -> None:
+    """Test the user flow."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result["errors"] == {}
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        return_value=TEST_USER_EMAIL,
+    ), patch(
+        "homeassistant.components.osoenergy.async_setup_entry", return_value=True
+    ) as mock_setup_entry:
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {CONF_API_KEY: SUBSCRIPTION_KEY},
+        )
+        await hass.async_block_till_done()
+
+    assert result2["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY
+    assert result2["title"] == TEST_USER_EMAIL
+    assert result2["data"] == {
+        CONF_API_KEY: SUBSCRIPTION_KEY,
+    }
+
+    assert len(mock_setup_entry.mock_calls) == 1
+    assert len(hass.config_entries.async_entries(DOMAIN)) == 1
+
+
+async def test_reauth_flow(hass: HomeAssistant) -> None:
+    """Test the reauth flow."""
+    mock_config = MockConfigEntry(
+        domain=DOMAIN,
+        unique_id=TEST_USER_EMAIL,
+        data={CONF_API_KEY: SUBSCRIPTION_KEY},
+    )
+    mock_config.add_to_hass(hass)
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        return_value=None,
+    ):
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={
+                "source": config_entries.SOURCE_REAUTH,
+                "unique_id": mock_config.unique_id,
+                "entry_id": mock_config.entry_id,
+            },
+            data=mock_config.data,
+        )
+
+    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result["errors"] == {"base": "invalid_auth"}
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        return_value=TEST_USER_EMAIL,
+    ):
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {
+                CONF_API_KEY: SUBSCRIPTION_KEY,
+            },
+        )
+    await hass.async_block_till_done()
+
+    assert mock_config.data.get(CONF_API_KEY) == SUBSCRIPTION_KEY
+    assert result2["type"] == data_entry_flow.RESULT_TYPE_ABORT
+    assert result2["reason"] == "reauth_successful"
+    assert len(hass.config_entries.async_entries(DOMAIN)) == 1
+
+
+async def test_abort_if_existing_entry(hass: HomeAssistant) -> None:
+    """Check flow abort when an entry already exist."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        unique_id=TEST_USER_EMAIL,
+        data={CONF_API_KEY: SUBSCRIPTION_KEY},
+    )
+    config_entry.add_to_hass(hass)
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        return_value=TEST_USER_EMAIL,
+    ):
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={"source": config_entries.SOURCE_USER},
+            data={
+                CONF_API_KEY: SUBSCRIPTION_KEY,
+            },
+        )
+
+    assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
+    assert result["reason"] == "already_configured"
+
+
+async def test_user_flow_invalid_subscription_key(hass: HomeAssistant) -> None:
+    """Test user flow with invalid username."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result["errors"] == {}
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        return_value=None,
+    ):
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {CONF_API_KEY: SUBSCRIPTION_KEY},
+        )
+
+    assert result2["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result2["step_id"] == "user"
+    assert result2["errors"] == {"base": "invalid_auth"}
+
+
+async def test_user_flow_exception_on_subscription_key_check(
+    hass: HomeAssistant,
+) -> None:
+    """Test user flow with invalid username."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result["errors"] == {}
+
+    with patch(
+        "homeassistant.components.osoenergy.config_flow.OSOEnergy.get_user_email",
+        side_effect=osoenergy_exceptions.OSOEnergyReauthRequired(),
+    ):
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {CONF_API_KEY: SUBSCRIPTION_KEY},
+        )
+
+    assert result2["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result2["step_id"] == "user"
+    assert result2["errors"] == {"base": "invalid_auth"}