diff --git a/homeassistant/components/ovo_energy/config_flow.py b/homeassistant/components/ovo_energy/config_flow.py
index e4d33865f57..ac3e8371123 100644
--- a/homeassistant/components/ovo_energy/config_flow.py
+++ b/homeassistant/components/ovo_energy/config_flow.py
@@ -9,58 +9,48 @@ from homeassistant import config_entries
 from homeassistant.config_entries import ConfigFlow
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 
-from .const import CONF_ACCOUNT_ID, DOMAIN
+from .const import CONF_ACCOUNT_ID, DOMAIN  # pylint: disable=unused-import
 
 _LOGGER = logging.getLogger(__name__)
 
+USER_SCHEMA = vol.Schema(
+    {vol.Required(CONF_USERNAME): str, vol.Required(CONF_PASSWORD): str}
+)
 
-@config_entries.HANDLERS.register(DOMAIN)
-class OVOEnergyFlowHandler(ConfigFlow):
+
+class OVOEnergyFlowHandler(ConfigFlow, domain=DOMAIN):
     """Handle a OVO Energy config flow."""
 
     VERSION = 1
     CONNECTION_CLASS = config_entries.CONN_CLASS_CLOUD_POLL
 
-    def __init__(self):
-        """Initialize OVO Energy flow."""
-
-    async def _show_setup_form(self, errors=None):
-        """Show the setup form to the user."""
-        return self.async_show_form(
-            step_id="user",
-            data_schema=vol.Schema(
-                {vol.Required(CONF_USERNAME): str, vol.Required(CONF_PASSWORD): str}
-            ),
-            errors=errors or {},
-        )
-
     async def async_step_user(self, user_input=None):
         """Handle a flow initiated by the user."""
-        if user_input is None:
-            return await self._show_setup_form()
-
         errors = {}
-
-        client = OVOEnergy()
-
-        try:
-            if (
-                await client.authenticate(
-                    user_input.get(CONF_USERNAME), user_input.get(CONF_PASSWORD)
+        if user_input is not None:
+            client = OVOEnergy()
+            try:
+                authenticated = await client.authenticate(
+                    user_input[CONF_USERNAME], user_input[CONF_PASSWORD]
                 )
-                is not True
-            ):
-                errors["base"] = "authorization_error"
-                return await self._show_setup_form(errors)
-        except aiohttp.ClientError:
-            errors["base"] = "connection_error"
-            return await self._show_setup_form(errors)
+            except aiohttp.ClientError:
+                errors["base"] = "connection_error"
+            else:
+                if authenticated:
+                    await self.async_set_unique_id(user_input[CONF_USERNAME])
+                    self._abort_if_unique_id_configured()
 
-        return self.async_create_entry(
-            title=client.account_id,
-            data={
-                CONF_USERNAME: user_input.get(CONF_USERNAME),
-                CONF_PASSWORD: user_input.get(CONF_PASSWORD),
-                CONF_ACCOUNT_ID: client.account_id,
-            },
+                    return self.async_create_entry(
+                        title=client.account_id,
+                        data={
+                            CONF_USERNAME: user_input[CONF_USERNAME],
+                            CONF_PASSWORD: user_input[CONF_PASSWORD],
+                            CONF_ACCOUNT_ID: client.account_id,
+                        },
+                    )
+
+                errors["base"] = "authorization_error"
+
+        return self.async_show_form(
+            step_id="user", data_schema=USER_SCHEMA, errors=errors
         )
diff --git a/homeassistant/components/ovo_energy/manifest.json b/homeassistant/components/ovo_energy/manifest.json
index 27a28863405..2da08d3339b 100644
--- a/homeassistant/components/ovo_energy/manifest.json
+++ b/homeassistant/components/ovo_energy/manifest.json
@@ -4,6 +4,5 @@
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/ovo_energy",
   "requirements": ["ovoenergy==1.1.6"],
-  "dependencies": [],
   "codeowners": ["@timmo001"]
 }
diff --git a/homeassistant/components/ovo_energy/strings.json b/homeassistant/components/ovo_energy/strings.json
index a98b0223644..0132f3582b6 100644
--- a/homeassistant/components/ovo_energy/strings.json
+++ b/homeassistant/components/ovo_energy/strings.json
@@ -1,18 +1,19 @@
 {
-  "config": {
-    "error": {
-      "authorization_error": "Authorization error. Check your credentials.",
-      "connection_error": "Could not connect to OVO Energy."
-    },
-    "step": {
-      "user": {
-        "data": {
-          "username": "[%key:common::config_flow::data::username%]",
-          "password": "[%key:common::config_flow::data::password%]"
+    "config": {
+        "error": {
+            "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
+            "authorization_error": "Authorization error. Check your credentials.",
+            "connection_error": "[%key:common::config_flow::error::cannot_connect%]"
         },
-        "description": "Set up an OVO Energy instance to access your energy usage.",
-        "title": "Add OVO Energy"
-      }
+        "step": {
+            "user": {
+                "data": {
+                    "username": "[%key:common::config_flow::data::username%]",
+                    "password": "[%key:common::config_flow::data::password%]"
+                },
+                "description": "Set up an OVO Energy instance to access your energy usage.",
+                "title": "Add OVO Energy Account"
+            }
+        }
     }
-  }
 }
diff --git a/homeassistant/components/ovo_energy/translations/en.json b/homeassistant/components/ovo_energy/translations/en.json
index 64a3bfe80c3..0132f3582b6 100644
--- a/homeassistant/components/ovo_energy/translations/en.json
+++ b/homeassistant/components/ovo_energy/translations/en.json
@@ -1,18 +1,19 @@
 {
     "config": {
         "error": {
+            "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
             "authorization_error": "Authorization error. Check your credentials.",
-            "connection_error": "Could not connect to OVO Energy."
+            "connection_error": "[%key:common::config_flow::error::cannot_connect%]"
         },
         "step": {
             "user": {
                 "data": {
-                    "password": "Password",
-                    "username": "Username"
+                    "username": "[%key:common::config_flow::data::username%]",
+                    "password": "[%key:common::config_flow::data::password%]"
                 },
                 "description": "Set up an OVO Energy instance to access your energy usage.",
-                "title": "Add OVO Energy"
+                "title": "Add OVO Energy Account"
             }
         }
     }
-}
\ No newline at end of file
+}