diff --git a/homeassistant/components/powerfox/config_flow.py b/homeassistant/components/powerfox/config_flow.py
index ca78b8eb874..dd17badf881 100644
--- a/homeassistant/components/powerfox/config_flow.py
+++ b/homeassistant/components/powerfox/config_flow.py
@@ -100,3 +100,36 @@ class PowerfoxConfigFlow(ConfigFlow, domain=DOMAIN):
             data_schema=STEP_REAUTH_SCHEMA,
             errors=errors,
         )
+
+    async def async_step_reconfigure(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Reconfigure Powerfox configuration."""
+        errors = {}
+
+        reconfigure_entry = self._get_reconfigure_entry()
+        if user_input is not None:
+            client = Powerfox(
+                username=user_input[CONF_EMAIL],
+                password=user_input[CONF_PASSWORD],
+                session=async_get_clientsession(self.hass),
+            )
+            try:
+                await client.all_devices()
+            except PowerfoxAuthenticationError:
+                errors["base"] = "invalid_auth"
+            except PowerfoxConnectionError:
+                errors["base"] = "cannot_connect"
+            else:
+                if reconfigure_entry.data[CONF_EMAIL] != user_input[CONF_EMAIL]:
+                    self._async_abort_entries_match(
+                        {CONF_EMAIL: user_input[CONF_EMAIL]}
+                    )
+                return self.async_update_reload_and_abort(
+                    reconfigure_entry, data_updates=user_input
+                )
+        return self.async_show_form(
+            step_id="reconfigure",
+            data_schema=STEP_USER_DATA_SCHEMA,
+            errors=errors,
+        )
diff --git a/homeassistant/components/powerfox/quality_scale.yaml b/homeassistant/components/powerfox/quality_scale.yaml
index 7e104b894ca..f72d25c3684 100644
--- a/homeassistant/components/powerfox/quality_scale.yaml
+++ b/homeassistant/components/powerfox/quality_scale.yaml
@@ -80,7 +80,7 @@ rules:
     status: exempt
     comment: |
       There is no need for icon translations.
-  reconfiguration-flow: todo
+  reconfiguration-flow: done
   repair-issues:
     status: exempt
     comment: |
diff --git a/homeassistant/components/powerfox/strings.json b/homeassistant/components/powerfox/strings.json
index 3eab77494d3..4a7c8e8fa4d 100644
--- a/homeassistant/components/powerfox/strings.json
+++ b/homeassistant/components/powerfox/strings.json
@@ -21,6 +21,18 @@
         "data_description": {
           "password": "[%key:component::powerfox::config::step::user::data_description::password%]"
         }
+      },
+      "reconfigure": {
+        "title": "Reconfigure your Powerfox account",
+        "description": "Powerfox is already configured. Would you like to reconfigure it?",
+        "data": {
+          "email": "[%key:common::config_flow::data::email%]",
+          "password": "[%key:common::config_flow::data::password%]"
+        },
+        "data_description": {
+          "email": "[%key:component::powerfox::config::step::user::data_description::email%]",
+          "password": "[%key:component::powerfox::config::step::user::data_description::password%]"
+        }
       }
     },
     "error": {
@@ -29,7 +41,8 @@
     },
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
-      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]"
+      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]",
+      "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
     }
   },
   "entity": {
diff --git a/tests/components/powerfox/test_config_flow.py b/tests/components/powerfox/test_config_flow.py
index 759092aee6e..a38f316faf3 100644
--- a/tests/components/powerfox/test_config_flow.py
+++ b/tests/components/powerfox/test_config_flow.py
@@ -110,6 +110,32 @@ async def test_duplicate_entry(
     assert result.get("reason") == "already_configured"
 
 
+async def test_duplicate_entry_reconfiguration(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_powerfox_client: AsyncMock,
+) -> None:
+    """Test abort when setting up duplicate entry on reconfiguration."""
+    # Add two config entries
+    mock_config_entry.add_to_hass(hass)
+    mock_config_entry_2 = MockConfigEntry(
+        domain=DOMAIN,
+        data={CONF_EMAIL: "new@powerfox.test", CONF_PASSWORD: "new-password"},
+    )
+    mock_config_entry_2.add_to_hass(hass)
+    assert len(hass.config_entries.async_entries()) == 2
+
+    # Reconfigure the second entry
+    result = await mock_config_entry_2.start_reconfigure_flow(hass)
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={CONF_EMAIL: "test@powerfox.test", CONF_PASSWORD: "test-password"},
+    )
+
+    assert result.get("type") is FlowResultType.ABORT
+    assert result.get("reason") == "already_configured"
+
+
 @pytest.mark.parametrize(
     ("exception", "error"),
     [
@@ -216,3 +242,82 @@ async def test_step_reauth_exceptions(
 
     assert len(hass.config_entries.async_entries()) == 1
     assert mock_config_entry.data[CONF_PASSWORD] == "new-password"
+
+
+async def test_reconfigure(
+    hass: HomeAssistant,
+    mock_powerfox_client: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test reconfiguration of existing entry."""
+    mock_config_entry.add_to_hass(hass)
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result.get("type") is FlowResultType.FORM
+    assert result.get("step_id") == "reconfigure"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={
+            CONF_EMAIL: "new-email@powerfox.test",
+            CONF_PASSWORD: "new-password",
+        },
+    )
+
+    assert result.get("type") is FlowResultType.ABORT
+    assert result.get("reason") == "reconfigure_successful"
+
+    assert len(hass.config_entries.async_entries()) == 1
+    assert mock_config_entry.data[CONF_EMAIL] == "new-email@powerfox.test"
+    assert mock_config_entry.data[CONF_PASSWORD] == "new-password"
+
+
+@pytest.mark.parametrize(
+    ("exception", "error"),
+    [
+        (PowerfoxConnectionError, "cannot_connect"),
+        (PowerfoxAuthenticationError, "invalid_auth"),
+    ],
+)
+async def test_reconfigure_exceptions(
+    hass: HomeAssistant,
+    mock_powerfox_client: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    exception: Exception,
+    error: str,
+) -> None:
+    """Test exceptions during reconfiguration flow."""
+    mock_powerfox_client.all_devices.side_effect = exception
+    mock_config_entry.add_to_hass(hass)
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result.get("type") is FlowResultType.FORM
+    assert result.get("step_id") == "reconfigure"
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={
+            CONF_EMAIL: "new-email@powerfox.test",
+            CONF_PASSWORD: "new-password",
+        },
+    )
+    assert result.get("type") is FlowResultType.FORM
+    assert result.get("errors") == {"base": error}
+
+    # Recover from error
+    mock_powerfox_client.all_devices.side_effect = None
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={
+            CONF_EMAIL: "new-email@powerfox.test",
+            CONF_PASSWORD: "new-password",
+        },
+    )
+
+    assert result.get("type") is FlowResultType.ABORT
+    assert result.get("reason") == "reconfigure_successful"
+
+    assert len(hass.config_entries.async_entries()) == 1
+    assert mock_config_entry.data[CONF_EMAIL] == "new-email@powerfox.test"
+    assert mock_config_entry.data[CONF_PASSWORD] == "new-password"