diff --git a/custom_components/carbon_intensity/binary_sensor.py b/custom_components/carbon_intensity/binary_sensor.py
index 8020fcf..ffebb46 100644
--- a/custom_components/carbon_intensity/binary_sensor.py
+++ b/custom_components/carbon_intensity/binary_sensor.py
@@ -1,16 +1,17 @@
 from datetime import timedelta
 import logging
-from .target_rates.target_rate import CarbonIntensityTargetRate
 
+import voluptuous as vol
+
+from homeassistant.helpers import config_validation as cv, entity_platform
 from homeassistant.exceptions import ConfigEntryNotReady
 
 from .const import (
   DOMAIN,
-
   CONFIG_TARGET_NAME,
-
   DATA_RATES_COORDINATOR
 )
+from .target_rates.target_rate import CarbonIntensityTargetRate
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -35,4 +36,25 @@ async def async_setup_target_sensors(hass, entry, async_add_entities):
   
   coordinator = hass.data[DOMAIN][DATA_RATES_COORDINATOR]
 
-  async_add_entities([CarbonIntensityTargetRate(coordinator, config)], True)
+  platform = entity_platform.async_get_current_platform()
+  platform.async_register_entity_service(
+    "update_target_config",
+    vol.All(
+      vol.Schema(
+        {
+          vol.Optional("target_hours"): str,
+          vol.Optional("target_start_time"): str,
+          vol.Optional("target_end_time"): str,
+          vol.Optional("target_offset"): str,
+          vol.Optional("target_maximum_rate"): str,
+        },
+        extra=vol.ALLOW_EXTRA,
+      ),
+      cv.has_at_least_one_key(
+        "target_hours", "target_start_time", "target_end_time", "target_offset", "target_maximum_rate"
+      ),
+    ),
+    "async_update_config",
+  )
+
+  async_add_entities([CarbonIntensityTargetRate(hass, coordinator, config)], True)