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+---
+layout: page
+title: "Integration Sensor"
+description: "Instructions on how to integrate Integration Sensor into Home Assistant."
+date: 2019-01-02
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Utility 
+ha_release: 0.87
+ha_iot_class: "Local Push"
+logo: integral.png
+ha_qa_scale: internal
+---
+
+The `integration` platform provides the [Riemann sum](https://en.wikipedia.org/wiki/Riemann_sum) of the values provided by a source sensor. The Riemann sum is an approximation of an **integral** by a finite sum. In this implementation, we follow the Trapezoidal rule.
+
+## {% linkable_title Configuration %}
+
+To enable Integration Sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: integration 
+    source: sensor.current_power
+```
+
+{% configuration %}
+source:
+  description: The entity ID of the sensor providing numeric readings 
+  required: true
+  type: string
+name:
+  description: Name to use in the frontend.
+  required: false
+  default: source entity ID meter
+  type: string
+round:
+  description: Round the calculated integration value to at most N decimal places.
+  required: false
+  default: 3
+  type: integer
+unit_prefix:
+  description: Metric unit to prefix the integration result. Available units are k, M, G, T.
+  required: false
+  default: None
+  type: unit
+unit_time:
+  description: SI unit of time to integrate over. Available units are s, min, h, d.
+  required: false
+  default: h
+  type: unit
+unit:
+  description: Unit of Measurement to be used for the integration.
+  required: false
+  type: string
+{% endconfiguration %}
+
+If 'unit' is set then 'unit_prefix' and 'unit_time' are ignored.
+
+## {% linkable_title Energy %}
+
+An `integration` sensor is quite useful in energy billing scenarios since energy is generally billed in kWh and many sensors provide power in W (Watts).
+
+If you have a sensor that provides you with power readings in Watts (uses W as `unit_of_measurement`), then you can use the `integration` sensor to track how much energy is being spent. Take the next configuration as an example:
+
+```yaml
+sensor:
+  - platform: integration
+    source: sensor.current_power
+    name: energy_spent
+    unit_prefix: k
+    round: 2
+```
+
+This configuration will provide you with `sensor.energy_spent` who will have your energy in kWh.
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