Duke Energy Documentation (#34631)

* Duke Energy Documentation

* Style tweaks, add config flow and prereqs

* fix markdown

* tiny tweak

* Update source/_integrations/duke_energy.markdown

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Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_integrations/duke_energy.markdown

@@ -0,0 +1,39 @@
+---
+title: Duke Energy
+description: Instructions on how to integrate Duke Energy within Home Assistant.
+ha_category:
+  - Energy
+ha_release: 2024.10
+ha_iot_class: Cloud Polling
+ha_codeowners:
+  - '@hunterjm'
+ha_domain: duke_energy
+ha_config_flow: true
+ha_integration_type: integration
+---
+
+The **Duke Energy** {% term integration %} allows you to get energy information from [Duke Energy](https://www.duke-energy.com/).
+
+## Supported devices
+
+Currently, this integration only supports electric meters.
+
+## Prerequisites
+
+You need a Duke Energy account to use this integration. During installation of the integration, you will need the username and password to access your account.
+
+{% include integrations/config_flow.md %}
+
+## Energy
+
+Because Duke Energy only releases usage data with around a 48-hour delay, the integration inserts data into statistic objects.
+You can find the statistics in {% my developer_statistics title="**Developer Tools** > **Statistics**"%} and search for "duke_energy".
+**This delay means that there will be no data in the energy dashboard for today and likely yesterday** (depending on time of day you are checking).
+
+At the initial setup, the integration pulls historical hourly usage since the account activation. Duke Energy typically only keeps this data for the past 3 years.
+After the initial setup, the integration keeps pulling data (twice per day) for the past 30 days to allow for any corrections in the data.
+
+In the configuration of the energy dashboard ({% my config_energy title="**Settings** > **Dashboards** > **Energy**" %}):
+
+1. Select **Add consumption** for the **Electricity grid**.
+2. Select **Duke Energy Electric {meter serial number} Consumption** for the **consumed energy**.