# Engie

> Supported steering: batteries, PV, imbalance market

Source: https://voltmasters.io/en/docs/external-signal/engie/

[Engie](https://www.engie.com) is an energy supplier. Within the EMS, Engie operates the connected assets through the **Companion** flexibility platform (the same platform used by BEE). The controller communicates with the Companion **REST API** over HTTPS.

**Supported steering:** batteries, PV, imbalance market.

### Connection method

-   **Protocol:** HTTPS REST API
-   **Endpoint:** `https://api.companion.energy/v2`

### What we need to connect

To enable the Engie (Companion) integration, the following must be provided and configured in the project's energy trading settings:

| Credential | Description |
| --- | --- |
| **API key** | Authenticates the controller to the Companion API |
| **Customer ID** | Identifies the customer / site within Companion |
| **PV asset ID** | Optional, one per PV inverter the EMS does not steer |

A PV inverter the EMS steers registers itself with Companion through the controller, so it needs no asset ID. An inverter that is not set to controllable cannot do that, so Companion assigns it an ID and you enter that ID in the project's external control settings.

See [PV asset IDs](https://voltmasters.io/en/docs/voltmasters-platform/project-settings/external-control/#pv-asset-ids-bee-and-engie) for how the mapping is entered, and [Changing a connected configuration](https://voltmasters.io/en/docs/voltmasters-platform/project-settings/external-control/#changing-a-connected-configuration) for correcting a credential or an asset ID later on.