> ## Documentation Index
> Fetch the complete documentation index at: https://docs.engrate.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Register

A Register is a concept from the [ENTSO-E Harmonized Electricity Market Role Model](https://www.entsoe.eu/data/cim/role-models/), which defines it as:

> A physical or logical counter measuring energy product.