> ## 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.

# Control Energy Price

Control energy prices (reBAP — regelzonenübergreifender einheitlicher Bilanzausgleichsenergiepreis) are the prices used to value imbalance energy in MaBiS settlement. They are published by the TSOs and received via PRICAT EDIFACT messages.

## Structure

Each response contains the prices for one TSO area and one month:

* **tso** — the TSO control area identifier
* **month** — the settlement month (`YYYY-MM`)
* **data** — an array of quarter-hourly price data points, each with a timestamp and price in EUR/MWh

## Usage

Control energy prices are used in two ways:

1. **Imbalance cost calculation** — each quarter-hourly imbalance (actual minus scheduled energy) is multiplied by the corresponding reBAP price to determine the financial impact
2. **Monthly cost summaries** — the `GET /mabis/energy-volumes/{mabis_zp_id}/monthly-summary` endpoint uses these prices to compute cost breakdowns per aggregation object

## Data availability

Prices are available once the TSO publishes them via PRICAT messages. For the preliminary billing phase (M+18 WT), provisional prices may be used. Final prices are typically available before the final billing deadline (M+42 WT).