---
title: "Clean Horizon Storage Index - Delivered by Nord Pool"
method: GET
path: "/api/v2/CleanHorizonStorageIndex/Monthly/ByAreas"
tags: ["PowerSystem"]
---

# Clean Horizon Storage Index - Delivered by Nord Pool

`GET /api/v2/CleanHorizonStorageIndex/Monthly/ByAreas`

Returns a list of monthly gross revenues of storage assets for a list of areas.

Monthly storage index provides information on how much money could a 1, 2, and 4-hour storage asset have earned in a given month.
Values are calculated based on premium indexes by summing up daily total revenues for the month.  

### Response field descriptions
- **area**: biding zone the index is calculated for
- **status**: Missing if no data found for the area. Available if data is present
- **unit**: currency unit of the index values, always **EUR/MW/Month**
- **updatedAt**: date and time when the index values were last updated
- **markets**: list of markets (revenue streams) the index is considered for
- **indexValues**: list of monthly index values for a 1, 2, and 4-hour storage asset
  - **utcMonth**: month for which the index values are calculated
  - **index1h**: 1 hour storage index value in EUR/MW/Month
  - **index2h**: 2 hour storage index value in EUR/MW/Month
  - **index4h**: 4 hour storage index value in EUR/MW/Month
            
More details about storage index can be found in the [Clean Horizon Storage Index](https://www.cleanhorizon.com/battery-index/).

## Query parameters

- `areas` string, required

## Response `200`

OK

- ApiFreeStorageIndex[]
  - `area` string, nullable
  - `unit` string, nullable
  - `updatedAt` string, date-time
  - `markets` StorageIndexRevenueMarket[], nullable
  - `indexValues` FreeStorageIndexValue[], nullable
    - `utcMonth` string, date
    - `index1h` number, double
    - `index2h` number, double
    - `index4h` number, double
  - `status` 'Missing' | 'Available'

## Other responses

- `400` — Bad Request
- `401` — Unauthorized
- `403` — Forbidden

---

[API](https://skmtc.dev/nordpoolgroup/apis/auction-member-test.md) · [All operations](https://skmtc.dev/nordpoolgroup/apis/auction-member-test/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/nordpoolgroup/auction-member-test/revisions/6a21504d677e/schema)