---
title: "Loss of load probability and de-rated margin (LOLPDRM)"
method: GET
path: "/datasets/LOLPDRM"
tags: ["BMRS Datasets"]
---

# Loss of load probability and de-rated margin (LOLPDRM)

`GET /datasets/LOLPDRM`

The loss of load probability and de-rated margin data is received half-hourly from NGESO.
            
Loss of load probability (LoLP) is a measure of system reliability, calculated by NGESO for each settlement period,
using the methodology set out in the Loss of Load Probability Calculation Statement.
            
De-rated margin is a forecast of the excess supply on the system, which has been adjusted to take account of the likely availability of electricity generators.

## Query parameters

- `publishDateTimeFrom` string, date-time, required
- `publishDateTimeTo` string, date-time, required
- `format` 'json' | 'xml' | 'csv'

## Response `200`

Data retrieved

- InsightsApiModelsResponsesDatasetResponse1InsightsApiModelsResponsesMiscDatasetRowsLossOfLoadProbabilityDeratedMarginData
  - `data` InsightsApiModelsResponsesMiscDatasetRowsLossOfLoadProbabilityDeratedMarginData[], nullable
    - `dataset` string, nullable
    - `publishTime` string, date-time
    - `publishingPeriodCommencingTime` string, date-time
    - `startTime` string, date-time
    - `settlementDate` string, date
    - `settlementPeriod` integer
    - `lossOfLoadProbability` number, double, nullable
    - `deratedMargin` number, double, nullable

## Other responses

- `400` — Error with query parameters - see response for details
- `429` — Too many requests
- `500` — Server error - please try again later

---

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