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Bid/Offer Volume Heatmap

About

The Bid/Offer Volumes Heatmap shows the magnitude of the bids/offers as a percentage of installed capacity in the market over time across the market, with this able to be filtered as required.

A 'T' in the cell indicates a system action. Each cell as an embedded link that can be used to see activity at a particular unit in more detail.

By examining the heatmap for both accepted or declared bids and offers it is possible to see which units are being bid on and off at any particular time and the user can also see the net bid/offer volume position to compare levels of bids and offers on the same chart to compare levels of both bids and offers at the same time.

Where the unit is unavailable throughout a whole period (or block) this has been denoted by a greyed cell to highlight where activity is not occurring because a unit is offline.

In this heatmap bid volumes are denoted by red cells and offer volumes by blue cells.

Included Data

The data on this heatmap is the Accepted (or Declared) Bid/Offer Volume data, which represents the volume of actions taken (or available to be taken) by National Grid to reduce/increase generation via the Balancing Mechanism within gate-closure.

Colours Guide

The following details the colours used in this chart:

Styling (Bids) Description (Bids) Styling (Offers) Description (Offers)
Unavailable Unit
No Balancing Activity
0-10% 0-10%
10-20% 10-20%
20-30% 20-30%
30-40% 30-40%
40-50% 40-50%
50-60% 50-60%
60-70% 60-70%
70-80% 70-80%
80-90% 80-90%
90-100% 90-100%

Data Service

The Bid/Offer Volumes Heatmap data can be extracted from the API to get the volumes of Balancing Mechanism activity as a percentage of installed capacity over the market. This is not as detailed as other sources, but gives the same overview given in the front end chart. The parameters used as follows:

Code Required/Optional Description
chart Required bovolhm
startdatetime Required The start date time in format YYYYMMDDHHMMSS.
enddatetime Required The end date time in format YYYYMMDDHHMMSS.
resolution Required The type of resolution. (See 'resolutions' action, e.g. hh)
filter Optional The group of units that are of interest e.g. filter=fuel&fuel=coal. This defaults to filter=none&none=null and is as in the browser URL when picking options in the chart normally.
accdecl Optional Whether to go accepted (0) or declared (1) and is as in the browser URL when picking options in the chart normally. Defaults to accdecl=0 (Accepted)
bidoffer Optional Whether to look at Bids (bid) or Offers (offer) and is as in the browser URL when picking options in the chart normally. Defaults to bidoffer=offer (Offers)
format Required The type of format. The value could be xml or csv . (See 'formats' action)

Examples :

https://enbm.netareports.com/dataService?username=xxx&password=xxx&format=xml&action=data&chart=bovolhm&startdatetime=20190213000000&enddatetime=20190214000000&resolution=hh&filter=none&none=null&accdecl=0&bidoffer=offer