System Margin Summary
About
The System Margin Summary chart shows levels of available
margin by fuel or by declared offer price, indicating the amount of
spare capacity in the system with an indication of how expensive
this margin might become shown by the fuel types available.
Included Data
This is calculate by the amount of MEL available at units
beyond their generation levels and it should be noted that ramp
rates and other dynamic parameters may prevent much of this margin
from being available in the short term.
Clicking on the chart will open a box showing levels of
margin by unit ranked by price alongside the size of the possible
generation increases and their planned generation. Once this box is
opened it is possible to click through from here to see the unit's
charts.
The System Margin Summary is a chart that can be used to show
the overall levels of margin in the market and the overall levels
of margin at Already Online Generators. Where this margin at
Already Online Generators gets low (normally at around 1GW),
National Grid tends to bring on another plant from the slower
responding section of the Offer On Table.
By setting the Grouping Filter, the margin is broken up based
upon the prices submitted for price increases showing how much
capacity National Grid can secure at different price bands.
This is a chart where the 'SEE HISTORY' button in the top
left can be useful to look further back in time to see how these
price bands have moved. Generators will often move their prices the
day before a tight day and so any increases in the dark red zone
show where generators are looking to maximise their revenue
opportunities in the market. The back button will return a user to
this chart after pressing 'SEE HISTORY'.
Data Service
The data for the System Margin Summary chart can be extracted from the API. The parameters are as follows:
| Code |
Required/Optional |
Description |
| chart |
Required |
systemmarginoverall |
| update |
Optional |
If false will always return data, else will return no
data message if no change since submitted time |
| gmtupdatetime |
Required if update=true |
If update=true must put in the time of the last update.
Can use the top field timestamp="2018-06-20T08:46:51" to get the
last check time and then this feature can be used to only get
data when a change has occurred. |
| format |
Required |
The type of format. The value could be xml or csv. (See 'formats' action)
|
| series_to_plot |
Optional |
The type of aggregation to use, e.g. fuel or offerprice
(see chart URL for more types). Defaults to fuel if missing. |
| spinningreserve |
Optional |
Whether spinning reserve only (1) or not (0). Defaults to
0 (all margin). |
|
Example :
enprompt.netareports.com/dataService?username=xxx&password=yyy&format=xml&action=data&chart=systemmarginoverall&update=false&series_to_plot=offerprice&spinningreserve=1
|
|