Settlement adjustment due to clock change on 31 March 2019
The clock change this weekend will result in a ‘short’ day which will impact Settlement periods and contract notifications. On a ‘short’ clock change day, there are only 46 Settlement Periods instead of the normal 48.
How it relates to you
UK time changes on Sunday 31 March 2019 from Greenwich Mean Time (GMT)/Coordinated Universal Time (UTC) to British Summer Time (BST) at 01:00 (GMT). This will result in a ‘short’ day as the clocks go forward an hour.
On a ‘short’ clock change day, there are only 46 Settlement Periods instead of the normal 48.
There will be an impact on submitting contract notifications and on ECVAA notification reports.
Submitting a contract notification
Contract notifications for both clock change day and normal days
If you submit a contract notification, which includes the clock change day and normal, non-clock change days, Energy Contract Volume Aggregation Agent (ECVAA) default rules apply.
The notified volumes corresponding to Settlement Periods three and four will be removed on the clock change day. Notified volumes for the remaining Settlement Periods on the clock change day will all be used for the Settlement Period, two Settlement Periods earlier than the one they were originally notified for.
Contract notifications for clock change day
If you submit a contract notification for the clock change day alone, the Settlement Periods in the contract notification should be numbered from 1 to 46.
Please note that contract notifications for the clock change day must contain the correct number of Settlement Periods, as no defaulting rules will be applied to these notifications.
Impact on reports
The ECVAA Notification Report (ECVAA-I014) for 31 March 2019 will only contain 46 Settlement Periods and will include the effect of any defaulting rules applied to multi-day notifications.
The ECVAA Forward Contract Report (ECVAA-I022) for 31 March 2019 will show a representation of the original notifications submitted.