New ETLMO values for BSC Year 2021/22 published
The revised Estimated Transmission Losses Adjustment (ETLMO) values for use from 1 April 2021 have been approved. The approval was made by the Imbalance Settlement Group at its January meeting.
Confirmed ETLMO dates and values
The table below lists the effective from and to dates and the new Delivering (ETLMOj+) and Offtaking (ETLMOj-) values for that period.
| Date effective from | Date effective to | ETLMOj+ | ETLMOj- |
| 01/04/2021 | 31/05/2021 | -0.01442 | 0.00782 |
| 01/06/2021 | 31/08/2021 | -0.01415 | 0.00977 |
| 01/09/2021 | 30/11/2021 | -0.01395 | 0.00872 |
| 01/12/2021 | 28/02/2022 | -0.01569 | 0.00436 |
| 01/03/2022 | 31/03/2022 | -0.01442 | 0.00782 |
Note: the spring season is split into two periods, April to May 2021 and March 2022, to align with the BSC Year.
How are ETLMO values used?
The Balancing Mechanism Reporting Agent (BMRA) uses ETLMO values to calculate indicative charges and payments for Balancing Mechanism (BM) actions, and the Energy Imbalance Price, in near to real-time.
ETLMO values are used to report indicative data on the Balancing Mechanism Reporting Services (BMRS), and will be published within the Operational Data section of the Elexon Portal.
ETLMO values have been calculated for each season across the 2021/22 BSC Year, following the implementation of Approved BSC Modification P350 ‘Introduction of a seasonal Zonal Transmission Losses scheme’ on 1 April 2018.