Transmission Loss Adjustment Factors
Transmission Loss Adjustment Factors
Losses are incurred on the Transmission System as electricity is transported from generators to the transmission / distribution interface. In settlement, the transmission losses are allocated to generators (including generators embedded in the distribution system), using Transmission Loss Adjustment Factors (TLAFs). Some generators are responsible for proportionally more transmission losses than others, depending on their point of connection to the grid. For this reason, TLAFs are site specific.
The following parties are subject to transmission losses:
- Generators (including green) connected to the transmission network .
- Distribution connected (embedded) generators (including green) connected after 19 February 2000.
The following principles apply to the treatment of transmission loss factors:
- Loss factors are calculated by the TSO and approved by the Commission for Energy Regulation (CER) on an annual basis.
- The TSO derives TLAFs using marginal loss factors.
The TSO scales the marginal loss factors to ensure that throughout the year only average losses are recovered. These final values, after scaling, are the TLAFs. Marginal loss factors are scaled to derive the TLAFs so that the allocations they produce will equal the predicted average transmission losses.
Further information on the TLAFs and their calculation can be found in the TLAF Methodology Explanatory Paper v1.0 published 27th September 2012.
|
2013/2014 Proposed TLAFs | Effective Date |
|---|---|
| 13-14 PROPOSED TLAFS NOTE v1.0.pdf | 20-05-13 |
| 13-14 PROPOSED TLAFs ROI 20-05-13 v1.0.xlsx | 20-05-13 |
| 13-14 PROPOSED TLAFs ROI MARKET PARTICIPANT 20-05-13 v1.0.pdf | 20-05-13 |
| 13-14 PROPOSED TLAFs ROI STATION 20-05-13 v1.0.pdf | 20-05-13 |
|
SEM Transmission Loss Adjustment Factors – 2012/2013 |
Effective Date |
|---|---|
|
2012-2013 ROI Market Participant CLAFs DLAFs TLAFs v 7.0.pdf |
22-03-13 |
| 2012-2013 ROI Market Participant CLAFs DLAFs TLAFs v 7.0.xlsx | 22-03-13 |
| 2012-2013 Approved ROI Transmission Node TLAFs | 27-09-12 |
Archive TLAF Documentation
- SEM Transmission Loss Adjustment Factors
- Transmission Loss Adjustment Factors – (Pre SEM)