This describes the source and purpose of each of the data files available for download from the TLFs Determination page of the Elexon Portal.

<div data-id="summary" style="text-align:left">Summary</div>

<div data-id="introduction" style="text-align:left">Introduction</div>

<div data-id="tlfa-i001---reference-network-mapping-statement" style="text-align:left">TLFA-I001 - Reference Network Mapping Statement</div>

<html><head></head><body><div data-id="tlfa-i002---load-periods-and-sample-settlement-periods" style="text-align:left">TLFA-I002 - <u class="defined-term">Load Period</u>s and <u class="defined-term">Sample <u class="defined-term">Settlement</u> Period</u>s</div></body></html>

<html><head></head><body><div data-id="tlfa-i003---metered-volumes-for-sample-settlement-periods" style="text-align:left">TLFA-I003 - <u class="defined-term"><u class="defined-term">Meter</u>ed Volume</u>s for <u class="defined-term">Sample <u class="defined-term">Settlement</u> Period</u>s</div></body></html>

<div data-id="tlfa-i004---transmission-network-data" style="text-align:left">TLFA-I004 - Transmission Network Data</div>

<html><head></head><body><div data-id="tlfa-i005---hvdc-metered-volume-data-for-sample-settlement-periods" style="text-align:left">TLFA-I005 - HVDC <u class="defined-term"><u class="defined-term">Meter</u>ed Volume</u> Data for <u class="defined-term">Sample <u class="defined-term">Settlement</u> Period</u>s</div></body></html>

<div data-id="tlfa-i006---distribution-network-data" style="text-align:left">TLFA-I006 - <u class='defined-term'>Distribution Network Data</u></div>

<html><head></head><body><div data-id="tlfa-i007---total-delivering-and-offtaking-metered-volume-data" style="text-align:left">TLFA-I007 - Total Delivering and Offtaking <u class="defined-term"><u class="defined-term">Meter</u>ed Volume</u> Data</div></body></html>

<div data-id="input-data-flows" style="text-align:left">Input Data Flows</div>

<div data-id="tlfa-i008---nodal-tlfs" style="text-align:left">TLFA-I008 - Nodal TLFs</div>

<div data-id="tlfa-i009---adjusted-seasonal-zonal-tlfs" style="text-align:left">TLFA-I009 - Adjusted Seasonal Zonal TLFs</div>

<html><head></head><body><div data-id="tlfa-i010---bm-unit-specific-tlfs" style="text-align:left">TLFA-I010 - <u class="defined-term">BM Unit</u> Specific TLFs</div></body></html>

<div data-id="tlfa-i011---seasonal-zonal-tlfs" style="text-align:left">TLFA-I011 - Seasonal Zonal TLFs</div>

<div data-id="tlfa-i012---tlf-adjustment" style="text-align:left">TLFA-I012 - TLF Adjustment</div>

<div data-id="tlfa-i013---indicative-tlm-amp-tlmo-values---part-1-tlfij0" style="text-align:left">TLFA-I013 - Indicative TLM &amp; TLMO Values - Part 1 (<u class='defined-term'>TLF<sub>ij</sub></u>=0)</div>

<div data-id="tlfa-i014--indicative-tlm-amp-tlmo-values---part-2-tlfij0" style="text-align:left">TLFA-I014 – Indicative TLM &amp; TLMO Values - Part 2 (<u class='defined-term'>TLF<sub>ij</sub></u>≠0)</div>

<div data-id="tlfa-i015---adjusted-nodal-power-flows" style="text-align:left">TLFA-I015 - Adjusted Nodal Power Flows</div>

<div data-id="tlfa-i016---branch-power-flows" style="text-align:left">TLFA-I016 - Branch Power Flows</div>

<div data-id="tlfa-i017---absolute-nodal-power-flows" style="text-align:left">TLFA-I017 - Absolute Nodal Power Flows</div>

<div data-id="output-data-flows" style="text-align:left">Output Data Flows</div>

<div data-id="further-information" style="text-align:left">Further Information</div>

CONTENTS

Transmission Loss Factor (TLF) Determination V4.0

Defined Terms

Cross-references