This directory contains the modelling files used to calculate the incidence of modelled transition charges for the Authority's TPM options working paper. To reproduce the analysis, unzip all files in the package and then follow the instructions in: - the 'Scenario_as_an_SQL_table' directory, - then the 'Preprocessing' directory, - then the directories relating to individual charges - 'AoB', 'Deeper_connection', 'LRMC', 'SPD', 'Status_quo_HVDC' and 'Status_quo_interconnection' - in any order, - finally, the 'Combinations' directory. Note, however, that you will not be able to reproduce some aspects of the analysis, because some input tables (relating to reconciliation information, which is used as an allocator for some charges) are commercially sensitive so are not distributed as part of the package. For further information about the modelled scenario, input assumptions, and methodology, please consult the TPM options working paper (particularly Appendix A) and the companion paper on deeper connection, and/or direct your queries to the Authority. Further information about the flow tracing analysis can be found at https://github.com/ElectricityAuthority/tracing. 16 June 2015. Postscript: Please be aware that on several occasions since 16 June 2015, the TPM team have updated some files in this directory. The most recent update occurred on 31 July 2015.