Risk Assessment of Gas Transportation Invoices
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Risk Assessment of Gas Transportation Invoices - business change facilitation using risk modelling
Sallyann Blackett and Chris Smith balance in gas.
Introduction of a complex new process needs careful consideration to ensure JulI understanding by all parties. It is not always easy to see which cníitrihuting processes have most znjluence or how accurate ¿lii o; nah process is in practice. It
This amount is apportioned to
domestic Shippers based on their market share.
RhD is obviously a complex process involving algorithms based on data from several feeding
can also he difficult toj?stcr acctptai/ce and confidence ro tile new process. In such cases risk modelling can be an effictive
processes. To build confidence in the methodology, Transco and Shippers required an objective assessment of potential variation and errors and a means of monitoring performance. Cap Gemini
method of analysing the potential variation and errors, and /roztding a method of monitoring pejorniance oft/ic process. This paper describes the approach adopted Jhr resolving issues raised br a new method/hr invoicing gas shifpeiic Iy Transco.
was commissioned by Transco and Shippers to undertake this work.
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Risk modelling approach
Transco is a Iart of BG pic and is a UK gas
transporter. It transports gas for its customers, the 50 or so gas supply companies known as Shippers, through a gas transportation network designed and
The approach adopted by Cap Gemini was to work with both Shippers and Transco in identifying their requirements. A list of all processes that impacted RbD was compiled. Using this list as a basis for
built on an integrated basis across the UK. An
clement of the invoicing of Shippers to domestic customers Ihr transporting gas on their behalf utilises a new process, Reconciliation by Difference (RbD).
discussion, the processes were split into groups depending on whether they were felt to have a major, moderate or minor impact. To simplify the
Estimates of gas transported for Shippers are
model, only processes fèlt to have a major impact, or
When meters are read for large customers the meter reading is used to calculate a 'true' consumption that is compared with the deemed consumption. The difThrence between the two readings is a reconciliation that will lead to a charge or refund to the Shipper supplying the consumer. This process is accurate but intensive and was thought to present high risk and costs, to both Transco and Shippers, if implemented for 19 million domestic consumers.
included in the model.
Very large consumers will have meters that are read on a daily basis (DM). The remaining large
involved felt they had a chance to influence its
those critical to calculation of the charges, were
calculated on a daily basis (known as deeming).
A qualitative model was produced using data flow diagrams and Ishikawa diagrams. These techniques allowed the impacts to he visualised and promoted further discussion with Transco arid Shippers. Once a consensus had been achieved on the processes that would be m
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