Assignment Workshop 2
16th September 09, Solihull
Overview
 Background
 ROM 1387
 ROM 1585
 ROM Analysis Explanation
 Questions
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Background
 National Grid NTS has had a number of discussions with Industry
about the concept of NTS Entry Capacity Assignment:
“ NTS Entry Capacity assignment entails the transfer of financial liability in
addition to the entry capacity entitlement ”
 National Grid NTS raised 2 Rough Order of Magnitudes (ROMs)
with xoserve:
 EVS1387
 EVS1585
 Please note that a ROM request is not based on formal systems
analysis and is not a replacement for a detailed analysis and must
not be taken as a formal quote
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ROM EVS1387 – Generic Assignment Process
 ROM EVS1387 based on the following requirements:
 User driven (NG or Shipper)
 Applicable from a future date
 On an enduring basis
 Includes both full and partial assignment
 Assigned NTS Entry Capacity to be tradable
 Assigned NTS Entry Capacity to be tracked
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ROM EVS1585 – As part of Voluntary Discontinuance
 Deliver National Grid NTS’ UNC obligation
 To facilitate the voluntary discontinuance of a redundant
shipper short-code
 Requirements of ROM EVS1585
 Enable the assignment of long term entry capacity rights
as part of an assignment of rights and obligations – not as
an assignment of NTS Entry Capacity.
 The existence of long term entry capacity entitlement and
liabilities are assigned to 1 single specified shipper
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ROM Process
Presented by xoserve
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ROM Process Overview (1)
 A defined method to request and receive appropriate
analysis to support the development of industry changes.
 It has been incorporated into MOD 213.
 A light process that balances flexibility and control
 A process capable of aligning to the needs and timelines
of industry change processes (subject to resources and
priorities)
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ROM Process Overview (2)
 ROM requests should be timed in relation to the state of the proposed
change;
 Likelihood that the change will be supported / funded by the community
and approved by the regulator
 Clarity and stability of objectives, rules and requirements
 Input needed to initiate ROM analysis;
 As per ROM template:
 Documented business objectives
 Documented business principles
 Documented draft business rules
 Performance considerations .i.e. best estimate for…
 Volumes for transactions / business events
 Timeframe for transactional purposes
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Limitations of ROM exercise (1)
 Following analysis of the business rules, a number of
techniques are used to derive alternate estimates which are
then used to specify the range of cost estimates. Techniques
include:
 Rough estimation by experienced solution experts
 Identification of impacted and new logical functional
elements and comparison to the equivalent functional
elements for a previous project already costed. The
comparison is used to extrapolate a ROM cost for the
potential change.
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Limitations of ROM exercise (2)
 The analysis is limited by time and is only a snapshot of
xoserve’s understanding of the change at that moment.
Consequently,
 ROM costs are highly indicative;
 Decisions to proceed to delivery should only be based on
detailed cost analysis (DCA) obtained through the MOD 213
process.
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Next Steps
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Next Steps
 Industry need to consider options for best fit and discuss
within their workgroups
 Develop business rules, system requirements, funding
arrangements (etc)
 When Industry in accord
 Submit Draft Modification Proposal
 Submit request to xoserve for Detailed Cost Analysis
(DCA) via National Grid NTS
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