1. Additional Gemini API’s UK Link - Class 3 Modification
Transmission Workstream
2nd February 2006

2. Scope of Modification Proposal
Facilitate development of 3 additional API (Application Programming Interface) functions for the Gemini Entry Capacity module (to be specified in UK Link manual):
Confirm Trade
Reject Trade
Withdraw Trade
Ensure recovery of development and implementation costs from UK Link Users
Estimate is circa £41K
A more accurate estimate can be provided once the payment, charging methodology and release dates are known, and whether such change is incorporated into a scheduled Gemini release or whether this is a single stand-alone release

3. Options for cost allocation
Option 1. Originator of change request pays
Option 2. UK Link Users each pay equal proportion
Option 3. Base on measure of “volume usage” for previous Gas Year
Annual throughput (sum of UDQIs and UDQOs)
Sum of UDQIs (not including NBP trades)
Total entry capacity booked
Total quantity of entry capacity traded