1. Tony Pearson, Network Planning Manager
Interruption Process 2009
Tony Pearson, Network Planning Manager

2. Summary 2008 Process 2009 Process
Secured sufficient interruption for 2011 / 12 in three out of eleven zones
Secured some further interruption in two of these zones for 2012 / 13, and in one zone for 2013 / 14
2009 Process
Subject to approval of Mod 247, NGN will be inviting offers in the remaining 8 zones for 2011 / 12
Where required, NGN will also be inviting offers in zones 1 to 11 for years 2012 / 13 to 2016 / 17

3. Summary 2009 Process (cont...)
Assessed our requirements in the same way as last year, taking account of interruption already secured
Offers are sought in the same way as last year
1:20 Peak Day and 1:50 severe Duration
For each zone and each year we have identified three “volume” blocks to cover our forecast severe curve
Not absolutely necessary to seek to exactly match our minimum requirement – if separate tranches are offered for individual sites it is important that these can be exercised
Happy to discuss / explain further if required

4. Interruption Zones for 2009 Tenders10 8
Year
Zones Where Tenders Invited
2011/12
All except 7, 9 & 11
2012/13
All except 11
2013/14
2014/15
All
2015/16
2016/17 9 7 3 11 1 5 4 6 2

5. Indicative Interruption Requirements
Northern Gas Networks' Indicative Interruption Requirements 2011/12 to 2016/17 (Y+2 to Y+7)
All capacity figures are in kWh / day
Zone
Description
Applicable period (Y+3 = 1 Oct Sept 2013)
Aggregate Interruptible Capacity Required
Period 1 (days)
Minimum Capacity required in Period 1
Period 2 (days)
Minimum Capacity required in Period 2
Period 3 (days)
Minimum Capacity required in Period 3 GT
North West Leeds
Y+2 to Y+7
151,993 10 33
132,152
64,930 GT
Kirklees
279,026 28
237,428 27
116,348 GT
Yorkshire Coast
53,854 12 GT
East leeds
218,393 16
170,728 19
84,309 GT
East Riding
47,803 25
39,997 24
19,480 GT
Humberhead
41,006 49
37,293 58
18,269 GT
Teesdale
Y+2
n/a
Y+3 to Y+7
191,413
149,699
74,757 GT
County Durham
106,029 14
77,689
37,891 GT
Cumbria
Y+3
3,429,400 7
2,053,567
746,483
Y+4 to Y+7
3,575,000 11
2,172,083 17
964,167 GT
Tyne Valley
382,062 42
331,582 53
162,090 GT
Vale of York
Y+2 to Y+4
Y+5 to Y+7
147,101
114,623
54,376
Alternative Cumbria 2012 / 13 requirement
2,929,400
1,553,567
1,002,733

8. Any Questions?