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Climate Change: Greenhouse Gases

Answer

The following information has been taken from the Digest of UK Energy Statistics 2006.

					GWh
	2001	2002	2003	2004	2005
Metering differences ¹	1,798	1,821	-874	137	2,880
Leakage assessment ²	4.436	5,283	4,452	5,414	5,260
Own use gas ³	436	427	439	437	425
Theft 4	2.190	2,134	2,197	2,186	2,124
Total Losses	8,862	9,665	6,214	8,174	10,689
¹ Measurement of gas flows, in volume and energy terms, occurs at several points along the supply chain. As such, differences are seen between the actual recorded flow through any one point and estimates calculated for the flow of gas at that point.
² This is a National Grid assessment of leakage through the local distribution system based on the National Leakage Reduction Monitoring Model.
³ Equivalent to about 0.06 per cent of the local distribution zones (LDZ) throughput. This is an assessment of the energy used to counter the effects of gas cooling on pressure reduction.
4 Calculated by National Grid as 0.3 per cent of LDZ throughput, this is theft before the gas reaches customer meters.

National Grid and the Independent Gas Network operators have plans to replace iron gas mains with polyurethane pipes, which will progressively reduce the loss from leakage and benefit the environment.

Secondary information

Type

Written question

Reference

218; 687 c71-2WA

Session

2006-07

Subjects

Air pollution Natural gas Pollution control Pipelines Repairs and maintenance Methane

Contains statistics

Yes

Link

View this Written question on www.publications.parliament.uk