Dimension

Indicator

Sources

Observations

Capacity, access and availability

Gas import capacity
(as a percentage of total gas supplies)

Import capacity: National Grid 2010 Ten year statement Figure 4.8A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Total gas supplies: National Grid 2010 Ten year statement Figure 4.2A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Geographical coverage: United Kingdom

Gas storage capacity
(as a percentage of total gas supplies)

Storage capacity: National Grid 2010 Ten year statement Figure 4.7A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Total gas supplies: National Grid 2010 Ten year statement Figure 4.2A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Geographical coverage: United Kingdom

Asset or capacity utilisation

Average import capacity utilization
(percentage)

Imports: National Grid 2010 Ten year statement Figure 4.2A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Geographical coverage: United Kingdom

Peak import capacity utilization
(percentage)

Peak imports: National Grid 2010 Ten year statement Figure 4.8A, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Geographical coverage: United Kingdom

Peak import capacity is calculated by dividing the annual import capacity by 365 to find a daily import capacity

Existing UK gas stocks as a percentage of capacity
(percentage)

Stocks: Department of Energy and Climate Change DUKES Table 4.3, http://www.decc.gov.uk/assets/decc/statistics/source/gas/dukes4_3.xls 

Geographical coverage: United Kingdom

Capacity figures Converted from billion cubic metres to GWh assuming 11.02 kWh per cubic metre

UK gas supply cover
(percentage)

Peak demand: National Grid 2010 Ten year statement Figure 4.2B, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Peak supply: National Grid 2010 Ten year statement Figure 4.2B, http://www.nationalgrid.com/NR/rdonlyres/E60C7955-5495-4A8A-8E80-8BB4002F602F/44901/TYS_2010_Charts.xls

Geographical coverage: United Kingdom

Calculated as peak supply / peak demand

Service quality and reliability

Gas supply interruptions
(interruptions per 10,000 customers)

Supply interruptions: data obtained from Ofgem http://www.ofgem.gov.uk/Networks/GasDistr/QoS/Pages/QoS.aspx

Geographical coverage: Great Britain

Asset condition

Gas distribution leakage
(as a percentage of gas input in the distribution network)

Leakage: Department of Energy and Climate Change DUKES Table 4.3, http://www.decc.gov.uk/assets/decc/statistics/source/gas/dukes4_3.xls 

Gas output from the national transmission system: Department of Energy and Climate Change DUKES Table 4.3, http://www.decc.gov.uk/assets/decc/statistics/source/gas/dukes4_3.xls

Geographical coverage: United Kingdom

Gas output from the national transmission system equals gas input into the distribution network