interruptions to supply | national grid
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08/04/2014 16:57Interruptions to supply | National Grid
Page 1 of 2http://www2.nationalgrid.com/uk/industry-information/gas-transmission-system-operations/interruptions-to-supply/
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Interruptions to supply
National Transmission System Consumers
There are no longer any interruptible sites connected to the National Transmission System (NTS), the high pressure gas transportationsystem which provides supplies to the Distribution Networks and a number of very large industrial consumers. From October 2012 newindustry arrangements deem all sites as firm.
Distribution Network Consumers
A small number of interruptible sites may remain in the Distribution Networks, the gas distribution systems which provide supplies to domesticand most industrial consumers, as part of commercially contracted interruption. It is also possible that industrial consumers could beinterrupted by their suppliers depending upon the commercial arrangements they have agreed to.
Capacity Products
Industrial consumers may choose to make use of firm or off peak capacity products. For further information on how these products may beimpacted by localised system constraints please refer to the NTS Exit Zones and Exit Capacity Constraint Actions page.
Gas Emergencies
The Network Emergency Co-ordinator (NEC) is appointed to be an independent body whose responsibility in a major gas supply emergencyaffecting the NTS is to co-ordinate actions across the affected parts of the network to minimise the safety consequences of the emergency.
Firm load shedding is the procedure used by transporters to secure a graduated and controlled reduction in demand on all or part of theirsystems in order to keep the system safely pressurised.
During an emergency, industrial consumers using firm capacity may be contacted by their transporter and requested to stop using gas. Consumers using the off peak capacity product can expect their off peak capacity entitlement to be scaled back prior to the declaration of theemergency.
An emergency may be caused by unforeseen circumstances such as pipeline or equipment failure, or where system demand exceeds eithertotal supply or planned system capacity.
Your Obligations
Minimising the safety impacts of emergencies requires the co-operation of everyone. All industrial consumers must be able to stop using gasfollowing a direction notice from their transporter, safely and as quickly as practical. It is a criminal offence to knowingly fail to comply with adirection notice.
Priority Consumers
The Government has defined a number of categories for priority industrial consumers. Gas supply to these consumers will be maintaineduntil operating conditions require the site to stop using gas to protect gas supplies to domestic consumers. There are currently threecategories of priority industrial consumer which are as follows:
Category AConsumers (using more than 25,000 therms per annum, 732 megawatt hours) on firm supply contracts, where a failure in the supply to theirpremises could put lives at risk. Examples of such consumers would be hospitals or homes for the elderly and disabled.
Category BDistribution Network consumers who would otherwise fall into category "A" but are deemed as interruptible supplies.
Category CConsumers operating major items of capital plant, which require time to be safely shut down and would sustain serious damage (£50 millionor more) if gas supplies ceased suddenly. Examples of such consumers would be furnaces and glass works.
If you feel your industrial premises should be classified as a priority consumer please contact your gas supplier in the first instance.
For further information contact: Emergency Planning TeamGas System OperationNational GridNational Grid HouseWarwick Technology ParkWarwick
08/04/2014 16:57Interruptions to supply | National Grid
Page 2 of 2http://www2.nationalgrid.com/uk/industry-information/gas-transmission-system-operations/interruptions-to-supply/
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