national grid: nts operation...2 key roles of the system operator safe, reliable and efficient...
TRANSCRIPT
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National Grid: NTS Operation
Carrie Clifford
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Key roles of the System Operator
Safe, reliable and efficient operation of the National
Transmission System (NTS)
Residual Energy Balancing of the Gas Market
Response & Management of events and emergencies
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St. Fergus
Teesside
Easington
Theddlethorpe
Bacton
Barrow
Burton Point
Isle of Grain
Milford Haven
Gas Transmission in Great Britain
~8,200km pipeline
Operating pressure 70 - 94bar
7 Beach Reception Terminals
3 LNG Importation Terminals
3 Interconnectors
10 storage sites
23 compressor stations
200+ Exit Points
Highest Demand Day : 465 mcm
Lowest Demand Day : 117 mcm
Annual Throughput : 85 bcm
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Supply & Demand
Terminal Supply
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Isle Of Grain
St. Fergus
Teesside
Theddlethorpe
Easington (inc. Rough )
Bacton
Burton Point
Barrow
Milford Haven
SRS & MRS
Winter 2014/15
Increase from previous winter
Decrease from previous winter
Terminal Supply Comparison
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Supply Breakdown
UKCS
Norway
LNG
Interconnectors
Storage Withdrawal
Winter 2014/15
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LNG
Instantaneous Supply v Demand
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30 Day Rolling Average LP Swing
Linepack Swing Winter 2002/03 Winter 2007/08 Winter 2012/13 Winter 2013/14 Winter 2014/15
Maximum 18.9 18.7 29.9 28.7 38.6
Average 4.7 8.6 13.9 15.3 14.7
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Operations
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Planning for a Gas Day
Year Ahead Day Ahead Day
NTS Maintenance Planning
NTS Supply & Demand Forecasting
NTS Capability & Risk (inc SO incentive opportunity & risk)
Shipper Re-Nominations
Customer Physical
Supply & demand profiles
NTS Capacity Sales
Unplanned events
Y2 Y3+ Month Ahead Week Ahead
Operating Plans
NTS Offline Network Simulation Scenarios
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Daily Operations
Accommodate Supply/Demand Profiles
Pressure Obligations
Enable System Access requirements
Efficient Compressor Operation
Maintain/ Manage NTS Linepack
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System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Operating Margins
Pressure Terminal
Flow Advice
(Entry)
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
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System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Operating Margins
Pressure Terminal
Flow Advice
(Entry)
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
15 15
System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Operating Margins
Pressure Terminal
Flow Advice
(Entry)
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
16 16
System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Operating Margins
Pressure Terminal
Flow Advice
(Entry)
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
Balancing Responsibilities
Shippers Role
Obliged to provide commercial input and output nominations
(forecasts)
No obligation to physically balance portfolio
Incentivised to balance portfolio
Gas Supply Gas demand
NTS Connected Sites
Obliged to provide physical
entry profiles (DFN’s)
NTS Connected Sites
Obliged to provide physical
exit profiles (OPN’s)
National Grid’s Role – Residual Balancer
Ensure overall NTS balance is within safe physical operating
parameters
Neutral to direct costs of system balancing
Cost or revenue of retaining a physical balance of the NTS is
smeared back out to the Shipping community through
‘Neutrality’
Residual Balancing
System
Light
System
Heavy
Linepack is the volume of gas held in the NTS (sum of all the gas in the pipes)
Projected
Closing
Linepack
OPN
Demands
DFN
Inputs
Opening
Linepack +
Gas Day Chart
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Instantaneous Supply v Demand
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Gas Day Chart
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System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Operating Margins
Pressure Terminal
Flow Advice
(Entry)
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
23
Margins Notice (MN)
A MN will remain in place until the end of the gas day to which it is applicable, unless
superseded by a Gas Deficit Warning.
The Margins Notice report is published daily providing a rolling five day view of supply
& demand data and information relating to storage Safety Monitors
http://www2.nationalgrid.com/uk/industry-information/gas-transmission-system-
operations/balancing/daily-margins-notice-report/
A D-1 Notification issued by NTS via ANS to all NTS users.
Purpose:
1. To provide a high level, day ahead notice of a potential supply/demand imbalance for
the coming Gas Day and;
2. To encourage NTS users to take heed of the rolling Daily Margins Report and
reassess their position relative to prevailing forecasts.
Daily
Methodology
A warning issued by NTS via ANS to all NTS users
Purpose:
To stimulate a market response to address the EOD forecast significant NTS physical EOD
imbalance.
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National Gas Deficit Warning (GDW)
Methodology
The GNCC have full discretion on the
issue of a GDW, there are no predefined
triggers.
The GDW can be issued in advance
of or during the Gas Day.
Potential Triggers
Actual/Forecast
Demand
Other
relevant
information
A GDW withdrawal notice will be
issued when appropriate to retract the
active GDW.
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System Operator Actions
Network Management
Operational
tools (internal)
Operational tools
(external) Commercial tools
Network
Integrity
Reconfigure
Network
Redistribute
Linepack
Utilise
Compressors
Move / cancel
Maintenance
Agree revised
Pressures
Flow Swaps
Enforce Contractual
Offtake Rules
Scaleback
‘Interruptible’
Capacity
Gas Quality Terminal
Flow Advice
Residual balancing
actions
Locational Energy
Actions
Short term NTS Flex
Restrictions
Margins Notice
Constraint
Management Actions
Pressure Terminal
Flow Advice
(Entry)
Operating Margins
Shutdown sites
Critical
Transportation
Constraint
Information Provision (MIPI / Website / Gemini)
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Winter Preparations
27
Winter Preparations
October onwards…
Winter Consultation & Outlook
Offtake Capacity Statement process
(DN Assured Pressures)
Asset Assurance
Summer September
Daily monitoring of
Storage safety monitors
Winter Simulation scenarios
Margins Notice Reset
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Questions
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