A
A2O - Application to offer
ACER - Agency for the Cooperation of Energy Regulators
ANS - Active Notification System
ASEP - Aggregated system entry point
AQ - Annual quantity
ARA - Annual report and accounts
Average Winter - The average winter condition that has applied over the last 86 years
B
BASICS - BASICS
BBL - Balgzand - Bacton Line
bcm - Billion cubic meters
BEIS - Department for Business, Energy and Industrial Strategy
C
CAM - Capacity Allocation Mechanism
CHP - Combined heat and power
CLoCC - Customer low-cost connections
Close-Out Date - The last date for information revision on gas flow quantities on the NTS
Closing Linepack (CLP) - The volume of gas held within the NTS at the end of the gas day (06:00hrs)
CM - Capacity Market
Cold day - A day approaching 0 degrees CWV
Combined Cycle Gas Turbines - A unit where electricity is generated by a gas powered turbine and a second turbine
Composite weather variable (CWV) - A weather variable that is linearly related to non-daily metered gas demand
Compressor - Compressors are used to move gas around the network through high pressure pipes
CSAT - Customer Satisfaction
CSEP - Connected system entry point
CV - Calorific value
CWV - Composite weather variable
Cycling rates - The average number of times a reservoir’s working gas volume can be turned over during a specific period of time
D
D - The gas day
DA - Day ahead
DAI - Day-ahead interruptible
DECC - Department of Energy and Climate Change
DFN - Daily flow notification(s)
DFO - Delivery facility operator(s)
DM - Daily metered
DMC - Daily metered consumer(s)
DN - Distribution network
DNO - Distribution network operator
DSR - Demand side response
E
EBI - Energy balancing invoice
ECQ - Emergency curtailment quantity
ENA - Energy Networks Association
ENTSO-G - European Network of Transmission System Operators for Gas
EOD - End of day
ETR - European Transparency Regulation
F
FCF - Firm curtailment factor
FCO - Full connection offer
FES - Future Energy Scenarios
G
GCD - Gas charging discussion
GDW - Gas deficit warning
GFOP - Gas Future Operability Planning
GHG - Greenhouse Gas
GMRS - Gas Market Reporting System
GS(M)R - Gas Safety (Management) Regulations
GSO - Gas System Operator
GT - Gas transporter
GTO - Gas Transmission Owner
GTYS - Gas Ten Year Statement
GWh - Giga Watt hours that is 1,000,000,000 Watt hours
H
HAP - Highest accepted price
HSE - Health and Safety Executive
I
ICF - Interruptible curtailment factor
ICO - Initial connection offer
IECR - Incremental entry capacity release
Interconnector - Natural gas pipe lines that connect gas transmission systems from other countries to the NTS
IP - Interconnection point
J
K
Kwh - Kilowatt hour
L
LAP - Lowest accepted price
LDZ - Local distribution zone
Linepack - the amount of gas within the system at any time
LNG - Liquefied natural gas
Load - The energy demand experienced on a system
Locational balancing actions - A physical market transaction pursuant to which the originating user agrees to make a flow change
LRS - Long range storage
M
Margin - The difference between the level of demand and supply that is available to meet it
Marginal generation (MG) - The less favourable commercial generation option when all the options are ranked in an economic merit order
MCM - Million cubic meters
MIPI - Market Information Provision Initiative
MN - Margins notice
MRS - Medium range storage
MSEC - Monthly system entry capacity
MW - Megawatt
N
NBP – National balancing point
NDM - Non-daily metered
NGP - National Grid Property
NGSE - Network gas supply emergencies
NOA - Network Options Assessment
NSL - Network sensitive load
NSS - Non Storage Supply
NTS - National Transmission System
O
Obligated - The amount of Baseline Capacity, and any Incremental Capacity that exists, that National Grid is required to make available on every day of the year
OCM - On-the-day commodity market
Ofgem - Office of Gas and Electricity Markets
OM - Operating Margins
OPN - Offtake profile nominations
OTC - Over the counter
OUG - Own use gas
P
PARCA - Planning and Advanced Reservation of Capacity Agreement
PCLP - Projected closing linepack
Peak - Denotes the maximum power requirement of a system at a given time, or the amount of power required to supply customers at times when need is greatest
Peak day - The highest demand for gas, or electricity, on any day in that year
PMC - Pipeline Maintenance Centre
PRI charge - Physical renomination incentive charge
Projected Closing Linepack - The predicted volume of gas held within the NTS at the end of the gas day (06:00hrs)
Q
QSEC - Quarterly system entry capacity
R
RB - Residual Balancer
REMIT - Regulation on wholesale energy markets integrity and transparency
RIIO - Revenue = Incentives + Innovation + Outputs regulatory framework
RMSEC - Remaining monthly system entry capacity
S
Safety Monitor - A system to ensure that sufficient gas is held in storage to support those gas consumers whose premises cannot be physically and verifiably isolated from the gas network within a reasonable time period
Safety Monitor Space Requirements - The percentage of all the assumed storage space which is required to satisfy the Safety Monitor
SAP - System average price
SCCA - Storage curtailment compensation arrangements
SF - Scaling factor
SFN - Storage flow notification
SMP - System marginal price
SND - Seasonal normal demand
SO - System operator
SOF - System Operability Framework
SOQ - Supply Offtake Quantity
SRS - Short range storage
SSAT - Stakeholder satisfaction
T
TO - Transmission owner
TPC - Transmission Planning Code
TSS - Transportation Support Services
U
UAG - Unaccounted for Gas
UKCS - United Kingdom Continental Shelf
UNC - Uniform Network Code
Undiversified - Undiversified demand is used where location is important, such as for network models
V
VIP - Visual Improvement Provision
VLDMC - Very large daily metered consumer
W
WAP - Weighted average price
WCD - Weather corrected demand
WCF - Weather correction factor
WD - Within day
X
Y
Z