Glossary of terms

Here you can find the meanings of abbreviations, acronyms, and industry terms that we use. 


A2O - Application to offer  gas connections

AAHEDC - Assistance for areas with high electricity distribution  electricity

ACER - Agency for the Cooperation of Energy Regulators  gas and electricity

ANS - Active Notification System  gas

ASEP - Aggregated system entry point  gas

AQ - Annual quantity  gas

ARA - Annual report and accounts  gas and electricity


BCA - Bilateral connection agreement  electricity

BEGA - Bilateral embedded generation agreement  electricity

BELLA - Bilateral embedded licence exemptible large power station agreement  electricity

BM - Balancing Mechanism  electricity

BMRSBalancing Mechanism Reporting System  electricity 

BSC - Balancing and Settlement Code  electricity

BSSG - Balancing services standing group  electricity

BSUoS - Balancing Services Use of System  electricity


CACoP - Code Administration Code of Practice  electricity

CAM - Capacity Allocation Mechanism  gas

CBSG - Commercial balancing services group  electricity

CES - Commercial Engineering Services  electricity

CHP - Combined heat and power  gas

ChUG - Charging user group  electricity

CLoCC - Customer low-cost connections  gas

CMN - Capacity Market Notices  electricity

CSEP - Connected system entry point  gas

CUSC - Connection and Use of System Code  electricity

CV - Calorific value  gas

CWV - Composite weather variable  gas


D - The gas day  gas

DAI - Day-ahead interruptible  gas

DECC - Department of Energy and Climate Change

DFN - Daily flow notification(s)  gas

DFO - Delivery facility operator(s)  gas

DMC - Daily metered consumer(s)  gas

DN - Distribution network  gas and electricity

DNO - Distribution network operator  gas and electricity

DRC - Data Registration Code  electricity

DSR - Demand side response  gas and electricity


EBI - Energy balancing invoice  gas

ECQ - Emergency curtailment quantity  gas

EFCC - Enhanced Frequency Control Capability  electricity

EFR - Enhanced frequency response  electricity

EMR - Electricity Market Reform  electricity

ENC - European network codes  electricity

ENTSOG - European Network of Transmission System Operators for Gas  gas 

EOD - End of day  gas

ERPS - Enhanced reactive power service  electricity

ESO - Electricity System Operator  electricity

ETO - Electricity Transmission Owner  electricity

ETR - European Transparency Regulation

ETYS - Electricity Ten Year Statement  electricity

EV - Electric vehicles  electricity


FCF - Firm curtailment factor  gas

FCO - Full connection offer  gas

FES - Future Energy Scenarios

FFR - Firm frequency response  electricity


GC - Grid Code  electricity

GCD - Gas charging discussion  gas

GCDF - Grid code development forum  electricity

GDW - Gas deficit warning  gas

GFOP - Gas Future Operability Planning  gas 

GHG - Greenhouse Gas  gas

GMRS - Gas Market Reporting System  gas 

GSG - CUSC governance standing group  electricity

GS(M)R - Gas Safety (Management) Regulations  gas 

GSO - Gas System Operator  gas

GT - Gas transporter  gas

GTO - Gas Transmission Owner  gas

GTYS - Gas Ten Year Statement  gas


HAP - Highest accepted price  gas

HSE - Health and Safety Executive


ICF - Interruptible curtailment factor  gas

ICO - Initial connection offer  gas

IECR - Incremental entry capacity release  gas

IP - Interconnection point  gas


JESG - Joint European stakeholder group  electricity

JPC - Joint planning committee  electricity


Kw - Kilowatt  electricity

Kwh - Kilowatt hour  electricity


LAP - Lowest accepted price  gas

LDTEC - Limited duration transmission entry capacity  electricity

LDZ - Local distribution zone  gas

Linepack - the amount of gas within the system at any time  gas

LNG - Liquefied natural gas  gas

LRS - Long range storage  gas


MCM - Million cubic meters  gas

MFR - Mandatory frequency response  electricity

MIPI - Market Information Provision Initiative  gas

MN - Margins notice  gas

MODIS - Market Operation Data Interface System  electricity

MRS - Medium range storage  gas

MSEC - Monthly system entry capacity  gas


NBP – National balancing point  gas

NDM - Non-daily metered   gas

NETS - National Electricity Transmission System  electricity

NGP - National Grid Property

NGSE - Network gas supply emergencies  gas

NOA - Network Options Assessment

NRAPMNegative Reserve Active Power Marginelectricity

NSL - Network sensitive load  gas

NTS - National Transmission System  gas


OCM - On-the-day commodity market  gas

Ofgem - Office of Gas and Electricity Markets

OM - Operating Margins  gas

OPN - Offtake profile nominations  gas

ORPS - Obligatory reactive power service  electricity

OTC - Over the counter  gas

OUG - Own use gas  gas


PARCA - Planning and Advanced Reservation of Capacity Agreement  gas

PCLP - Projected closing linepack  gas

PMC - Pipeline Maintenance Centre  gas

PRI charge - Physical renomination incentive charge  gas


QSEC - Quarterly system entry capacity  gas


REMIT - Regulation on wholesale energy markets integrity and transparency  gas and electricity

RIIO - Revenue = Incentives + Innovation + Outputs  regulatory framework

RMSEC - Remaining monthly system entry capacity  gas


SAP - System average price  gas

SCCA - Storage curtailment compensation arrangements  gas

SF - Scaling factor  electricity

SFN - Storage flow notification  gas

SMP - System marginal price  gas

SND - Seasonal normal demand  gas

SO - System operator  gas and electricity

SO to SO - System operator to system operator  electricity

SOF - System Operability Framework

SOQ - Supply offtake quantity  electricity

SQSS - Security and Quality of Supply Standards  electricity

SRS - Short range storage  gas

STC - System operator Transmission owner Code  electricity

STOR - Short-term operating reserve  electricity

STTEC - Short-term transmission entry capacity (firm access service)  electricity


TCMF - Transmission charging methodology forum  electricity

TEC - Transmission entry capacity  electricity

TNUoS - Transmission Network Use of System  electricity

TO - Transmission owner  gas and electricity

TPC - Transmission Planning Code  gas

TRW Transmission reinforcement works  electricity

TSS - Transportation Support Services  gas

TWRTransmission works register  electricity


UAG - Unaccounted for Gas  gas

UNC - Uniform Network Code  gas


VIP - Visual Improvement Provision

VLDMC - Very large daily metered consumer  gas


WAP - Weighted average price  gas

WCF - Weather correction factor  gas