Historic Demand Data 2023

Historic electricity demand, interconnector, wind and solar outturn data for 2023. Please find a brief summary of some of the columns in the dataset:
ND = National Demand is the sum of metered generation, but excludes generation required to meet station load, hydro storage pumping and interconnector exports
TSD = Demand is equal to the ND plus the additional generation required to meet station load, pump storage pumping and interconnector exports

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Table Information

SETTLEMENT_DATE

Title Settlement Date
Type date
Description The date the historic outturn occurred.
Comment This follows clock change.
Example 2023-01-01
Unit ISO 8601

SETTLEMENT_PERIOD

Title Settlement Period
Type integer
Description The half hourly period for the historic outturn occurred. Settlement period 1 runs from 00:00-00:30.
Comment
Example 1
Unit

ND

Title National Demand
Type integer
Description This is the Great Britain generation requirement and is equivalent to the Initial National Demand Outturn (INDO) and National Demand Forecast as published on BM Reports. National Demand is the sum of metered generation, but excludes generation required to meet station load, pump storage pumping and interconnector exports. National Demand is calculated as a sum of generation based on National Grid ESO operational generation metering.
Comment
Example 21043
Unit MW

TSD

Title Transmission System Demand
Type integer
Description This is the Transmission System generation requirement and is equivalent to the Initial Transmission System Outturn (ITSDO) and Transmission System Demand Forecast on BM Reports. Transmission System Demand is equal to the ND plus the additional generation required to meet station load, pump storage pumping and interconnector exports. Transmission System Demand is calculated using National Grid ESO operational metering. Note that the Transmission System Demand includes an estimate of station load of 500MW in BST and 600MW in GMT.
Comment
Example 24680
Unit MW

ENGLAND_WALES_DEMAND

Title England and Wales Demand
Type integer
Description England and Wales Demand, as ND above but on an England and Wales basis.
Comment
Example 18995
Unit MW

EMBEDDED_WIND_GENERATION

Title Estimated Embedded Wind Generation
Type integer
Description This is an estimate of the GB wind generation from wind farms which do not have Transmission System metering installed. These wind farms are embedded in the distribution network and invisible to National Grid ESO. Their effect is to suppress the electricity demand during periods of high wind. The true output of these generators is not known so an estimate is provided based on National Grid ESO’s best model.
Comment
Example 2815
Unit MW

EMBEDDED_WIND_CAPACITY

Title Embedded Wind Capacity
Type integer
Description This is National Grid ESO’s best view of the installed embedded wind capacity in GB. This is based on publicly available information compiled from a variety of sources and is not the definitive view. It is consistent with the generation estimate provided above.
Comment
Example 6545
Unit MW

EMBEDDED_SOLAR_GENERATION

Title Estimated Embedded Solar Generation
Type integer
Description This is an estimate of the GB solar generation from PV panels. These are embedded in the distribution network and invisible to National Grid ESO. Their effect is to suppress the electricity demand during periods of high radiation. The true output of these generators is not known so an estimate is provided based on National Grid ESO’s best model.
Comment
Example 0
Unit MW

EMBEDDED_SOLAR_CAPACITY

Title Embedded Solar Capacity
Type integer
Description As embedded wind capacity above, but for solar generation.
Comment
Example 15005
Unit MW

NON_BM_STOR

Title Non-Balancing Mechanism Short-Term Operating Reserve
Type integer
Description For units that are not included in the ND generator definition. This can be in the form of generation or demand reduction.
Comment
Example 0
Unit MW

PUMP_STORAGE_PUMPING

Title Pump Storage Pumping
Type integer
Description The demand due to pumping at hydro pump storage units; the -ve signifies pumping load.
Comment
Example 1161
Unit MW

SCOTTISH_TRANSFER

Title Scottish Transfer Volume
Type integer
Description The volume of power flowing from Scotland to England and Wales. Negative values denote a flow from England and Wales to Scotland.
Comment
Example 1194
Unit MW

IFA_FLOW

Title IFA Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 609
Unit MW

IFA2_FLOW

Title IFA2 Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 903
Unit MW

BRITNED_FLOW

Title Britned Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example -896
Unit MW

MOYLE_FLOW

Title Moyle Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example -451
Unit MW

EAST_WEST_FLOW

Title East West Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example -529
Unit MW

NEMO_FLOW

Title Nemo Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 253
Unit MW

NSL_FLOW

Title North Sea Link Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 235
Unit MW

ELECLINK_FLOW

Title ELECLINK Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 998
Unit MW

VIKING_FLOW

Title Viking Interconnector Flow
Type integer
Description The flow on the respective interconnector. -ve signifies export power out from GB; +ve signifies import power into GB.
Comment
Example 0
Unit MW