Methodology the source data from National Grid and Elexon is translated into figures: EIR release

Information request and response under the Environmental Information (Scotland) Regulations 2004.

Information requested

For both of the below data sets, sourced from Scot Gov’s Scottish Energy Statistics Hub, please provide the methodology by which the source data from National Grid and Elexon is translated into the figures reported by Scot Gov.

  1. Proportion of electricity consumption by fuel ( Section=RenLowCarbon&Subsection=RenElec&Chart=ElecConsumptionFuel)
  2. Scottish generation meeting demand ( Section=SystemSecurity&Chart=ScotGenDemand)

As the information you have requested is 'environmental information' for the purposes of the Environmental Information (Scotland) Regulations 2004 (EIRs), we are required to deal with your request under those Regulations. We are applying the exemption at section 39(2) of the Freedom of Information (Scotland) Act 2002 (FOISA), so that we do not also have to deal with your request under FOISA. This exemption is subject to the 'public interest test'. Therefore, taking account of all the circumstances of this case, we have considered if the public interest in disclosing the information outweighs the public interest in applying the exemption. We have found that, on balance, the public interest lies in favour of upholding the exemption, because there is no public interest in dealing with the same request under two different regimes. This is essentially a technical point and has no material effect on the outcome of your request.


  1. The proportion of electricity consumption by fuel percentages are sourced using the National Grid Carbon intensity API ( The data is an estimate of the amount of CO2 emitted per kilowatt hour of electricity consumed by fuel type. This is provided on a half hourly basis and we then summarise and group the data to show this on a quarterly basis.

    Wind, Hydro, Bioenergy and Waste, and Solar fuel sources are grouped together in the “renewables” category. The “Low Carbon” category includes all those included in “renewables” with the addition of Nuclear.

    The half hourly data is summed up to give a total for each technology by quarter and year and is then divided by the total for all technologies to give us the percentages presented on the hub.
Quarter Biomass Coal Gas Hydro Imports Nuclear Solar Wind Renewables Low carbon Total
2022 Q1 123062 3465 1118605 1039687 251966 1950690 69035 7626151 8857935 10808625 12182918
2022 Q2 142029 142 2368811 670827 228753 2101879 167314 5725728 6705899 8807778 11405761
2022 Q3 183971 1011 2573496 537368 165502 1770041 177972 5463547 6362858 8132898 10872826
2022 Q4 152320 1320 1308317 1123518 317737 2170880 33170 7627734 8936742 11107622 12735366
2022 Q1-Q4 601382 5938 7369229 3371400 963958 7993490 447490 26443160 30863434 38856923 47196870
Proportion of CO2 consumption 1.3% 0.0% 15.6% 7.1% 2.0% 16.9% 0.9% 56.0% 65.4% 82.3% 100.0%
  1. There is a license agreement in place between Strathclyde University and Elexon, providing access to their data feeds on an annual subscription basis.

    We receive the Elexon generation data from Strathclyde University, the data includes the amount of electricity generated every half hour in MW by fuel type. We get historic half hourly demand data from the National Grid data portal ( The generation data and the demand data are then grouped by quarter and year.

    To calculate the proportion of time the total demand is met by electricity generated by fuel type for the year, the number of half hourly periods where electricity generation exceeds demand is divided by the total number of half hourly periods in the year:

    Percentage of time where generation > demand = (number of periods where generation > demand) / (total number of periods).

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