Energy statistics: explanatory notes
General
More detailed notes on the methodology used to compile the figures and data sources are included in the annual Digest of United Kingdom Energy Statistics (DUKES).
Notes to tables
Figures for the latest periods and the corresponding averages (or totals) are provisional and are liable to subsequent revision.
The figures have not been adjusted for temperature or seasonal factors except where noted.
Due to rounding the sum of the constituent items may not equal the totals.
Percentage changes relate to the corresponding period a year ago. They are calculated from unrounded figures but are shown only as (+) or (-) when the percentage change is very large.
Monthly figures relate to four week periods except in the Gas and Petroleum sections where they relate to calendar months.Quarterly figures relate to thirteen week periods except in the Gas and Petroleum sections where they relate to calendar quarters.
All figures relate to the United Kingdom unless otherwise indicated.
Abbreviations
For a full list see Annex B of DUKES.
- CCGT - Combined Cycle Gas Turbine
- LRP – Lead Replacement Petrol
- ATF – Aviation Turbine Fuel
- NGLs - Natural gas liquids
- UKCS - United Kingdom Continental Shelf
- GVA – Gross Value Added
- MSF – Manufactured Solid Fuels
Symbols used in the tables
.. not available.
- nil or less than half the final digit shown.
* five-week period.
p provisional.
r revised; where a column or row shows 'r' at the beginning, most, but not necessarily all, of the data have been revised.
e estimated; totals of which the figures form a constituent part are there-
fore partly estimated.
Conversion factors
- 1 tonne of UK crude oil = 7.55 barrels
- 1 tonne = 1,000 kilograms
- 1 gallon (UK) = 4.54609 litres
- 1 kilowatt (kW) = 1,000 watts
- 1 megawatt (MW) = 1,000 kilowatts
- 1 gigawatt (GW) = 1,000 megawatts
- 1 terawatt (TW) = 1,000 gigawatts
All conversion of fuels from original units to units of energy is carried out on the basis of the gross calorific value of the fuel. More detailed information on conversion factors and calorific values is given in Annex A of the Digest of United Kingdom Energy Statistics.
Conversion matrices
To convert from the units on the left hand side to the units across the top multiply by the values in the table:
| From: | To: multiply | |||
Thousand toe | Terajoules | Gigawatt hours | Million therms | |
|---|---|---|---|---|
| Thousand tonne of oil equivalent | 1 | 41.868 | 11.630 | 0.39683 |
| Terajoules (TJ) | 0.023885 | 1 | 0.27778 | 0.0094778 |
| Gigawatt hours (GWh) | 0.085985 | 3.6000 | 1 | 0.034121 |
| Million therms | 2.5200 | 105.51 | 29.307 | 1 |
| From: | To: multiply | |||
Tonnes of oil equivalent | Gigajoules | Kilowatt hours | Therms | |
|---|---|---|---|---|
| Tonnes of oil equivalent | 1 | 41.868 | 11,630 | 396.83 |
| Gigajoules (GJ) | 0.023885 | 1 | 277.78 | 9.4778 |
| Kilowatt hours (kWh) | 0.000085985 | 0.003600 | 1 | 0.034121 |
| Therms | 0.0025200 | 0.105510 | 29.307 | 1 |
Sectoral breakdowns
The categories for final consumption by user are defined by the Standard Industrial Classification 2003, as follows:
Fuel producers 10-12, 23, 40
Final consumers:
- Iron & Steel 27, excluding 27.4, 27.53, 27.54
- Non-ferrous metals, 27.4, 27.53, 27.54
- Mineral Products 14, 26
- Chemicals 24
- Mechanical engineering and metal products 28, 29
- Electrical and instrument engineering 30, 31, 32, 33
- Vehicles 34, 35
- Food, beverages & tobacco 15,16
- Textiles, clothing, leather, & footwear 17-19
- Paper, printing & publishing 21,22
- Other industries 13, 20, 25, 36, 37, 41
- Construction 45
- Transport & Storage 60-63
Other final users:
- Agriculture 01, 02, 05
- Commercial 50-52, 55, 64-67, 70-74
- Public Administration 75, 80, 85
- Miscellaneous 90-93, 99
- Domestic Not covered by SIC 2003