Data and Data Manipulation FAQ

 

Where can I get information on energy use? (Source data, time-series, graphs & charts)

It is most likely that the information you require is available on the databank hosted for SEAI on the CSO web pages. Click here for instructions on how to download data from the databank.

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How do I use the databank?

You can access the databank hosted by the CSO from here.  

For example Fuel consumption (ktoe) by Sector, Year and Fuel type. 

Please note that the units are in kilo-tonnes of oil equivalent. You will need to apply conversion figures to get your desired units. You can then download the data or charts as you choose.

Click here to find out how to navigate to statistics section from the homepage.

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Ireland’s Energy Balance – What is it? Where can I get the data? When is it available?

The energy balance is the presentation of energy statistics expressed in energy units in the form of commodity balances between the supply and use of energy commodities.

The latest energy balance is available here.

Annual surveys are sent out in year t for energy used in the year t-1. A provisional energy balance for year t-1 is released at the end of March every year. All responses are gathered by September of year t which means that the balance for year t-1 can be finalised in October of year t.

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What is a kilo-tonne of oil equivalent?

A kilo-tonne of oil equivalent is a thousand (103) tonnes of oil equivalent. A tonne of oil equivalent is a conventional standardised unit of energy and is defined on the basis of a tonne of oil having a net calorific value of 41686kJ/kg. A related unit is the kilogram of oil equivalent (kgoe) where 1kgoe = 10-3 toe.

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How do I convert between different energy units? What conversion factors do you use?

The International Energy Agency (IEA) has an on-line conversion tool. Click on the following link:

http://www.iea.org/stats/unit.asp

Alternatively use the following table:

To:toeMWhGJ
From:Multiply by
toe111.6341.868
MWh0.08613.6
GJ0.023880.27781

Energy Units:

joule (J): Joule is the international (S.I.) unit of energy. 

kilowatt hour (kWh): The conventional unit of energy that electricity is measured and charged for commercially.

tonne of Oil Equivalent (toe): This is a conventional standardized unit of energy and is defined on the basis of a tonne of oil having a net calorific value of 41686 kJ/kg. A related unit is the kilogram of oil equivalent (kgoe), where 1 kgoe = 10-3 toe.

Decimal Prefixes

deca (da)101deci (d)10-1
hecto (h)102centi (c)10-2
kilo (k)103milli (m)10-3
mega (M)106micro (m)10-6
giga (G)109nano (n)10-9
tera (T)1012pico (p)10-12
peta  (P)1015femto (f)10-15
exa (E)1018atto (a)10-18

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What fuel densities do you use?

 Density
 Litres/tonne
Kerosene1250
Crude Oil1067
Gasoline(Petrol)1350
Diesel /Gasoil1183
Heavy Fuel Oil1062
LPG*1915
Biodiesel1136
Bioethanol1250
Pure Plant Oil1087
  
*Assumes a mixture of 70% propane & 30% butane by mass

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What net calorific values do you use?

 toe/tonnekWh/litre
Kerosene1.05569.821
Crude Oil1.022611.146
Gasoline(Petrol)1.06509.175
Diesel /Gasoil1.034410.169
Heavy Fuel Oil0.984910.786
LPG1.12636.840
Biodiesel0.89019.113
Bioethanol0.63285.888
Pure Plant Oil0.88259.442

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What are the emissions per unit of energy for specific fuels?

 tCO2/TJgCO2/kWhtCO2/toe
Liquid fuels   
Gasoline70.0251.92.931323
Jet Kerosene71.4257.02.98995
Other Kerosene71.4257.02.98995
Gas/Diesel Oil73.3263.93.069514
Residual Oil76.0273.63.18258
LPG63.7229.32.667504
Naphta73.3264.03.069514
Petroleum Coke92.9334.53.891541
    
Solid Fuels & Derivatives   
Coal94.6340.63.961474
Milled Peat116.7420.04.886935
Sod Peat104.0374.44.355109
Peat Briquettes98.9355.94.141541
    
Gas   
Natural Gas*56.9204.72.382747
    
Electricity *   
2014126.9456.65.3103

* Varies annually.

The emission factor for electricity depends on the electricity generation mix in any particular year. The SEAI emission factors for electricity are calculated from the generator inputs (public thermal plants and CHP units) thus inherently including any generator own use electricity and system losses (transmission and distribution). The electricity emission factor may differ from than that produced by the Commission for Energy Regulation (CER) and Eirgrid depending on whether the figures quoted use gross or net electricity generation and also whether or not CHP is included.

The gas figure depends on the mix of imported and indigenous gas used for any particular year. The Environmental Protection Agency (EPA) provides the natural gas emissions fact to SEAI.

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How much emissions are there from electricity use? (CO2 g/kWh)

This figure changes annually as it depends on the final generation mix that was used in any particular year. In 2014 electricity produced 457 g/kWh of CO2

Historical values are available online

Online direction from the SEAI webpage:

Once on the SEAI statistics landing page, click on “Emission Factors” from the menu on the left hand side. Then click on the historical electricity emission factor file underneath the table. 

The emission factor for electricity depends on the electricity generation mix in any particular year. The SEAI emission factors for electricity are calculated from the generator inputs (public thermal plants and CHP units) thus inherently including any generator own use electricity and system losses (transmission and distribution). The electricity emission factors may differ from than that produced by the Commission for Energy Regulation (CER) and Eirgrid depending on whether the figures quoted use gross or net electricity generation and also whether or not CHP is included.

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How much CO2 is avoided by wind turbines or other renewable energy sources?

This figure changes annually as it depends on the final generation mix that was used in any particular year. In 2008 wind energy and other renewables avoided 515 g/kWh. This figure assumes zero carbon emissions from the renewables and excludes any other lifecycle emissions there may be from the manufacturing stage of the renewable energy. Please refer to the latest Renewable Energy in Ireland report for details on the methodology used to calculate the avoided emissions from Renewable Energy. 

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