 | World Energy Assessment - Energy and the Challenge of Sustainability - Overview (UNDESA - UNDP - WEA - WEC, 2000, 42 p.) |
 |  | World Energy Assessment Overview |
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Annex: Energy units, conversion factors, and abbreviations
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To: |
Terajoule |
Gigacalorie |
Megatonne oil (equiv) |
Million British thermal units |
Gigawatt-hour |
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From: |
Multiply by: |
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Terajoule (TJ) |
1 |
238.8 |
2.388 x 10-5 |
947.8 |
0.2778 |
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Megatonne oil (equiv) (Mtoe) |
4.1868 x 104 |
107 |
1 |
3.968 x107 |
11,630 |
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Million British thermal units (Mbtu) |
1.0551 x 10-3 |
0.252 |
2.52 x 10-8 |
1 |
2.931 x 10-4 |
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Gigawatt-hour (GWh) |
3.6 |
860 |
8.6 x 10-5 |
3,412 |
1 |
* IEA figures. Additional conversion figures available at http://www.iea.org/stat.htm
TABLE A 2. UNIT PREFIXES
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k |
kilo(103) |
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M |
mega(106) |
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G |
giga(109) |
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T |
tera (1012) |
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P |
peta (1015)) |
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E |
exa (1018) |
TABLE A 3. ASSUMED EFFICIENCY IN ELECTRICITY GENERATION (FOR CALCULATING PRIMARY ENERGY)
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Type of power |
Assumed efficiency |
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Nuclear power |
.33 |
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Hydroelectric |
1.00 |
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Wind and solar |
1.00 |
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Geothermal |
.10 |
TABLE A 4. ABBREVIATIONS
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CO2 |
Carbon dioxide |
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H2 |
Hydrogen |
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kWh |
Kilo Watt hour |
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GWe |
Giga Watt electricity |
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GWth |
Giga Watt thermal |
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MWe |
Mega Watt electricity |
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TWh |
Tera Watt hour |
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GJ |
Giga joule |
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PJ |
Peta joule |
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