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close this bookWorld Energy Assessment - Energy and the Challenge of Sustainability - Overview (UNDESA - UNDP - WEA - WEC, 2000, 42 p.)
View the document(introduction...)
View the documentForeword
View the documentPreface
View the documentAcknowledgements
View the documentEditorial board
View the documentEstablishing institutions
close this folderWorld Energy Assessment Overview
View the documentIntroduction
View the documentPart 1. Energy and major global issues
View the documentPart 2. Energy resources and technological options
View the documentPart 3. Are sustainable futures possible?
View the documentPart 4. Where do we go from here?
View the documentAnnex: Energy units, conversion factors, and abbreviations
View the documentORDER FORM

Annex: Energy units, conversion factors, and abbreviations

To:

Terajoule
(TJ)

Gigacalorie
(Gcal)

Megatonne oil (equiv)
(Mtoe)

Million British thermal units
(Mbtu)

Gigawatt-hour
(GWh)

From:

Multiply by:





Terajoule (TJ)

1

238.8

2.388 x 10-5

947.8

0.2778

Megatonne oil (equiv) (Mtoe)

4.1868 x 104

107

1

3.968 x107

11,630

Million British thermal units (Mbtu)

1.0551 x 10-3

0.252

2.52 x 10-8

1

2.931 x 10-4

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

k

kilo(103)

M

mega(106)

G

giga(109)

T

tera (1012)

P

peta (1015))

E

exa (1018)

TABLE A 3. ASSUMED EFFICIENCY IN ELECTRICITY GENERATION (FOR CALCULATING PRIMARY ENERGY)

Type of power

Assumed efficiency

Nuclear power

.33

Hydroelectric

1.00

Wind and solar

1.00

Geothermal

.10

TABLE A 4. ABBREVIATIONS

CO2

Carbon dioxide

H2

Hydrogen

kWh

Kilo Watt hour

GWe

Giga Watt electricity

GWth

Giga Watt thermal

MWe

Mega Watt electricity

TWh

Tera Watt hour

GJ

Giga joule

PJ

Peta joule