A 
AC  Alternating
current. An electric current that reverses its direction
of flow periodically as contrasted to direct current (DC).

AMP  Ampere.
The measure of the number of electrons flowing past a
given point in an electrical conductor in a given amount
of time; this is the electrical current.



B 
Bbl  Barrel.
A volumetric unit of measure for crude oil and petroleum
products equivalent to 42 U.S. gallons.

Bcf  Billion
cubic feet

Btu  British
thermal unit. One Btu is the quantity of heat required
to raise the temperature of one pound of water one degree
Fahrenheit. (one Btu = 1055 Joules)



C 
Ccf  A unit
of measurement for natural gas and water. Short for hundred
cubic feet. Used to record the water use of a customer
in a billing period. 1 CCF = 748 gallons.

Celsius  A
temperature scale that registers the freezing point of
water at 0° and the boiling point as 100° under
normal atmospheric conditions.

Cf  Cubic foot.
The most comon measurement of gas volume. The amount of
gas required to fil a volume of one cubic foot under stated
conditions of temperature and pressure and can be measured
in thousands, millions, billions or trillions.



D 
DC  Direct
current. Electricity that flows continuously in one direction
as contrasted with alternating current (AC).

Dth  Dekatherm.
A unit of heat equal to 10 Therms or one million Btu's.



E 
EHV  Extra
high voltage. Generally any voltage of 345,000 volts or
higher. Giga One billion



F 
Fahrenheit



G 
gW  Gigawatt.
One thousand megawatts (1,000 MW), or one million kilowatts
(1,000,000 kW), or one billion watts (1,000,000,000 watts)
of electricity.

gWh  Gigawatthour
is equal to one million KWH.

GJ  GigaJoules



H 
Heat Rate 
A measure of generating station thermal efficiency, generally
expressed in Btu per net kilowatthour. Computed by dividing
the total Btu content of fuel burned for electric generation
by the resulting net kilowatthour generation.

Hertz  The
frequency with which an alternating current waveform rises
and falls (changes polarity).



I 
No Listing at this time



J 
Joule  (kJ+MJ):
A unit of measurement of energy equal to a wattsecond.
kJ represents a kilojoule (1,000 joules); 1055 Joules
is equal to 1 BTU.



K 
Kilo  Prefix
used to denote 1,000 units

Kilowatthours Per Capita
 Net generation in the U.S. divided by national population,
or the corresponding ratio for any other area.

Kvar  Kilovar.
1,000 reactive voltamperes

kV  KiloVol.
Unit of electric potential equal to 1,000 volts

KVA  Kilovoltampere;
the unit used to express apparent power. A unit of measure
for power consumption used for equipment that is not resistive
such as motors, computers, and most nonincandescent lighting.

kW  Kilowatt

kWh  Kilowatt
hour



L 
No listing at this time



M 
Mbbl  Thousand
barrels

Mcf  One thousand
cubic feet

Mega  Prefix
used to denote 1,000,000 units.

Mgal  1000
gallons. Unit of measurement used to record the water
use of a customer in a billing period.

MMcf  One million
cubic feet

MMDt  One trillion
Btu's or equivalent to a Bcf (millio Mcf)

MW  Megawatt.
One megawatt equals one million watts.

MWe  Megowatts
of electric power

MWh  Megawatt
hour

MWth  Megawatts
of thermal power



N 
No listing at this time



O 
Ohm  Unit of
measurement of electrical resistance. The resistance of
a circuit in which a potential difference of 1 volt produces
a current of 1 ampere.



P 
Peak Watt 
A manufacturer's unit indicating the amount of power a
photovoltaic cell or module will produce at standard test
conditions (normally 1,000 watts per square meter and
25 degrees celsius).

Perm  The measurement
of water vapor through different materials measured in
perminch (mass of water vapor moving through a unit area
in unit time).

ppm  Parts
per million

ppmv  Parts
per million by volume

psia  Pressure,
pounds per square inch (absolute)

psig  Pressure,
pounds per square inch (gauge)



Q 
Quad  Unit
of energy of 1 quadrillion British thermal units

Quadrillion Btu
 Equivalent to 10 to the 15th power Btu (1015 Btu)



R 
No listing at this time



S 
Short Ton 
A unit of weight equal to 2,000 pounds



T 
Tcf  A trillion
cubic feet of natural gas, equivalent in energy content
to 1.03 quads.

Therm  A unit
equal to 100,000 Btu's.

Trillion Cubic Foot
 A volume measurement of natural gas approximately equivalent
to one Quad.



U 
No listing at this time



V 
Var  Unit of
reactive power

Volt  Unit
of electromotive force, analogous to water pressure in
pounds per square inch.

Voltage  The
"pressure" of electrical flow.

vol%  Percent
by volume



W 
Watt (Electric)
 Measure of total electrical output. Watts = Volts x
Amps

Watt (Thermal)
 A unit of power in the metric system expressed in terms
of energy per second, equal to the work done at a rate
of 1 joule per second.

Wavelength 
The distance between two successive peaks of a waveform.
For example, waves in the sea may be spaced about 100m
apart; wavelength is therefore about 100m.

Wh  Watthour.
Electrical energy unit of measure equal to 1 watt of power
supplied to, or taken from, an electric circuit steadily
for 1 hour.

wt%  Percent
by weight



X 
No Listing at this time



Y 
No Listing at this time



Z 
No Listing at this time


