1cf equals one cubic foot - a measurement typically used to describe natural gas volumes as in reserves, deliveries, storage levels, etc.

Mcf equals one thousand cubic feet - the typical unit by which natural gas is bought and sold (e.g. The spot price of natural gas is $5.40 per Mcf)

MMcf equals one million cubic feet

Bcf equals one billion cubic feet

Tcf equals one trillion cubic feet

1cf contains ~ 1027 Btu's - the energy content of natural gas varies according to its specific composition. 1027 represents an average.

Btu equals British Thermal Unit - a measure of energy content. The amount of energy required to increase the temperature on one pound of water one degree under Standard (defined) conditions.

Therm equals one hundred thousand Btu's

Dekatherm equals one million Btu's

w equals watt - a measure of electrical energy

Kw equals Kilowatt - one thousand watts

Kw-hr equals Kilowatt-hours - number of kilowatts per hour. Ten 100w light bulbs burning for one hour is the equivalent of 1 Kw-hr

1 Kw-hr contains 3413 Btu's

hp equals Horsepower - a measure of mechanical energy. One horsepower equals 550 foot-pounds per second.

1 hp equals 746 watts

hp-hr equals Horsepower-hours

1hp-hr equals 2545 Btu's