**Bcf**– One billion cubic feet, a common measure of natural gas (see Cubic Foot).

**British Thermal Unit (Btu)**– The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a specified temperature. When it comes to natural gas, Btu’s are divided into “dry” and “saturated.” Natural gas that is moisture-free, or that contains less than seven pounds of water vapor per Mcf, is measured in dry Btu’s; when natural gas is fully saturated with water vapor, under standard temperature, pressure and gravity conditions, it is measured in saturated Btu’s.

**Cubic Foot**– The standard size of a New York apartment closet. Well, okay, it’s a measure of natural gas volume, referring to the amount of gas needed to fill one cubic foot at standard atmospheric pressure and 60 degrees Fahrenheit. A cubic foot of gas contains approximately 1,000 Btu’s, which is enough gas to boil a heckuva big pot of water.

**Gigajoule**– A unit of energy that equals 943,213.3 Btu’s. That’s enough gas to heat up a bigger bunch of water, like maybe a swimming pool.

**Mcf**– One thousand cubic feet, generally of natural gas (see Cubic Foot).

**MMBtu**– One million British thermal units (Btu’s), also known as one dekatherm. It is equal to approximately 1,000 cubic feet of natural gas — enough energy to bring 800 gallons of water to a boil, or heat up 12,800 cups of coffee. In teaspoons…oh, never mind!

**Mmcf**– One million cubic feet, usually of natural gas.

**Quad**– One quadrillion British thermal units (Btu’s), or the energy equivalent of 170 million barrels of oil. In a typical year, the United States uses an average of 83 quads.

**Therm**– A unit of heating value equal to 100,000 Btu’s.

#### Electric Measurement Terms

**Gigajoule**– A unit of energy that equals 943,213.3 Btu’s.

**Gigawatt (GW)**– One billion watts. Gigawatt-hour (GWh) – One billion watt-hours.

**Joule**– A measure of energy equal to one watt-second, or one watt of power supplied to, or taken from, an electrical circuit steadily for one second.

**Kilovolt (kV)**– Electrical potential equal to 1,000 volts. Most car batteries are 12-volt, so 1 kV is the juice that could be produced by 83.3 car batteries.

**Kilowatt (kW)**– A unit of electric power equal to 1,000 watts. One kilowatt can light up ten 100-watt light bulbs.

**Kilowatt-hour (kWh)**– The basic unit for pricing electricity. A kilowatt-hour is equivalent to one kilowatt of power used for one hour. That’s enough juice to run an average home for a day, give or take shutting off an air conditioner or two. It equals 1,000 watt-hours and is the equivalent of 3,412 Btu’s of energy.

**Megawatt (MW)**– One thousand kilowatts. One megawatt-hour is enough power to service 1,000 homes for about one day.

**Watt**– The basic unit for measuring volume of electricity. Technically, it’s the power produced by a current of one ampere across a potential difference of one volt. For those who care, there are at least 135,000 ways to scientifically or mathematically define potential difference.

- Gigawatt (GW) – One billion watts.
- Gigawatt-hour (GWh) – One billion watt-hours.
- Kilowatt (kW) – A unit of electrical power equal to 1,000 watts.
- Kilowatt-hour (kWh) – The basic unit for pricing electricity, a kilowatt-hour is equivalent to one kilowatt of power used for one hour.
- Megawatt (MW) – A megawatt equals 1,000 kilowatts.
- Terawatt-hours (TWh) – Equal to 1,000 gigawatt-hours, the ter-awatt is a commonly used energy yardstick in Europe.
- Watt-hour (Wh) – One watt of power supplied to or taken from a circuit for one hour.

*This glossary of Gas & Electric terms has been provided by **Aquila**.