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Natural Gas FAQ (Frequently Asked Questions)
Natural gas found in the ground contains methane, ethane, propane, pentane, and traces of hexane and heptane. Gas utilities remove almost everything but the methane so the natural gas delivered to your home will burn cleanly.
Methane is a molecule made up of one carbon atom and four hydrogen atoms. Its chemical formula is CH4.
The main products released when natural gas is burned are carbon dioxide and water vapor. Coal and oil are more chemically complex than natural gas, so when burned, they release a variety of potentially harmful chemicals into the air.
Natural gas supplies about 28% of all energy used in the United States.
(Source: U.S. Energy Information Administration)
More homes in the U.S. are heated by natural gas than by electricity.
Natural gas is found in 33 states. The dark blue states on this map show you where large amounts of natural gas are extracted. In the medium blue states, moderate amounts of natural gas are extracted. And in the light blue states, just a little natural gas is extracted. Natural gas is not extracted at all in the white states.
Natural gas is found in about 50 countries. About 3,868 billion cubic meters of natural gas was taken out of the ground and processed for use in 2018. Here is a breakdown of how much of that was produced by various countries and regions:
- Europe and Eurasia 28%
- United States 21.5%
- Asian and Pacific Countries 16.3%
- Middle East 17.8%
- Africa 6.1%
- Canada 4.8%
- Central and South America 4.6%
- Mexico 1%
(Source: BP Statistical Review of World Energy 2019)
About 3,156 billion cubic meters of natural gas was used in the world in 2018. Here is a breakdown of how much of that was used by various countries and regions:
- Europe and Eurasia 29.4%
- United States 21.2%
- Asian and Pacific Countries 21.4%
- Middle East 14.4%
- Central and South America 4.4%
- Africa 3.9%
- Canada 3%
- Mexico 2.3%
(Source: BP Statistical Review of World Energy 2019)
If natural gas production continues throughout the world at the level it did in 2017, the world’s known gas reserves are expected to last about 52.6 years.
(Source: BP Statistical Review of World Energy 2018)
In the 1970s and 1980s, most electric power plants were fueled by coal or nuclear power. But due to environmental concerns, by the 1990s, about 60 percent of new electric power plant capacity was fueled by natural gas. Because it is a clean-burning, competitively priced, and efficient fuel, the use of natural gas to generate electricity has increased dramatically during the last decade.
(Source: American Gas Association)
About 2.5 million miles of underground pipelines deliver natural gas to about 68 million customers in the U.S.
(Source: American Gas Association)
The first widespread use of gas energy in the United States occurred in 1816, when gaslights illuminated the streets of Baltimore, Maryland.
In its natural state, natural gas has no odor. Utility companies add a chemical odorant called “mercaptan” to natural gas to help make gas leaks easier to notice. If you have a natural gas stove, you may have smelled this rotten egg odor when the pilot light has gone out.
When natural gas is cooled to 260 degrees below zero, it changes from a gas into a liquid. Liquid natural gas takes up much less space than natural gas, making it easy to transport and convenient to store. Six hundred cubic feet of natural gas turns into just one cubic foot of liquid gas!
A smart pig is an electronic device that can be used to inspect the insides of natural gas pipelines. The device travels through a pipeline and transmits images of the inside of the pipeline so inspectors can tell if the pipeline needs repairs.
Natural gas travels through high-pressure transmission pipelines at up to 30 miles per hour.
Vehicles that run on natural gas instead of gasoline are called natural gas vehicles (NGVs). There are about 175,000 NGVs on U.S. roads today and more than 23 million worldwide. NGVs are a popular transportation choice because they run cleaner than other vehicles. Compared to gasoline- or diesel-powered vehicles, they produce much lower levels of pollutants and cost less to maintain. Also, natural gas costs less than conventional gasoline at the pump.
Natural gas is called “natural” because when this type of gas was first discovered, it could be used directly from the ground in its natural state, without any processing. Today, gas utilities process natural gas by removing water, sand, and other compounds so that when the gas is delivered to your home, it will burn as cleanly and efficiently as possible. And in its natural state gas has no odor. That’s why gas utilities add a harmless but stinky chemical called mercaptan; the odor helps people smell a leak that otherwise, in the gas’s natural state, doesn’t smell.
The Chinese discovered natural gas in 600 BC, but it wasn’t until the 1950s that natural gas pipelines were built for widespread use of natural gas in the United States. Here’s what happened in between.
First Recorded Use of Natural Gas
The ancient Chinese were the first to discover underground deposits of natural gas. In 600 BC, Confucius wrote of wells 100 feet deep yielding water and natural gas along the Tibetan border. The Chinese piped the gas to where it was needed through long, hollow bamboo poles.
First Use of Natural Gas in the Home
The first recorded use of natural gas in the home was in Persia (now Iran) around the first century AD. Natural gas seeped out of the ground and was ignited by lightning, producing a hot flame that burned continuously, day and night. The King of Persia decided to take advantage of this “eternal flame.” But instead of having the gas piped to his home—like we do today—he built his royal kitchen near the flame.
Natural Gas Use in America
Natural gas usage was identified in America as early as 1626, when French explorers found Native Americans igniting gases that were seeping into and around Lake Erie.
Natural Gas Street Lights
For most of the 1800s, natural gas was used as a fuel for lamps. There were no pipelines to bring gas into individual buildings, so most of the gas went to light city streets. After the 1890s, cities began using electricity for their streetlights, so gas producers began searching for new uses for their product.
First Natural Gas Well in U.S.
In 1821, a gunsmith named William Hart drilled the first natural gas well outside Fredonia, New York, near Lake Erie. He dug down 27 feet. (Today’s wells go down more than 30,000 feet!) Hart is considered by many to be the “father of natural gas” in the United States. In 1858, he formed the Fredonia Gas Light Company, the nation’s first natural gas company.
First Natural Gas Pipeline in U.S.
In 1859, Colonel Edwin Drake drilled a 69-foot well in Pennsylvania that struck natural gas and oil. Later, a 5½-mile-long, 2-inch-diameter pipeline was constructed, running from the well to the town of Titusville. Many consider this first gas transportation pipeline to be the start of the natural gas industry in this country.
First Gas Burners
Ever heard of a Bunsen burner? Robert Bunsen was a German scientist who made popular a burner that mixed air with natural gas, thus allowing the natural gas flame to be regulated. This made it more convenient to use natural gas for heating buildings and cooking.
1940s to Present
Widespread Construction of Gas Pipelines
Improvements in metals, pipe making, and welding techniques during World War II made pipeline construction more economically attractive. After the war, the nation began building its pipeline network. In the 1950s and 1960s, thousands of miles of natural gas pipeline were constructed throughout the United States. Today, this interstate pipeline system contains over one million miles of pipe—enough to stretch to the moon and back twice.
Natural Gas Vehicles
Vehicles that run on natural gas instead of gasoline are called natural gas vehicles (NGVs). There are about 112,000 NGVs on our nation’s roads today and over 13 million worldwide. More than 30 different manufacturers produce NGVs.
Many passenger vehicles are available today that run on natural gas that has been compressed into special high-pressure cylinders to get more volume into a smaller amount of space (called compressed natural gas, or CNG). CNG is available at special fueling stations.
Some vehicles run on CNG only, and others can run on either CNG or gasoline; these are called bi-fuel vehicles. Some long-haul trucks and transit buses run on a different form of natural gas called liquefied natural gas, or LNG, which is made by refrigerating natural gas to condense it into a liquid.
The liquid form is much more dense than natural gas or CNG, and thus has much more energy for the amount of space it takes up. So, more energy can be stored in the same amount of space on a car or truck. That means LNG is good for large trucks that need to go a long distance before they stop for more fuel.
Here is how NGVs work:
- NGVs burn natural gas that is compressed and stored in cylinders.
- When the engine is started, natural gas flows into a fuel line.
- The gas then enters a regulator where its pressure is reduced.
- The natural gas feeds into the engine through a fuel injection system where it’s combined with air. The fuel-air mixture is adjusted to burn most efficiently and with the least possible emissions.
- Natural gas burns in the engine just like gasoline.
- NGVs can be refueled by attaching a hose at the fueling point.
NGVs are a popular transportation choice because they run cleaner than other vehicles. Compared to gasoline- or diesel-powered vehicles, they produce much lower levels of pollutants and cost less to maintain. Also, natural gas costs, on average, one-third less than conventional gasoline at the pump. The tanks used to store natural gas can withstand crashes and heat far better than most gasoline tanks can. In the event of a crash, natural gas disperses into the air, whereas gasoline pools on the ground, creating a fire hazard.
Natural Gas Careers
These mapping scientists use aerial photos to make drawings of the earth’s surface and subsurface. They use Global Positioning System (GPS) technology, which relies on satellites to send radio signals to special instruments on the earth’s surface. The instruments, which receive signals from several satellites simultaneously, help photogrammetrists draw the most accurate picture possible. Geophysical prospecting surveyors help photogrammetrists develop maps to help locate natural gas deposits.
These engineers analyze the patterns that result as sound waves are forced deep into the earth. The way the sound waves bounce back reflects rock formations that are likely to hold natural gas.
These engineers search the world for reservoirs containing oil or natural gas. Once these are discovered, petroleum engineers work with geologists and other specialists to understand the geologic formation and properties of the rock containing the reservoir, determine the drilling methods to be used, and monitor drilling and production operations. They design equipment and processes to achieve the maximum profitable recovery of oil and natural gas. Petroleum engineers rely heavily on computer models to simulate the effects of various drilling options.
Rotary drilling crews usually consist of four or five workers who operate large machinery involved in drilling for natural gas. Rotary drillers supervise the crew and operate machinery that controls drilling speed and pressure. Rotary-driller helpers guide the lower ends of pipe to well openings and connect pipe joints and drill bits. Rotary-rig engine operators are in charge of engines that provide the power for drilling and hoisting. Derrick operators work on small platforms high on rigs to help run pipe in and out of well holes and operate the pumps that circulate mud through the pipe.
Natural Gas Processing Workers
Most workers involved in natural gas processing are equipment operators. Wellhead pumpers operate power pumps and auxiliary equipment to produce the flow of oil or natural gas from wells in oil fields. Gas treaters tend automatically controlled treating units that remove water and other impurities from natural gas. Gas compressor and gas pumping station operators operate steam, gas, electric motor, or internal combustion engine driven compressors. They transmit, compress, or recover gases, such as butane, nitrogen, hydrogen, and natural gas. Gas plant operators operate gas liquefying equipment, operate compressors to control gas pressure in transmission pipelines, and coordinate injections and withdrawals at storage fields.
Many employees in large natural gas processing plants—welders, electricians, instrument repairers, and laborers, for example—perform maintenance activities. In contrast, many small plants are automated and are checked at periodic intervals by maintenance workers or operators, or monitored by instruments that alert operators if trouble develops. In non-automated plants, workers usually combine the skills of both operators and maintenance workers. Gas service dispatchers monitor natural gas lines and send out service trucks and crews to take care of emergencies.
Heating Equipment Technicians
These workers follow blueprints or other specifications to install heating systems. After putting the equipment in place, they install fuel and water supply lines, air ducts and vents, pumps, and other components. They may connect electrical wiring and controls and check the unit for proper operation. To ensure the proper functioning of the system, furnace installers often use combustion test equipment such as carbon dioxide, carbon monoxide, and oxygen testers. After a furnace has been installed, heating equipment technicians often perform routine maintenance and repair work to keep the system operating efficiently.
Natural Gas Appliance Repair Technicians
These technicians visually inspect appliances and check for unusual noises, excessive vibration, fluid leaks, or loose parts to determine why they fail to operate properly. They use service manuals, troubleshooting guides, and experience to diagnose particularly difficult problems. They disassemble the appliance to examine its internal parts for signs of wear or corrosion. Repairers follow wiring diagrams and use testing devices to check electrical systems for shorts and faulty connections. After identifying problems, they replace or repair defective belts, motors, heating elements, switches, gears, or other items. They tighten, align, clean, and lubricate parts as necessary. Repairers use common hand tools, including screwdrivers, wrenches, files, and pliers, as well as soldering guns and special tools designed for particular appliances. When repairing appliances with electronic parts, they may replace circuit boards or other electronic components.
Much of this information comes from the U.S. Department of Labor Occupational Outlook Handbook, which can be accessed via www.bls.gov/ooh.