| Gas Cavern Well (GCW) |
| An underground storage area (hole made underground by drilling salt generally out) used to store liquefied natural gas for future use. |
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| Gas Cycling Scheme |
| A scheme in which part or all of the produced natural gas is reinjected into the reservoir after removal of natural gas liquids. |
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| Gas Field |
| A field containing natural gas but no oil. |
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| Gas Injection |
| The process whereby separated associated gas is pumped back into a reservoir for conservation purposes or to maintain the reservoir pressure. |
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| Gas-Oil |
| A middle-range petroleum distillate. The European designation for No.2 heating oil (or furnace oil) and diesel fuel. |
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| Gas/Oil Ratio |
| The volume of gas at atmospheric pressure produced per unit of oil produced. |
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| Gasification |
| The process of converting solid or liquid fuel into a gaseous fuel. An example is the gasification of coal. |
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| Generation, Electric |
| The act or process of transforming other types of energy into electricity, or the amount of electric energy so produced, usually expresses in kilowatt-hours. |
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| Generation, Electric / Gross |
| The total amount of electrical energy produced by the units in a generating station or system of stations. |
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| Generation, Electric / Net |
| Gross generation, less energy consumed out of gross generation for station use. |
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| Geothermal Energy |
| Energy from natural "hot spots" in the earth's crust, associated with hot, dry rock or large reservoirs of steam or hot water. |
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| Glory Hole |
| A basin created around an underwater drill hole, designed to protect equipment at the top of the hole from scouring by icebergs. |
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| Glut |
| An excess of supply over demand. In a free market system, the glut of a product would cause producers' inventories to increase. Producers would lower the price to bring down inventories until supply and demand reach balance. |
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| Greenhouse Effect |
| The theory that increasing concentrations of carbon dioxide in the atmosphere trap additional heat and moisture and can, in time, create a hot house effect, raising the temperature at the surface of the earth. |
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| Grid |
| A network of elecric power lines and connections. |
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| Ground Elevation |
| The height of land above Sea Level. |
