Energy Choice Education

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Energy Glossary

To make the informed choice, you need to know the lingo. Learn it here.

D

Deregulation / Decontrol

The act of ending federal government control over the wellhead price of new natural gas sold in interstate commerce.

Devonian Shale

Geological formations, typically hundreds of feet thick, that underlie much of the Appalachian Basin. It is known to contain much natural gas, but usually lacks sufficient natural permeability for ordinary production.

Direct Solar Gain

Solar energy collected from the sun (as heat) in a building through windows, walls, skylights, etc. Also known as "solar heat gain."

Distribution Company

Gas Company which obtains at least 90 of its gas operating revenues from the operation of a retail gas distribution and sales to ultimate customers, and which operates no transmission system other than incidental connections within its own system or to the system of another company.

Dth

Dekatherm. A unit of heating value equal to 10 therms or one million Btu’s (1 MMBtu).