05.07.2009
An element in a two-part pricing method used in capacity transactions (energy charge is the other element). The capacity tariff is calculated based on the amount of capacity being purchased
A map constructed with continuous lines connecting points of equal value, such as elevation, formation thickness, and rock porosity. Geologists use contour maps of the earth’s surface to make informed guesses as to the likelihood of hydrocarbon traps in an area
The mixing of one producer’s generated supply of electric energy or natural gas with another utility’s generated supply within a transmission system
Gas from working or closed mines that is utilized to make power
A lump of petrified plant matter, frequently spheroid, found in coal seams of the Upper Carboniferous Period (from 325,000,000 to 280,000,000 years ago). Coal balls are important sources of fossil information relating to the forests preceding the Coal Age