05.07.2009
The quantities of fuel supplied to sea-going ships, whatever their flag and category.
This does not cover amounts supplied for internal transport by water or coastal vessels, nor for air traffic, even international.
Field/well that is only marginally productive or profitable. As technology improves though more marginal fields are able to be developed profitably. In addition, some countries that originally had a price cap on oil or gas are removing the cap to incentivize international oil companies to undertake further exploration activities. A good example of this is India where the price of oil to the local market was capped for many years at approximately $35/bbl. Development of a marginal field often offers a unique set of challenges. In addition premature abandonment of marginal fields is a growing problem in many countries. Marginality is inter alia based on size of field and proximity to market
The change in cost associated with a unit change in quantity supplied or produced. The cost of providing an additional kilowatt-hour of energy output over and above any energy currently being produced. The energy industry refers to the next kilowatt-hour or next unit as the basis for determining this cost. Marginal costs only include immediate expenses required to produce more energy. Long run marginal cost includes capital costs and embedded costs which are not included in marginal costs. Marginal cost is often used interchangeably with incremental cost, but marginal cost can be applied to the average next-unit cost for a large number of additional units, whereas incremental cost applies strictly to the next unit, not to any average of multiple next-units