Capstone Energy Services

Energy Basics

Terms A-Z

Affiliated Marketer

A marketer that is owned either by a distribution or transmission company.


A legal representative of buyers, sellers or shippers of natural gas in negotiation or operations of contractual agreements.


Any marketer, broker or other entity that combines the loads of multiple end-use customers in facilitating the sale and purchase of electric energy, transmission, and other services on behalf of these customers.

Allocation Method

A method of allocating volumes to affected parties when an imbalance occurs.


A process by which capacity available in a pipeline is distributed to parties in the event requests for volume (i.e., nominations) are in excess of the available space. Typically the allocation is based on service type, contract type and a company's tariff provisions.


The process by which supply is assigned to purchasers in accordance with a given priority during periods when total sales requests exceed the seller's total supply.

Allocation-Supplies to End-Use Customers

The amount of gas supply available to the customer in accordance with a given priority during periods of curtailment

Alternate Fuel Capability

The ability to use an alternate fuel whether or not the facilities for such use have actually been installed.

Alternate Fuels

Other fuels that can be substituted for the fuel in use. In the case of natural gas, the most common alternative fuels are distillate fuel oils, residual fuel oils, coal and wood.

American Gas Association (AGA)

Trade group representing natural gas distributors and pipelines.

Ancillary Services

Additional services required for the generation and delivery of electricity. As defined by the Federal Energy Regulatory Commission (FERC), they include: coordination and scheduling services (load following, energy imbalance service, control of transmission congestion); automatic generation control (load frequency control and the economic dispatch of plants); contractual agreements (loss compensation service); and support of system integrity and security (reactive power, or spinning and operating reserves).

Authorized Over-Run

See Over-run, Authorized

Energy Facts

Energy Facts

Natural gas can be used as a raw material in a variety of products, including paint, fertilizer, plastics and medicines.

Natural gas produces fewer emissions than other fossil fuels, with less nitrogen, sulfur, carbon and fine particulates.

Texas produces the largest amount of natural gas in the USA.

The biggest consumer of coal in the US is the electric power sector.

There are 17,658 electric utility generators in the USA.

Energy Delivery Chains

Energy Delivery Chains

Find out more about how your energy is produced and delivered to your business.

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Energy & the Environment

Energy & the Environment

How we assist clients in responding to national environmental concerns.

  • Initiate and manage a "Green" energy procurement program
  • Evaluate national legislative and regulatory initiatives
  • Research state and local energy efficiency programs and incentives
  • Track energy use and related emissions estimate