Energy Terms


Learn all the terms we use



The amount of electric power delivered or required for which a generator, turbine, transformer, transmission circuit, station, or system is rated by the manufacturer.

Capacity Charge:

An element in a two-part pricing method used in capacity transactions (energy charge is the other element). The capacity charge, sometimes called Demand Charge, is assessed on the amount of capacity being purchased.

Commercial Customer:

The commercial sector is generally defined as non-manufacturing business establishments, including hotels, motels, restaurants, wholesale businesses, retail stores, and health, social, and educational institutions. The utility may classify commercial service as all consumers whose demand or annual use exceeds some specified limit. The limit may be set by the utility based on the rate schedule of the utility.

Compressor Station:

Any permanent combination of facilities which supplies the energy to move gas in transmission lines or into storage by increasing the pressure.


The amount of fuel used by a customer.

Contiguous Facilities:

The buildings or parts of buildings are situated upon the same parcel or contiguous parcels of land and are exclusively occupied and used by customer as a unitary Enterprise at one location and under one management.

Contract Demand Gas (CD Gas):

Gas or transportation entitlement which the utility or a customer has the contractual right to demand on a daily basis from the supplier of the gas. For the transportation of the gas the customer must pay a fixed monthly demand charge regardless of volumes actually taken also a commodity charge related to the volume taken.

Contract Price:

Price of fuels marketed on a contract basis covering a period of 1 or more years. Contract prices reflect market conditions at the time the contract was negotiated and therefore remain constant throughout the life of the contract or are adjusted through escalation clauses. Generally, contract prices do not fluctuate widely.

Cubic Feet:

The most common unit of measurement of gas volume in the U.S. It is the amount of gas required to fill a volume of one cubic foot under stated conditions of temperature, pressure and water vapor.


Reduction or Temporary termination of service by a pipeline of LDC due to a shortage of gas supplies or transmission capability.

Cushion Gas:

Cushion is the total volume of gas in a storage reservoir which will maintain a required minimum rate of delivery during any period of withdrawal- same as Base Pressure Gas.