Natural Gas

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A calorimeter is a device used for measuring the amount of heat involved in a chemical reaction or other process.

Capacity (contractual)

When market participants contract to use specific facilities, they often contract for rights to use a specific amount of capacity on the facilit …

Capacity (natural gas)

In the natural gas industry, capacity measures the capability of a well, processing plant, pipeline, storage facility, or LNG facility to provid …

Capacity payment

A capacity payment is made by a user of an energy asset to the owner of that asset in return for the rights to utilize the asset’s capacity.

Capacity release

In the U.S., holders of firm natural gas pipeline transportation or storage capacity can resell their capacity rights to other market participan …


Monetary capital is the money required to acquire and construct long-term assets necessary to build and reliably operate an electric or natural …

Capital expenditure

Capital expenditures refer to money spent to buy or build assets with a life longer than one year.

Capital structure

Capital structure, also referred to as a company’s debt/equity ratio, describes the amount of debt compared to the amount of equity a company …

Carbon capture and storage

Carbon capture and storage (CCS) is the process of capturing waste carbon dioxide from industrial facilities or power plants, transporting it to …

Carbon negative

Carbon negative refers to an entity or a process that has a net effect of removing greenhouse gases from the atmosphere.

Cathodic protection

Cathodic protection is used to avoid corrosion in buried metal pipes by making the pipe the cathodic side of an electrochemical cell. It is comm …

Certificate case

A certificate case is a regulatory proceeding to evaluate a utility’s application for a Certificate of Public Convenience and Necessity (CPCN) …

Certificate of Public Convenience and Necessity

A Certificate of Public Convenience and Necessity is a permit granted to a utility that authorizes it to a) provide service to a new area, b) en …


A chromatograph is a device that separates and identifies chemical compounds by passing a gas through columns containing beads that selectively …


The citygate is the intersection between the mainline transmission system owned by a natural gas transmission or pipeline company and the local …

Clean air vehicle (CAV)

A CAV is a vehicle that emits significantly fewer pollutants than traditional gasoline- or diesel- powered vehicles.

Climate change

Climate change is defined as a long-term shift in global or regional climate patterns.


A closure is a cap that threads or clamps at the open end of pipe.

CME Group

CME Group is an American global markets company. It is important because it operates many key energy futures markets in the U.S.

Coincident peak demand

Coincident peak demand is the demand of a customer or group of customers at the time of the electric or gas system’s peak demand.