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Industry Terms and Definitions

AFUE (Annual Fuel Utilization Efficiency) 
A measure of the efficiency of a gas appliance:  the higher the rating, the more efficient the appliance.

British Thermal Unit (BTU) 
The amount of heat energy needed to raise the temperature of 1 lb. of water 1° F.

100 cubic feet of gas.

Customer Charge 
Basic service charge includes maintenance of gas lines, meters, and other costs such as meter reading and billing.  This charge is billed to the customer whether or not any gas service is used each month and, for Enbridge St. Lawrence Gas customers, includes the distribution delivery charge for the first four therms or less of gas usage.

Ten therms or 1 million Btu’s (MMBT).  One decatherm equals approximately 1,000 cubic feet of gas (MCF).

Degree Day 
A unit measuring the extent to which the daily outdoor average temperature falls below an assumed basis, usually 65° F for heating.  One degree-day is counted for each degree falling below (for heating) the assumed base for each calendar day.

Distribution Delivery 
Local Distribution Company on-system costs from the city gate to the burner tip.  Includes operating, maintenance and administrative costs, as well as a return on investment in capital assets used to distribute gas.

DPA (Deferred Payment Arrangement) 
An arrangement that permits a residential customer to pay overdue bills in installments.

Firm Service
Continuous service by Enbridge St. Lawrence Gas except in instances of "force majeure".

"Force Majeure" 
Circumstances beyond the control of the utility which prevent provision of service.

GAC (Gas Adjustment Clause) 
Also known as GCA, gas cost adjustment.  A method of reflecting changes from month to month in the cost to a utility of gas supplied to its customers.  Elements included in the calculation include changes in the price of gas (commodity) from various pipeline suppliers, currency exchange rates, refunds ordered by FERC, and any reconciliation between GAC revenues and the actual payments utilities made for gas in the prior year.

Gas Interconnection 
Costs incurred for interconnection to upstream pipelines.

Gas Supply 
The cost of the natural gas.

Gas Transportation 
Costs incurred from the well-head to the city gate/metering station between the pipeline and the Local Distribution Company.


Customer must switch to an alternative fuel at times the Company deems necessary. *

LDC (Local Distribution Company) 
A company which obtains the major portion of its gas operating revenues from the operation of a retail gas distribution system, and which operates no transmission system other than incidental connections within its own system or the system of another company.  Enbridge St. Lawrence Gas is an LDC.

LIHEAP (Low Income Home Energy Assistance Program) 
Administered by the NYS Department of Social Services, this is a federally-funded program that provides low-income households with financial assistance to pay heating bills.

Load Balancing 
Costs of gas supplies used to balance loads on a daily basis.

1,000 cubic feet of gas.

The major component of natural gas, it is a colorless, odorless, and non-toxic hydrocarbon (CH4).

Ten therms or 1 million Btu’s.  One decatherm equals approximately 1,000 cubic feet of gas (MCF).

A substance which is added to natural gas to give it a perceptible odor so that its presence can be detected.  The most common odorant is known as Mercaptan.

Peak Day
Customer's highest single daily gas requirement during 9:00 am to 9:00 pm (Central Standard Time).

Peak Hour 
1/24th of the peak day - Customer is allowed a 20% overrun on the peak hour.

Company procures natural gas and distributes to Customer.

Service Regulator 
Installed on the gas service line to control the gas pressure delivered to the customer.

A compilation of a utility’s rates and rules governing its relations with customers.  Changes are subject to review and approval by the NYS Public Service Commission.

100,000 Btu - Approximately 100 cubic feet (CCF) of gas.

Customer procures natural gas from a third party and Company distributes this gas to Customer.

* Customer will guarantee an annual minimum bill that is equal to:
  contract volume x .75 x customer’s average monthly rate (interruptible sales or transportation) for contract year.